C-17_Manual_Weight_Loads_(Mil-Std-1791B).pdf

INCH-POUND

MIL-STD-1791B

02 December 2014

SUPERSEDING

MIL-STD-1791A (USAF)

19 November 2012

DEPARTMENT OF DEFENSE

INTERFACE STANDARD

DESIGNING FOR INTERNAL AERIAL DELIVERY

IN FIXED WING AIRCRAFT

Comments, suggestions, or questions on this document should be addressed to the Air Force Life Cycle Management Center, Engineering Standards Office, AFLCMC/ENRS, Building 28, 2145 Monahan Way, Wright-Patterson AFB OH 45433-7017; DSN 674-5476, commercial (937) 904-5476 or by email to mailto:

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/.

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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 paragraph 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 roll-on 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 and Aeromedical Systems Branch’s (AFLCMC/WNUP’s) Aeromedical Test Laboratory (ATL), Wright-Patterson AFB. 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 airplanes 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 emailed to Air Force Code 11 at Engineering.Standards@us.af.mil or addressed to: AFMC AFLCMC/EZFC (ATTN: ATTLA), Building 28, 2145 Monahan Way, Wright-Patterson Air Force Base OH 45433- 7017. 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.

ii mailto:Engineering.Standards@us.af.mil https://assist.dla.mil/

Appendix B

B.4 C-17 Globemaster III.

C-17

FIGURE B-47. C-17.

The C-17 is a high-wing, high-bypass turbofan aircraft used for inter and intra theater air land and air drop missions. The aircraft is designed for on/offloading through the cargo door/ramp.

On/offloading is facilitated by the full width, load bearing floor, cargo door/ramp toes and the stabilizer struts. On/offloading can be accomplished directly from material handling equipment such as: K-loaders, forklifts, truckbed, flatbed or from the ground. Pallet on/offloading can be accomplished using the Logistic Rail Systems for logistics cargo and Airdrop Delivery System (ADS) for airdrop delivery and/or logistics cargo. General and palletized cargo, vehicles, and outsized cargo can be secured and transported in the cargo compartment. The cargo compartment can be configured for airdrop of paratroops, cargo or a combination of both.

Transport of passengers or troops is accomplished by installing onboard equipment. The aircraft has provisions for carrying (102) passengers/troops/paratroops and (36) aeromedical litter patients, a combination of litter patients and passengers, or a combination of passenger/cargo configurations.

B.4.1 Geometry.

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.

B.4.1.1 Ramp.

B.4.1.1.1 Projection.

FIGURE B-52. Cargo projection limits.

TABLE B-IV. Cargo projection limits inboard of X = ± 82.

TABLE B-V. Cargo projection limits inboard of X = ± 82.

Table is to be used when loading items between X = ± 82.

TABLE B-VI. Cargo projection limits outboard of X = ± 82.

TABLE B-VII. Cargo projection limits outboard of X = ± 82.

Table is to be used when loading items which will extend outboard of X = ± 82.

FIGURE B-53. Vehicle dimensional limits.

FIGURE B-53. Vehicle dimensional limits – continued.

FIGURE B-54. Vehicle projection limits.

TABLE B-VIII. Vehicle projection limits inboard of X = ± 82 – wheelbase less than 257 inches.

TABLE B-VIII. Vehicle projection limits inboard of X = ± 82 – wheelbase less than 257 inches – continued.

TABLE B-IX. Vehicle projection limits inboard of X = ± 82 – wheelbase 257 to 339 inches.

TABLE B-IX. Vehicle projection limits inboard of X = ± 82 – wheelbase 257 to 339 inches

– continued.

TABLE B-X. Vehicle projection limits inboard of X = ± 82 – wheelbase 340 inches +.

TABLE B-X. Vehicle projection limits inboard of X = ± 82 – wheelbase 340 inches + -continued.

TABLE B-XI. Vehicle projection limits outboard of X = ± 82 – wheelbase less than 257

TABLE B-XI. Vehicle projection limits outboard of X = ± 82 – wheelbase less than 257

TABLE B-XII. Vehicle projection limits outboard of X = ± 82 – wheelbase 257 to 339

TABLE B-XII. Vehicle projection limits outboard of X = ± 82 – wheelbase 257 to 339

TABLE B-XIII. Vehicle projection limits outboard of X = ± 82 – wheelbase 340 inches +.

TABLE B-XIII. Vehicle projection limits outboard of X = ± 82 – wheelbase 340 inches + -continued.

B.4.1.1.2 Cresting.

FIGURE B-55. Vehicle ramp crest limit.

FIGURE B-56. Vehicle ramp crest clearance limit.

TABLE B-XIV. Vehicle ramp crest clearance limits.

B.4.1.1.3 Ramp contact.

FIGURE B-57. Parking overhang limits.

FIGURE B-58. Allowable in-flight ramp loadable height.

TABLE B-XV. Vehicle ground contact limits.

B.4.1.1.4 Shoring.

FIGURE B-59. C-17 minimum approach shoring width under ramp toes.

FIGURE B-59. C-17 minimum approach shoring width under ramp toes – continued.

B.4.2. Strength.

B.4.2.1 Cargo Floor.

B.4.2.1.1 Compartments.

FIGURE B-60. Floor limitations.

B.4.2.1.2 Bulk/concentrated load.

FIGURE B-61. Concentrated floor loads – calculations.

B.4.2.1.3 Pneumatic tires.

FIGURE B-62. C-17 high pressure pneumatic tire limitations.

B.4.2.1.4 Solid wheels.

TABLE B-XVI. Steel and hard rubber wheel – allowable floor load limitations.

B.4.2.1.5 CG limits.

FIGURE B-63. Cargo weight loading envelope (non-E/R).

FIGURE B-64. Cargo weight loading envelope (E/R).

B.4.2.1.6 Tracks.

FIGURE B-65. Tracked vehicle articulated suspension.

B.4.2.1.7 Roller capacities.

NOTE: Omnidirectional Roller limit shown is for ground loading/unloading.

The limit for flight is 1,000 lbs.

FIGURE B-66. C-17 Rollers and limitations.

B.4.2.1.7.1 ADS Rails.

FIGURE B-67. C-17 ADS system.

B.4.2.1.7.2 Logistics Rails.

FIGURE B-68. C-17 logistic rail system.

B.4.2.2 Ramp.

FIGURE B-69. Ramp toes.

TABLE B-XVII. Ramp toe loading limitation chart.

TABLE B-XVII. Ramp toe loading limitation chart – continued.

FIGURE B-70. Allowable in-flight ramp payload.

FIGURE B-71. Ramp Lifting Limits.

B.4.2.2.1 Teeter.

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.

B.4.2.2.2 Roller capacities.

B.4.2.2.2.1 ADS Rails.

TABLE B-XVIII. ADS ramp platform weight limitations.

TABLE B-XIX. ADS pallet weight limitations.

B.4.3. Restraint.

B.4.3.1 Tiedown ring layout.

FIGURE B-74. Cargo tiedown rings/location.

TABLE B-XX. Tiedown ring ratings.

B.4.4 Additional Information.

B.4.4.1 Venting.

C-17 FIGURE B-75. Cargo compartment vents.

FIGURE B-75. Cargo compartment vents – continued.

B.4.4.2 Electrical.

FIGURE B-76. Cargo compartment electrical receptacles.

FIGURE B-76. Cargo compartment electrical receptacle – continued.

B.4.4.3 Tipoff.

FIGURE B-77. C-17 tip off curve.

B.4.4.5 Aeromed.

FIGURE B-78. C-17 aeromedical litter stations.