Attachment 2. MIL-STD-1791C.pdf
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This is a military technical standard (MIL-STD-1791C) providing design and performance requirements for cargo intended for internal air transport aboard USAF fixed-wing aircraft and Civil Reserve Air Fleet (CRAF) aircraft. The standard establishes general design criteria applicable to the USAF prime mission cargo fleet (C-130, C-17, C-5), tanker cargo systems (KC-10, KC-135), and CRAF long-range international aircraft (B747, DC-10, B767).
The standard covers four major requirement areas: size and dimensional limits, weight distribution and loading constraints, cargo restraint methodology, and air transport environmental considerations. Size requirements address cargo compartment clearances, projection limits during ramp loading, ramp cresting angles, and emergency access provisions for aircraft crew. Weight requirements include compartment limits, concentrated floor loads, longitudinal and lateral running loads, axle/wheel loads for rolling stock, roller conveyor limits for palletized cargo, and vehicle suspension load factors. Restraint requirements specify static and dynamic load factors (ranging from 1.5G to 4.5G depending on direction and aircraft type) that cargo must withstand, along with mandatory tiedown provision design standards per MIL-STD-209. Environmental requirements address shock and vibration tolerance, rapid decompression (8.3 psi differential), explosive vapor exposure on tanker aircraft, extreme temperature ranges (-40°F to 120°F), and EMI/EMC compliance per MIL-STD-461 and MIL-STD-464. The standard also details special consideration cargo requirements for hazardous materials, venting systems, electrical interfaces, bulk fluid tanks, and personnel-occupied systems. Appendix A provides supplemental guidance on cargo types (rolling stock, palletized, bulk), loading procedures, shoring requirements, winching operations, and combat offload procedures, while Appendix B contains aircraft-specific structural limits and dimensional data for each cargo aircraft type.
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Text version
INCH-POUND
MIL-STD-1791C
23 October 2017
SUPERSEDING
MIL-STD-1791B
02 December 2014
DEPARTMENT OF DEFENSE
INTERFACE STANDARD
DESIGNING FOR INTERNAL AERIAL DELIVERY
IN FIXED WING AIRCRAFT
AMSC N/A FSC 1510
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Downloaded from http://www.everyspec.com ii
FOREWORD
1. This standard is approved for use by all Departments and Agencies of the Department of Defense.
2. This standard establishes general design and performance requirements that items have to comply with in order to be safely transported onboard USAF fixed wing cargo aircraft. The standard covers the USAF prime mission cargo aircraft (e.g., C-130E/H/J, C-130J-30, C-17, and C-5), cargo carrying systems of the tanker fleet (KC-10 and KC-135) as well as the cargo aircraft in the long-range, international segment of the Civil Reserve Air Fleet (CRAF) (e.g., B747, DC- 10, and B767). The structural and dimensional criteria for other cargo aircraft are documented in specific manuals for each aircraft.
3. The definition of an air transportability problem item and what does or does not need to be certified for air transport is provided in 1.3.
4. General and detailed requirements with associated verification criteria are found in sections 4 and 5. Section 6 provides guidance for applying the requirements.
5. For Personnel-Occupied cargo, such as personnel modules and seat pallets, many interface requirements are contained in this document. Due to safety of personnel, the approval authority rests within the individual aircraft offices and the USAF Airworthiness Authority (see A.8.4).
6. For patient care equipment, such as litters and instruments, Safe-to-Fly requirements can be obtained from Headquarters Air Mobility Command’s Medical Modernization Division (HQ AMC/SGR), Scott AFB, IL and Aeromedical Systems Branch’s (AFLCMC/WNUP) Aeromedical Test Laboratory (ATL), Wright-Patterson AFB, OH. This document can provide many of the aircraft interface requirements.
7. This document can be used for guidance when personnel module and patient care equipment are interfaced with aircraft cargo systems.
8. Appendix A explains how the requirements may apply to four common types of cargo and how those types of cargo are air transported. It also includes lessons learned and describes operations common to the standard mission: load planning, loading, restraining cargo, flight, jettison, and combat offloading. Appendix A also gives an overview of the 463L air cargo system.
Appendix B provides detailed data on specific aircraft limits to supplement the requirements stated in sections 4 and 5. Data on military aircraft can also be found in that aircraft's Technical Order (T.O.) 1C-XXX-9 cargo loading manual. NOTE: Information on CRAF aircraft are not shown in this document but can be obtained by contacting the Air Transportability Test Loading Activity
(ATTLA).
9. Comments, suggestions, or questions on this document should be addressed to AFLCMC/EZFC (ATTN: ATTLA), Building 28, 2145 Monahan Way, Wright-Patterson Air Force Base OH, 45433-7017 or emailed to Engineering.Standards@us.af.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST online database at https://assist.dla.mil.
iii
SUMMARY OF CHANGE MODIFICATIONS
1. The following modifications were made to this standard.
PARAGRAPH MODIFICATION
1.3 Added
1.3.1 Added
1.3.2 Added
2.3 Added
3 Added
4.3.8.1 Added
4.3.8.2 Added
4.3.8.3 Added
5.3.1.2 Added
5.3.2.1 Added
5.3.2.2 Added
5.3.2.3 Added
5.3.2.4 Added
5.3.2.5 Added
5.3.2.6 Added
5.3.2.7 Added
5.3.2.8 Added
5.3.2.9 Added
5.3.2.10 Added
5.3.2.11 Added
5.3.2.12 Added
5.3.2.14 Added
5.3.2.15 Added
5.3.3.1 Added
5.3.3.5 Added
5.3.4.1 Added
5.3.4.2 Added
5.3.4.3 Added
5.3.4.4 Added
iv
5.3.4.5 Added
5.3.5.1 Added
5.3.5.1.1 Added
5.3.5.2 Added
5.3.5.2.1 Added
5.3.5.3 Added
5.3.5.3.1 Added
5.3.5.4 Added
5.3.5.4.1 Added
5.3.5.5 Added
5.3.5.5.1 Added
5.3.6.2.1 Added
5.3.6.4.1 Added
5.3.6.5 Added
6.1 Added
6.4.3 Added
A.3.3.2.2 Added A.3.4.1 Added A.3.4.5 Added A.3.4.13.1 Added A.4.1.3 Added A.4.1.6 Added A.4.1.8 Added A.4.2.1 Added A.4.2.2 Added A.4.3.1 Added A.4.3.2 Added A.4.3.3 Added A.4.3.3.1 Added A.4.3.3.2 Added A.4.3.3.3 Added A.4.3.3.3.1 Added A.4.3.3.3.2 Added v
A.4.3.3.3.3 Added A.4.3.3.4 Added A.4.3.3.5 Added A.4.3.3.6 Added A.6.4 Added A.6.10 Added A.7.1 Added A.7.1.1 Added A.7.2.1 Added A.9.6.1 Added A.9.6.3.2 Added A.9.6.4 Added B.3.2.1 Added B.3.2.1.1 Added B.3.4.1 Added B.3.4.1.1 Added B.3.4.2 Added B.3.4.3 Added B.3.4.4 Added B.3.4.5 Added B.4.1.1.1 Added B.4.1.1.3 Added B.4.2.1.3 Added B.4.2.2.2.1 Added B.4.4.3 Added B.4.4.4 Added B.5.2.1.1 Added B.5.2.1.2 Added B.5.2.1.3 Added B.5.4.1 Added B.5.4.1.1 Added B.5.4.1.2 Added B.5.4.1.3 Added vi
B.5.4.1.4 Added B.5.4.1.5 Added B.5.4.2 Added B.5.4.2.1 Added B.5.4.2.2 Added B.5.4.2.3 Added B.5.4.2.4 Added B.5.4.3 Added B.6.2.1.1 Added
FIGURES MODIFICATION
FIGURE 5 Changed FIGURE A-2 Changed FIGURE A-23 Changed FIGURE A-27 Changed FIGURE A-28 Changed FIGURE A-29 Changed FIGURE A-32 Changed FIGURE A-33 Changed FIGURE A-34 Changed FIGURE A-35 Changed FIGURE A-40 Changed FIGURE B-7 Changed FIGURE B-8 Changed FIGURE B-9 Changed FIGURE B-32 Changed FIGURE B-33 Changed FIGURE B-35 Changed FIGURE B-37 Changed FIGURE B-39 Changed FIGURE B-41 Changed FIGURE B-43 Changed FIGURE B-52 Changed FIGURE B-53 Changed vii
FIGURES MODIFICATION
FIGURE B-57 Changed FIGURE B-59 Changed FIGURE B-60 Changed FIGURE B-61 Changed FIGURE B-62 Changed FIGURE B-64 Changed FIGURE B-65 Changed FIGURE B-66 Changed FIGURE B-77 Changed FIGURE B-90 Changed FIGURE B-91 Changed FIGURE B-92 Changed FIGURE B-94 Changed FIGURE B-101 Changed FIGURE B-114 Changed FIGURE B-115 Changed FIGURE B-116 Changed FIGURE B-117 Changed FIGURE B-118 Changed
TABLES MODIFICATION
TABLE I Changed TABLE III Changed TABLE IV Changed TABLE XVII Changed TABLE A-I Changed TABLE B-XIV Changed TABLE B-XIX Changed TABLE B-XVI Changed TABLE B-XXI Changed viii
TABLE OF CONTENTS
1. SCOPE
1.1 Purpose
1.2 General
1.2.1 Appendices
1.3 Applicability
1.3.1 Air transportability problem items
1.3.2 Internal air transport certification
1.3.3 Certification not required
2. APPLICABLE DOCUMENTS
2.1 General
2.2 Government documents
2.2.1 Specifications, standards, and handbooks
2.2.2 Other Government documents, drawings, and publications
2.3 Order of precedence
3. DEFINITIONS
4. GENERAL REQUIREMENTS
4.1 Scope of general requirements
4.2 Verification methods
4.3 Requirements
4.3.5 Restraint requirements
4.3.6 Markings
4.3.9 Special loading, unloading, and flight procedures
5. DETAILED REQUIREMENTS
5.1 Scope of detailed requirements
5.2 Air transport requirements and verification methods
5.2.1 Requirements layout
5.2.2 Verification methods
5.3 Detailed requirements
5.3.1 Size requirements
5.3.2 Weight limits
5.3.3 Restraint requirements
5.3.4 Markings
5.3.5 Air transport environment
5.3.6 Special consideration cargo
5.3.7 Special loading, unloading, and flight procedures
6. NOTES
6.1 Intended use
6.2 Acquisition requirements
6.3 Tailoring instructions
6.3.1 Applicability of requirements
6.3.2 Example
6.4 Air transport certification process
6.4.2 Other certifications
ix
6.5 Subject term (key word) listing
6.6 Changes from the previous issue
A.1 SCOPE
A.2 DEFINITIONS
A.3 SIZE AND WEIGHT BY CARGO TYPE
A.3.1 Size A.3.1.1 Size requirements A.3.2 Weight limits A.3.3. Rolling stock A.3.4 Palletized cargo A.3.4.6 Rail systems A.3.5 Bulk cargo
A.4 RESTRAINING CARGO
A.4.1 General A.4.1.3 Tiedown devices A.4.2 Restraint principles A.4.3 Tiedown pattern development A.4.4 Bulk cargo
A.5 MARKINGS
A.6 SHORING
A.6.1 Approach shoring A.6.2 Pedestal shoring A.6.3 Cresting shoring A.6.5 Rolling shoring A.6.6 Parking shoring A.6.7 Sleeper shoring A.6.8 Support shoring A.6.9 Bridge shoring A.6.10 Protection shoring
A.7 AIR TRANSPORT ENVIRONMENT
A.7.1 Shock and vibration A.7.2 Pressure change A.7.3 Temperature change A.7.4 Explosive atmosphere A.7.5 Electromagnetic environment A.7.6 Secondary structural considerations
A.8 SPECIAL CONSIDERATION CARGO
A.8.1 Hazardous material A.8.2 Aircraft electrical and data interface A.8.3 Bulk fluid tanks A.8.4 Personnel occupied systems
A.9 SPECIAL LOADING AND FLIGHT PROCEDURES
A.9.1 Special tools and transport equipment A.9.2 Material handling equipment (MHE) x
A.9.3 Self-adjustment A.9.4 Lowering tire pressure A.9.5 Straight-in loading A.9.6 Winching A.9.7 Secondary cargo
A.10 LOAD PLANNING
A.10.1 Access to aircraft systems A.10.2 Aircraft CG limits A.10.3 Aircraft cargo payload A.10.4 Availability of tiedowns A.10.5 Compartment size limit A.10.6 Compartment weight limits A.10.7 Interference with other cargo A.10.8 Ramp contact A.10.9 Sensitive areas
A.11 CARGO JETTISON
A.11.1 General A.11.2 How to read a tip-off curve
B.1 SCOPE
B.1.1 Scope B.1.2 Applicability B.1.3 Organization B.1.4 Order of precedence
B.2 DEFINITIONS
B.3 C-5 GALAXY
B.3.1 Geometry B.3.2 Strength B.3.3 Restraint B.3.3.3 Lock layout B.3.4 Additional information
B.4 C-17 GLOBEMASTER III
B.4.1 Geometry B.4.2 Strength B.4.3 Restraint B.4.4 Additional information B.5.1 Geometry B.5.2 Strength B.5.2.2 Ramp B.5.3 Restraint B.5.4 Additional information
B.6 KC-10 EXTENDER
B.6.1 Geometry B.6.1.3 Cargo door B.6.2 Strength xi
B.6.3 Restraint B.6.4 Additional information
B.7 KC-135 STRATOTANKER
B.7.1 Geometry B.7.2 Strength B.7.3 Restraint B.7.4 Additional information
B.8 CIVIL RESERVE AIR FLEET (CRAF)
TABLE OF FIGURES
FIGURE 1. Maximum projected height FIGURE 2. Tiedown rings FIGURE 3. Example tiedown provisions FIGURE 4. Pallet/roller interface FIGURE 5. Pallet rail exterior profile FIGURE 6. Example system FIGURE 7. ATTLA certification process FIGURE A-1. 17 Degree angle FIGURE A-2. Problematic areas for cresting FIGURE A-3. Loading issues FIGURE A-4. Tire contact area FIGURE A-5. Jackstand support FIGURE A-6. Single and triple pallet loads FIGURE A-7. Top and side netting FIGURE A-8. Pallet and side rail FIGURE A-9. Pallet size and weight limits with net restraint FIGURE A-10. Palletized cargo restrained to aircraft floor rings FIGURE A-11. Logistics rail/roller interface with type V airdrop platform FIGURE A-12. Aircraft rail and pallet side rail interface FIGURE A-13. Pallet locked into aircraft rails FIGURE A-14. Palletized cargo height FIGURE A-15. Non-uniform pallet loading FIGURE A-16. Pallet/roller weight distribution FIGURE A-17. Standard pallets and containers FIGURE A-18. Examples of bulk cargo FIGURE A-19. Projection of bulk cargo FIGURE A-20. Floor loading calculation FIGURE A-21. Forklift loading bulk cargo FIGURE A-22. Restraint for various situations FIGURE A-23. Tiedown devices FIGURE A-24. Applied force curves FIGURE A-25. Chain angle 1 FIGURE A-26. Chain angle 2 FIGURE A-27. Tiedown angles 1 FIGURE A-28. Tiedown angles 2 FIGURE A-29. Chain gate and chain bridle FIGURE A-30. CG location for effective restraint FIGURE A-31. Sample tiedown pattern FIGURE A-32. Dimensions for tiedown analysis xii
FIGURE A-33. Multiple chain restraint FIGURE A-34. Example complex tiedown FIGURE A-35. Unsatisfactory bulk cargo restraint FIGURE A-36. Vertical cargo shift FIGURE A-37. Longitudinal/lateral cargo shift FIGURE A-38. Sample approach shoring stack FIGURE A-39. C-5 approach shoring ramp toe support FIGURE A-40. Pedestal shoring FIGURE A-41. Cresting shoring FIGURE A-42. Shoring to spread weight FIGURE A-43. Parking shoring FIGURE A-44. Shoring for large gapped tires FIGURE A-45. Sleeper shoring FIGURE A-46. Bridge shoring FIGURE A-47. Vibration spectrum FIGURE A-48. Potential problem areas FIGURE A-49. Winching cargo FIGURE A-50. Winching with snatch blocks FIGURE A-51. Self-winching using snatch blocks FIGURE A-52. Multiple loads in aircraft FIGURE A-53. Allowable CG locations FIGURE A-54. Compartment limit chart FIGURE A-55. Ramp cargo placement FIGURE A-56. Tip-off curve FIGURE B-1. C-5 Aircraft FIGURE B-2. Cargo compartment envelope FIGURE B-3. Forward cargo opening dimension FIGURE B-4. Aft cargo opening dimensions FIGURE B-5. Allowable cargo height FIGURE B-6. Airplane kneeling loading position (on/off loading) FIGURE B-7. Crated cargo projection limits (forward and aft end loading-palletized) FIGURE B-8. Forward and aft end loading – vehicle projection limits FIGURE B-9. Forward and aft end loading – vehicle projection FIGURE B-10. Forward and aft end loading – vehicle projection limits FIGURE B-11. Forward and aft end loading – vehicle projection limits FIGURE B-12. Forward and aft end loading – vehicle projection limits FIGURE B-13. Forward and aft end loading – vehicle projection limits FIGURE B-14. Forward and aft end loading – vehicle projection limits FIGURE B-15. Forward and aft end loading – vehicle projection limits FIGURE B-16. Forward and aft end loading – vehicle projection limits FIGURE B-17. Forward and aft end loading – vehicle projection limits FIGURE B-18. Forward and aft end loading – vehicle projection limits FIGURE B-19. Forward and aft end loading – vehicle projection limits FIGURE B-20. Forward and aft end loading – vehicle projection limits FIGURE B-21. Forward and aft end loading – vehicle projection limits FIGURE B-22. Forward and aft ramp crest limits FIGURE B-23. Forward and aft ramp crest limits FIGURE B-24. Forward and aft ramp crest limits FIGURE B-25. Parking overhang limits FIGURE B-26. Forward and aft cargo ramp vehicle overhang limits FIGURE B-27. Forward and aft cargo ramp vehicle overhang limits xiii
FIGURE B-28. Parking overhang limits FIGURE B-29. C-5 minimum approach shoring width under forward ramp toes FIGURE B-30. Portable loading ramp extension FIGURE B-31. Portable loading ramp extension assembly sequence FIGURE B-32. Cargo floor loading limitations FIGURE B-33. Cargo maximum allowable lateral CG location FIGURE B-34. Concentrated cargo maximum allowable floor loads FIGURE B-35. Calculating on/off load limits for tires FIGURE B-36. Calculating flight load limits for tires FIGURE B-37. Calculating flight load limits for hard rubber or steel wheels FIGURE B-38. Calculating load limits for track pad FIGURE B-39. C-5 roller system weight limitations FIGURE B-40. Forward and aft cargo ramp on/off loading limitations FIGURE B-41. Cargo floor tiedown rings and ABS receptacles FIGURE B-42. Cargo floor configuration (logistics cargo) FIGURE B-43. Cargo floor configuration (ADS cargo) FIGURE B-44. Inboard and outboard restraint rail mechanism detent locations FIGURE B-45. C-5 overboard vents FIGURE B-46. Cargo compartment electrical outlets FIGURE B-47. C-17 aircraft FIGURE B-48. Cargo compartment loading envelope FIGURE B-49. Electrical bracket FIGURE B-50. C-17 straight-in loading envelope, end view FIGURE B-51. C-17 straight-in loading envelope, side view FIGURE B-52. Cargo projection limits FIGURE B-53. Vehicle dimensional limits FIGURE B-54. Vehicle projection limits FIGURE B-55. Vehicle ramp crest limit FIGURE B-56. Vehicle ramp crest clearance limit FIGURE B-57. Parking overhang limits FIGURE B-58. Allowable in-flight ramp loadable height FIGURE B-59. C-17 minimum approach shoring width under ramp toes FIGURE B-60. Floor limitations FIGURE B-61. Concentrated floor loads – calculations FIGURE B-62. C-17 high pressure pneumatic tire limitations FIGURE B-63. Cargo weight loading envelope (non-E/R) FIGURE B-64. Cargo weight loading envelope (E/R) FIGURE B-65. Tracked vehicle articulated suspension FIGURE B-66. C-17 Rollers and limitations FIGURE B-67. C-17 ADS system FIGURE B-68. C-17 logistic rail system FIGURE B-69. Ramp toes FIGURE B-70. Allowable in-flight ramp payload FIGURE B-71. Ramp Lifting Limits FIGURE B-72. C-17 ramp crest teeter limitations FIGURE B-73. C-17 ramp and ramp toes configured for dual row logistics system loading FIGURE B-74. Cargo tiedown rings/location FIGURE B-75. Cargo compartment vents FIGURE B-76. Cargo compartment electrical receptacles FIGURE B-77. C-17 tip off curve FIGURE B-78. C-17 aeromedical litter stations xiv
FIGURE B-79. C-130 aircraft FIGURE B-80.a C-130 E/H cargo compartment dimensions FIGURE B-80.b C-130J and C-130J-30 cargo compartment dimensions FIGURE B-81. C-130 safety aisle (all variants) FIGURE B-82.a C-130A thru H cargo compartment dimensions FIGURE B-82.b. C-130J and C-130J-30 cargo compartment dimensions FIGURE B-83. C-130E/H cargo compartments FIGURE B-84. Overhang and projection limits (cargo) FIGURE B-85. Overhang and projection limits (vehicle) FIGURE B-86. Overhang and projection limits (vehicle) FIGURE B-87. Overhang and projection limits (vehicle) FIGURE B-88. C-130 ramp loadable height FIGURE B-89 C-130 E/H compartments and pallet centroids FIGURE B-90. Floor loading capacity – concentrated or pneumatic tire loads FIGURE B-91. Treadways FIGURE B-92. C-130J ground and flight limits FIGURE B-93. C-130J and -30 compartments, treadways and pallet centroids FIGURE B-94. C-130J-30 ground and flight limits FIGURE B-95. Cargo door and ramp FIGURE B-96. Auxiliary truck loading ramp loads FIGURE B-97. Ramp height FIGURE B-98. Cargo tiedown, seat, and litter fitting locations FIGURE B-99. C-130J tiedown fittings locations FIGURE B-100. C-130J-30 tiedown fittings locations FIGURE B-101. Minimum vertical restraint requirements FIGURE B-102. C-130E/H electrical outlets FIGURE B-103. C-130 tip off or jettison height limit curve (all variants) FIGURE B-104. Litter arrangement FIGURE B-105. KC-10 loading envelope FIGURE B-106. Pallet contours and aisle configurations FIGURE B-107. Cargo compartment envelope FIGURE B-108. Mixed cargo/personnel configuration FIGURE B-109. Mixed cargo/personnel configuration FIGURE B-110. Mixed cargo/personnel configuration FIGURE B-111. Mixed cargo/personnel configuration FIGURE B-112. Cargo door FIGURE B-113. All-cargo configuration FIGURE B-114. Pallet load limitations FIGURE B-115. Loading data – 25 pallet all-cargo configuration FIGURE B-116. Loading data – lateral loading (left side of aircraft) FIGURE B-117. Concentrated load limitations – 25-pallet all-cargo configuration FIGURE B-118. Concentrated load limitations – lateral loading (left side of aircraft) FIGURE B-119. Vehicle axle weight limitations FIGURE B-120. A-7000 vertical tiedown allowables FIGURE B-121. HCU-6/E pallet ring vertical allowables FIGURE B-122. Cargo compartment cryogenic vent FIGURE B-123. Cargo compartment electrical outlets FIGURE B-124. Winching arrangements FIGURE B-125. Maximum capability of cargo winch on sloped aircraft floor FIGURE B-126. Aircraft diagram (typical) FIGURE B-127. KC-135 R/T cargo compartment xv
FIGURE B-128. Cargo roller handling system (six pallets installed) FIGURE B-129. Cargo contour FIGURE B-130. KC-135 loading envelope FIGURE B-131. Large area loads (greater than 1.5 square feet) FIGURE B-132. Allowable axle loads for pneumatic tires FIGURE B-133. Allowable load for hard rubber and steel wheels FIGURE B-134. KC-135 pallet CG requirements FIGURE B-135. Installation of tiedown shackles 5,000 and 10,000 pound capacity FIGURE B-136. Allowable tiedown ring load rating (per ring) FIGURE B-137. KC-135 cryogenic vents
LIST OF TABLES
TABLE I. Cargo compartment design box TABLE II. Pallet and platform limits TABLE III. Aircraft limits TABLE IV. Restraint load factors TABLE V. Restraint velocity changes TABLE VI. EMI/EMC test requirements TABLE VII. Fuel in tank guidelines TABLE VIII. Requirement applicability by loading method TABLE IX. Requirement applicability based on typical loads TABLE A-I. Summary restraint levels for cargo TABLE A-II. Example dimensions and angles TABLE A-III. Example forces TABLE A-IV. Example load cases TABLE A-V. Example load cases TABLE A-VI. Shoring minimum size TABLE A-VII. Winch cable force, various surfaces TABLE B-I. Allowable Cargo Floor Load TABLE B-II. Vertical restraint – tiedown rings TABLE B-III. Electrical outlets and power supply TABLE B-IV. Cargo projection limits inboard of X = ± 82 TABLE B-V. Cargo projection limits inboard of X = ± 82 TABLE B-VI. Cargo projection limits outboard of X = ± 82 TABLE B-VII. Cargo projection limits outboard of X = ± 82 TABLE B-VIII. Vehicle projection limits inboard of X = ± 82 – wheelbase less than 257 inches.
TABLE B-IX. Vehicle projection limits inboard of X = ± 82 – wheelbase 257 to 339 inches TABLE B-X. Vehicle projection limits inboard of X = ± 82 – wheelbase 340 inches + TABLE B-XI. Vehicle projection limits outboard of X = ± 82 – wheelbase less than 257 inches.
TABLE B-XII. Vehicle projection limits outboard of X = ± 82 – wheelbase 257 to 339 inches. 255 TABLE B-XIII. Vehicle projection limits outboard of X = ± 82 – wheelbase 340 inches + TABLE B-XIV. Vehicle ramp crest clearance limits TABLE B-XV. Vehicle overhang limits – ramp and ground contact TABLE B-XVI. Steel and hard rubber wheel – allowable floor load limitations TABLE B-XVII. Ramp toe loading limitation chart TABLE B-XVIII. ADS ramp platform weight limitations TABLE B-XIX. ADS pallet weight limitations xvi
TABLE B-XX. Tiedown ring ratings TABLE B-XXI. Floor loading capacity (solid tires) TABLE B-XXII. Palletized cargo weight limitations for all C-130s TABLE B-XXIII. KC-135 Compartment Structural Limits
1. SCOPE
1.1 Purpose.
This standard provides design and performance requirements to assure the airworthiness of USAF fixed wing aircraft during safe and effective cargo transportation missions. It presents design requirements and operating limits from the basic aircraft loading manuals and technical publications and is supplemented by additional useful air transport data.
The process for approval or certification of cargo for air transport in USAF fixed wing aircraft is described in 6.4. This section presents the format for submitting a request for certification and provides examples of the type of data to submit.
1.2 General.
This standard covers general design and performance requirements of U.S. Government developed or purchased off-the-shelf cargo for internal air transport in military prime mission cargo aircraft and the long-range, international segment of the Civil Reserve Air Fleet (CRAF). The complete air transportability requirements for an item of equipment not specified herein will be specified in the individual equipment specification. This standard also describes the procedure to certify outsized or unusual cargo for air transport.
1.2.1 Appendices.
The appendices to this standard explain air transport concepts and detailed aircraft systems and limits. Basic air transport concepts and common types of cargo and how the requirements apply are described in Appendix A. Detailed aircraft information for C-130 (and C-130J-30), C-17, C-5, KC-10, and KC-135 are given in Appendix B. Details on CRAF aircraft can be obtained through AMC/A3B; ATTLA can review items for transport on CRAF. However, final approval of the airlift of the item ultimately rests with the individual contractor. Information on other aircraft, such as C-21 and C-40, are not shown in this document because the Air Transportability and Test Loading Activity (ATTLA) does not certify these aircraft.
1.3 Applicability.
The requirements and tests contained in this standard apply to the internal air transportability aspects of all items intended for aerial delivery in CRAF or USAF aircraft. They represent the minimum acceptable transportability features. When it is known that the equipment requires features that are more restrictive than those stated herein, those features should be specified in the individual equipment specification.
1.3.1 Air transportability problem items.
An air transportability problem item is any item of equipment in its proposed shipping configuration which may be denied transport aboard US Air Force prime mission cargo aircraft or the cargo carrying segment of the Civil Reserve Air Fleet (CRAF). The item may be refused due to excessive size, weight, fragile or hazardous characteristics, lack of adequate means for handling, restraint, or a requirement for special support equipment. An item is considered a potential problem item when its design requirement includes transportability in such aircraft and the item exceeds any one of the general conditions imposed by paragraphs E1.1.14.3, E1.1.14.4, and E1.1.14.5 in DODI 4540.07.
The potential problem item criteria requiring cargo to be evaluated are summarized and clarified as follows:
Length greater than 240 inches (20 feet).
a. Width greater than 96 inches (8 feet).
a. Height greater than 96 inches (8 feet).
b. Weight greater than 10,000 pounds.
c. Weight distribution greater than aircraft limits, nominally based on the C-130:
1. 5,000 pound axle.
2. 2,500 pound wheel.
3. 1,600 pounds per linear foot running load.
4. 50 pounds per square inch of floor contact pressure.
d. Requires special handing for one or more of the following reasons:
1. Item characteristics are such that the aircraft or Air Force materials handling environment poses a problem.
2. Requires usage of aircraft electrical power or electronic system.
3. Cargo has electronic components that are powered on (electronically active) or are used while in the aircraft other than during on/offload from/to the ground.
4. Susceptible to potential aircraft environment: high altitude, rapid decompression, electromagnetic environment, vibration, or extreme temperature.
5. Susceptibility to explosive atmosphere environment (specific tanker aircraft and aircraft with midair refueling capability only).
6. Cargo item requires maintenance of special in-flight conditions such as venting of hazardous materials, auxiliary power or controlled cargo compartment temperatures.
7. Inadequate ramp clearance for ramp inclines of 15 degrees.
e. Requires special loading/unloading procedures for any other reason.
1.3.2 Internal air transport certification.
Any item to be airlifted by USAF cargo transport aircraft, categorized as an air transportability problem item must be reviewed by ATTLA. In many cases, this results in an internal air transport certification being issued. The federal sponsor (office, agency, or person that represents the U.S.
Government and develops, procures, owns, or transports the item) must send a memo requesting that ATTLA approve the item for airlift aboard USAF cargo aircraft.
The air transport certification process is laid out with a detailed description in documents posted to the ATTLA website at https://intelshare.intelink.gov/sites/attla/. Those who are unable to access the site may request them by contacting ATTLA.
A simplified description of the process is in 6.4.
1.3.3 Certification not required.
Cargo that is not an air transportability problem item (does not meet any of the criteria stated in
1.3.1 above) will not require certification and can be transported with minimal risk at the discretion of the aircrew and their applicable MAJCOM.
2. APPLICABLE DOCUMENTS
2.1 General.
The documents listed in this section are specified in sections 3, 4, or 5 of this standard. This section does not include documents cited in other sections of this standard or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this standard, whether or not they are listed.
2.2 Government documents.
2.2.1 Specifications, standards, and handbooks.
The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.
INTERNATIONAL STANDARDIZATION AGREEMENTS
NATO STANAG 3548 Tie-Down Fittings on Air Transported and Air-Dropped Equipment and Cargo Carried Internally by Fixed Wing Aircraft
DEPARTMENT OF DEFENSE SPECIFICATIONS
MIL-DTL-6458 Chain Assemblies, Single Leg, Aircraft Cargo Tiedown MIL-DTL-25959 Tiedown, Tensioners, Cargo, Aircraft MIL-PRF-27260 Tiedown, Cargo, Aircraft, CGU-1/B MIL-DTL-27443 Pallets, Cargo, Aircraft, Type HCU-6/E, HCU-12/E MIL-N-27444 Net, Cargo Tiedown, Pallets HCU-7/E, HCU-15/C, HCU-11/C, and HCU-16/C
DEPARTMENT OF DEFENSE STANDARDS
MIL-STD-129 Military Marking for Shipment and Storage MIL-STD-130 Identification Marking of U.S. Military Property MIL-STD-209 Lifting and Tiedown Provisions MIL-STD-461 Requirements for the Control of Electromagnetic Interference
Characteristics of Subsystems and Equipment MIL-STD-464 Electromagnetic Environmental Effects Requirements for
Systems MIL-STD-648 Specialized Shipping Containers MIL-STD-810 Environmental Engineering Considerations and Laboratory Tests
DEPARTMENT OF DEFENSE HANDBOOKS
MIL-HDBK-516 Airworthiness Certification Criteria
(Copies of these documents are available online at http://quicksearch.dla.mil.)
DRAWINGS - AIR FORCE
7133042 Extrusion, Pallet Rail - Airborne Cargo
(Copies of these drawings are available online at https://jedmics.af.mil/webjedmics/index.jsp, for users with approved access rights granted through the Joint Engineering Data Management Information and Control System (JEDMICS). Users not located on a *.mil network may contact the JEDMICS Help Desk via email at JEDMICS@robins.af.mil for instructions on obtaining and completing the necessary forms.)
2.2.2 Other Government documents, drawings, and publications.
The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.
AIR FORCE INSTRUCTION (AFI)
AFI 11-202, Volume 3 Flying Operations, General Flight Rules AFI 91-107 Safety, Design, Evaluation, Troubleshooting, and Maintenance
Criteria for Nuclear Weapon Systems
AIR FORCE PAMPHLET (AFPAM)
AFPAM 10-1403 Operations, Air Mobility Planning Factors
AIR MOBILITY COMMAND PAMPHLET (AMCPAM)
AMCPAM 24-2 Transportation, Civil Reserve Air Fleet Load Planning Guide, Vol 1-10
(Copies of these documents are available online at http://www.e-publishing.af.mil.)
FIELD MANUALS (FMs) / TECHNICAL ORDERS (TOs)
TO 1C-130J-1 Flight Manual -- USAF Series 1C-130J Aircraft TO 1C-XXX-9 Cargo Loading Manual (XXX signifies A/C type number designation)
(For specific documents, search the Enhanced Technical Information Management System, ETIMS, online through the Air Force Portal https://www.my.af.mil/etims/ETIMS/index.jsp.)
Contractors can obtain T.O.s through their government contract monitor or from Oklahoma City Air Logistics Center, Tinker AFB; (405) 736-5468 or DSN 336-5468; fax (405) 736-5013 or DSN 336-5013.
JOINT REGULATIONS
AFI 24-203 Preparation and Movement of Air Force Cargo
AFMAN 24-204(I)/ TM38-250/
NAVSUP PUB 505/ MCO P4030.19/
DLAM 4145.3
Preparation of Hazardous Materials for Military Air Shipment
AFLCR 800-29/AFSCR 800-
29/DARCOM-R 700-
103/NAVMATINST 4030.11A/
Policies and Procedures for Hazardous Materials
DLAR 4145.37 Package Certification DoDI 4540.07 Operation of DoD Engineering for Transportability and Deployability Program
TECHNICAL REPORTS
Air Force Flight Dynamics Laboratory Technical Report 74-144 (AD B003792), C-5A Cargo Deck Low-Frequency Vibration Environment, February 1975 (limited access).
ASD-TR-76-30, “Cargo Aircraft and Spacecraft Forward Restraint Criteria”, Aeronautical Systems Division (now Air Force Life Cycle Management Center), Wright-Patterson AFB, OH, Dec 1977.
DTIC Report Number, AD-A179 084, U.S. Army Test and Evaluation Command Report Number: Test Operations Procedure 1-1-010, “Vehicle Test Course Severity:”, U.S. Army Combat Systems Test Activity/STECS-AD, Aberdeen proving Grounds, MD, 6 April 1987.
DTIC Report Number, AD A043447, U.S. Army Engineer Waterways, Experiment Station, Instruction Report S-77-1, Procedures for Development of CBR Design Curves, A. Taboza Pereira, June 1977.
The Goodyear Tire and Rubber Company, Truck Tire Types and Road Contact Pressures, Pedro Yap, Senior Design Engineer, June 1989.
Boeing Airport Compatibility, Calculating Tire Contact Area, 4 February 2014.
U.S. Army Test and Evaluation Command Report Number: Test Operations Procedure TOP 1-1-011, “Vehicle Test Facilities at Aberdeen Proving Ground”, U.S. Army Combat Systems Test Activity/STEAP-MT-M, Aberdeen Proving Grounds, MD, 6 July 1981.
Department of Defense publications are available online at http://www.dtic.mil/whs/directives; Air Force publications at http://www.e-publishing.af.mil; other departments and agencies at http://www.dtic.mil/whs/directives/links.html, except where noted.
(Copies of other Government documents required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.)
2.3 Order of precedence.
Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, unless otherwise stated, the references take precedence. This document does not supersede applicable laws and regulations unless a specific exemption has been obtained.
3. DEFINITIONS
463L Air cargo system The designation for the USAF system of materials handling equipment.
The 463L system consists of separate but interdependent equipment families: the terminal family, cargo preparation family (including the “463L pallet”), ground handling family, and aircraft systems family. A complete description can be found in Appendix A.
Aerial delivery The act or process of delivering cargo or personnel by air transport or airdrop.
Air cargo Any goods or materiel shipped or consigned by air.
Air Force Life Cycle Management Center
(AFLCMC)
AFLCMC is one of the five centers under Air Force Materiel Command (AFMC). The AFLCMC is the single center responsible for total life cycle management of the Air Force weapon systems.
Air Mobility Command
(AMC)
A unified command of the US Air Force which operates a fleet of transport aircraft for both strategic and tactical support of DOD. In addition to military aircraft, AMC operates civilian aircraft under charter, contract, or lease.
AMCI Air Mobility Command Instruction
Air transport Delivery of personnel or cargo from point-to-point in which the cargo is offloaded after landing the aircraft.
Air Transport The process of moving cargo (including cargo carrying personnel) using aircraft.
Air transportability problem item
An item of equipment in its proposed shipping configuration which, because of its size, weight, fragile or hazardous characteristics, lack of adequate means for handling or tiedown, or requirement for special support equipment, may be denied transport aboard US Air Force prime mission cargo aircraft or the long range international segment of the Civil Reserve Air Fleet (CRAF). An item is considered a potential problem item when its design requirement includes transportability in such aircraft and the item exceeds any one of the conditions imposed in 1.3.1.
Air Transportability Test Loading Activity
(ATTLA)
USAF organization responsible for providing transportability engineering and design assistance and safety of flight airworthiness certification as related to transportability problem items to be airlifted onboard USAF prime mission cargo aircraft and Civil Reserve Air Fleet (CRAF) aircraft.
Air transportable Denotes equipment and cargo items which are certified by ATTLA that they can be safely carried in an aircraft.
Airdrop Delivery of personnel or cargo from point-to-point in which the cargo is offloaded prior to landing the aircraft.
Airdrop item The equipment in its reduced configuration for airdrop, including external or internal loads such as fuel, ammunition, field gear, or rations.
Airdrop systems Aircraft equipment used to perform personnel and cargo airdrop operations.
ATTLA parking tire loads
This is the tire weight when the cargo is in its final position in the aircraft.
The weight limit for flight is lower than for ground loading because the tire can put more than 1 G on the aircraft during flight due to air turbulence and crash. This flight weight may also be different than the ground loading weight if the cargo configuration changes for flight (e.g. deploying support jackstands or repositioning/removing equipment).
Bulk cargo General cargo capable of being stacked on the floor of an aircraft.
Buttock line (butt line, BL)
The distance from the longitudinal centerline of the aircraft measured in inches in an outboard direction. RBL or LBL is used to designate right and left hand side of aircraft when facing forward from aft end of the airplane.
C/B Center of Balance. The longitudinal location of the center of gravity along the length of the item. Its distance from a reference point on the item. For example, the C/B is 50 inches forward of the front axle.
Cargo Equipment or material transported in the aircraft. Cargo may be inert (e.g.
rice and beans), active (e.g. a refrigerator) and/or carry living things (e.g.
animal cage or patient in a stretcher).
Civil Reserve Air Fleet
(CRAF)
A group of commercial transport aircraft with crews, which is allocated in time of emergency, under the emergency war plan, for exclusive use by DOD to augment the AMC fleet.
Clearance limits The dimensions beyond which the size of, or projection of, a shipment may not extend in order to clear obstructions which restrict the handling or transportation of such shipment. Such limits may be actual or prescribed by law or regulation.
Compartment The entire cargo carrying volume of the aircraft is commonly referred to as the cargo compartment. However, each airframe has designated sections with weight/size limitations specifically referred to as “compartments”. These are named by letter (e.g. Compartment A).
Usually a compartment is between structural members or there is a need to distribute weight for balance.
Configuration A defined arrangement of the parts or elements of a cargo item, aircraft or equipment that is unique. For cargo, an M998 HMMWV with a smoke generator is a configuration of HMMWV. For aircraft, a C-5 in the forward kneel mode is a configuration of the C-5. For equipment, a forklift with rollerized tines is a configuration of a forklift.
Deployment The movement of strategic or tactical aircraft and units to an overseas location. This includes emergency movements, scheduled rotations of aircraft from CONUS bases to overseas bases, and related exercises.
DTR Defense Transportation Regulation
Dunnage (1) Shoring. See shoring definitions below.
(2) Material used to spread weight, to protect sensitive material or help with loading cargo. See “Shoring”.
Electrical outlets Electrical sockets/receptacles in the cargo compartment for supplying electricity to cargo.
Electromagnetic Compatibility (EMC)
(1) The capability of electrical and electronic systems, equipment, and devices to operate in their intended electromagnetic environment within a defined margin of safety, and at design levels of performance without suffering or causing unacceptable degradation as a result of electromagnetic interference (NATO).
(2) The ability of a device, equipment, or system to function satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment (IEEE Std.
100-1996).
Electromagnetic Interference (EMI)
(1) Any electromagnetic disturbance, whether intentional or not, that interrupts, obstructs, or otherwise degrades or limits the effective performance of electronic or electrical equipment (NATO).
(2) Degradation of the performance of an equipment, transmission channel, or system caused by an electromagnetic disturbance [IEC 60050-161 (1990-09)].
Envelope Boundaries shown in a manual or design standard that defines limits which, when exceeded, can cause damage or harm.
Federal Sponsor The federal sponsor (office, agency, or person that represents the U.S.
Government and develops, procures, owns, or transports the item) must send a memo requesting that ATTLA approve the item for airlift aboard USAF cargo aircraft.
Field Manual (FM) The Army version of the Air Force technical order (T.O.).
Forward, aft, and lateral movement
Movement of cargo is movement relative to the aircraft. Any movement towards the aircraft nose is “forward”. Movement to the aircraft tail is “aft”.
Movement to the left or right side is “lateral”. Even when a vehicle is backed into the aircraft, it is still moving “forward”. “Forward” restraint means the cargo is tied down to prevent it from moving forward.
Field Manual/Tech Order (FM/T.O.)
Series of instruction manuals for airdrop published by the US Army Quartermaster School, Ft Lee Va.
Fuselage station (FUS
STA, FS)
A longitudinal point in the aircraft designated in inches from a fixed reference point forward of the aircraft nose. For C-130J-30, see “Load Station”.
G-force The resultant force exerted on an object by gravity or by reaction to acceleration or deceleration. G is an acceleration ratio (a/g) of the item's acceleration (a) to the acceleration of gravity (g). When multiplied by an item's weight, the ratio gives the force experienced by the item due to acceleration/deceleration (also called G).
Hazardous material Substance or material which has been determined and designated by the Secretary of Transportation or the services to be capable of posing an unreasonable risk to health, safety, and property when transported.
Included are explosives, articles such as flammable liquids and solids, and other dangerous oxidizing materials, corrosive materials, compressed gases, poisons and irritating materials, etiologic agents and radioactive materials. (See provisions of Title 49 of the Code of Federal Regulations and AFMAN 24-204(I)/TM 38-250/NAVSUP PUB 505/MCO P4030.19(I)/DLAI 4145.3 for a complete listing of hazardous materials and certification requirements.)
Internal Air Transport Certification
Documentation issued by ATTLA showing that the cargo is certified for air transport. Limitations and special procedures are included in the letter.
K-loader Operational term for cargo loading vehicles used by the DOD. These vehicles are part of the 463L materials handling system. The number designation in front of the K (kips) represents the usual approximate working capacity of the vehicle, in 1000 pound units. For example, a 25K loader would have a capacity of 25,000 pounds.
Limit load The maximum load which will not produce permanent deformation of the tiedown provision or cargo support system (frame, axles, suspension, etc.).
Limits Restriction on an amount of something, such as size and weight, that is permissible or possible (also see Envelope).
Load (1) Cargo.
(2) Weight or force on structure.
Load Station (LS) A longitudinal point in the C-130J-30 (long fuselage C-130J) cargo compartment designated in inches from a fixed reference point forward of the aircraft nose. The C-130J-30 cargo compartment does not reference fuselage stations (FS) for loading cargo, Load Stations (LS) are used instead.
Loadmaster Member of the air crew. Supervises cargo activities and related functions, including aircraft loading and offloading activities, cargo handling, and restraint. Performs pre-flight inspections and post-flight inspections of aircraft and aircraft systems. Computes weight and balance and performs other mission specific duties. Provides for safety and comfort of passengers and troops, and security of cargo, mail, and baggage during flight. Conducts cargo and personnel airdrops.
Medevac Medical evacuation by airlift. Transporting patients by air.
Nonstandard pallet Pallet that has not been certified for airlift by the US Air Force.
Outsized cargo Outsized cargo exceeds the capabilities of C-130 aircraft and requires use of C-17 or C-5.
Overhang The distance, measured along the road surface between the centerline of the extreme end axles and the end of a vehicle. There can be a front and rear overhang.
Oversize cargo Oversize cargo is a single item that exceeds the usable dimensions of a 463L pallet (104 in. length × 84 in. width × 96 in. height for military aircraft).
Pallet A unit load device used for consolidation of cargo items for efficient handling. USAF standard pallets fall into two groups:
(1) Warehouse pallet. Generally a wood pallet 40 × 48 × 6 in., weighing 75 to 100 pounds, with a capacity of 2000 pounds.
(2) 463L pallet. A pallet designed as part of the 463L material handling system. They are compatible with military and commercial air cargo systems.
Palletized cargo Cargo transported on cargo pallet(s) or platform(s).
Pounds per Inch of Width (PIW)
This is a measure of lateral running load.
Platform A unit load device similar to the pallet but specifically designed for airdrop.
It is 108-inches wide with lengths ranging from 8 to 32 feet, in 4-foot increments.
Pounds per Linear Foot
(PLF)
This is a measure of longitudinal running load.
Pneumatic tire Tire filled with inert gas such as air or nitrogen.
Pneumatic tire loads Weight put on the aircraft floor by a tire that is filled with air (pneumatic).
This is NOT the internal air pressure of the tire.
Pounds per Square Inch
(PSI)
For air transport, this is a measure of floor contact pressure or tire inflation pressure.
Pounds per Square Inch Differential (PSID)
It is the difference between the cargo’s internal pressure and the air pressure outside the cargo when there is sudden loss of air pressure inside the airplane. The cargo retains an internal air pressure equivalent to 8,000 feet pushing out against the aircraft cabin pressure equivalent to a high altitude pressure at 40,000 feet. While flying at cruise altitude, the normal cabin air pressure the airplane maintains is 8,000 feet. This difference in pressure is 8.3 psi.
Ramp An aircraft structure that allows cargo to transverse into the aircraft cargo compartment from the ground
Ramp crest The crest of the ramp is the point where the inclined ramp joins the aircraft cargo floor at the hinge line. It is the critical point with respect to underside clearances of items being loaded from the ground up the aircraft ramp.
Ramp crest Ramp crest is the location where the cargo floor ends and the ramp or the ramp hinge begins. Ramp cresting is when the underside of the vehicle contacts the ramp crest.
Ramp toe loading Weight on the ramp toe (or ramp extension) during loading and unloading of cargo. The ramp toe is a structure that bridges the end of the aircraft cargo ramp to the ground.
Restraint The method of keeping cargo and any part of cargo from moving during air transport (also tiedown, tied down).
Roller systems (roller conveyor)
Cylindrical devices on the aircraft floor that allows palletized cargo to move throughout the aircraft cargo/ramp compartment.
Secondary Cargo Systems or cargo attached to or carried internally or externally on the primary cargo item, and rely on it for restraint, is classified as secondary cargo. Examples are air conditioning units on an ISO container, bulk supplies on a trailer bed, computers on equipment shelves, and personal gear in a vehicle.
Replaces the term “accompanying loads” used in the original version of MIL-STD-1791 to eliminate confusion. Aircraft cargo loading manuals use the term “accompanying loads” for separate cargo items carried on the same aircraft at the same time, with individual restraint to the aircraft.
Shipper A Service or agency activity (including the contract administration or purchasing office for vendors) or vendor that originates shipments. The function performed includes planning, assembling, consolidating, documenting, and arranging material movement (see DTR 4500.9-R, Part II and AMCI 24-101, Vol 11). The shipper is the owner of the equipment, the party that requires the item to be airlifted. It can be the acquisition office or the transportation agent. The aircrew and aerial port personnel are not the shippers.
Shoring Shoring is material used for a variety of purposes to facilitate cargo loading and to protect the aircraft. Plywood and dimensioned lumber are commonly used.
(1) Approach shoring (step-up shoring). Used to reduce the ramp angle that a vehicle must traverse during aircraft on/offloading.
(2) Parking shoring. Required during flight under the wheels or tracks of vehicular cargo to distribute loads or protect the cargo floor.
(3) Rolling shoring. Required during on/off loading under the wheels or tracks of vehicular cargo to distribute loads or protect the cargo floor.
(4) Sleeper shoring. Used to protect heavily loaded suspensions during hard landings.
(5) Bridge shoring. Used to spread heavy loads to more than one cargo compartment.
(6) Support shoring. Used to fully support an item or section of an item.
(7) Cresting shoring. Used to increase ground clearance at the ramp crest for loading.
Shoring Cushioning material placed under weighted structure of the cargo that is used to alleviate weight on the aircraft or provide support to the cargo structure to help it withstand aircraft flight loads. Another term is “dunnage”.
Skid A flat, weight bearing surface which is used as the primary means of ground contact for an item.
Skidboard Plywood boards used as a base for airdrop bundles and container delivery systems.
Solid tire There are several types of tires or wheels that are defined as solid.
The tire pressure exceeds definition for each aircraft type. For example 100 psi for the C-130 and 300 psi for the C-5. The tire is filled with foam or other solid material. It can be made of hard rubber or metal (e.g. steel-wheel). It can be airless (non-pneumatic). A caster and vibratory roller are also treated as solid tires.
Solid Wheel Refers to solid steel wheels, solid hard-rubber wheels, metal wheels with solid polymer “tires”, foam filled tires with minimal deflection characteristics, or any other wheel with line/ribbon ground contact.
Special Assignment Airlift Mission (SAAM)
Mechanism whereby government offices “rent” a USAF aircraft and crew for cargo transport or test purposes. To request a mission, prepare and submit DOD Form 1249 in accordance with Appendix Q of the Defense Travel Regulation (DTR) Part II, to request a SAAM mission. The DTR will identify current office to submit the request.
Special Consideration Cargo
All cargo that may require special handling procedures; contains hazardous…
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