PD_articulating.doc

16 May 2011

PD09WRGBGBEA07

CAGE 98752

PURCHASE DESCRIPTION

ARTICULATING STAIRCASE MAINTENANCE STANDS

1. SCOPE

1.1 Scope. This Purchase Description (PD) covers the requirements for the Articulating Staircase Maintenance Stands (hereafter called the articulating staircase maintenance stand(s) / maintenance stand(s)). The articulating staircase maintenance stand allows maintenance personnel access to multiple aircraft to complete a variety of the maintenance tasks. The maintenance stands are relatively simple structures consisting of a frame assembly, main stairway, and upper work platform. The entire structure is mounted on casters, pneumatic tires, or a combination of the two. The stands shall be capable of being transported by military aircraft to various locations worldwide.

1.2 Classification. The Articulating Staircase Maintenance Stands shall be of the following types, as specified (see section 6.2)

1.2.1 Types.

Type I – Low Reach Articulating Staircase Maintenance Stand Type II – Medium Reach Articulating Staircase Maintenance Stand Type III – High Reach Articulating Staircase Maintenance Stand

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification 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 specification, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks of the exact revision listed below form a part of this specification to the extent specified herein.

FEDERAL STANDARDS

DEPARTMENT OF DEFENSE SPECIFICATIONS

DEPARTMENT OF DEFENSE STANDARDS

DEPARTMENT OF DEFENSE HANDBOOKS

(Copies of these documents, except for MIL-HDBK-1791 C-17 Appendix, are available online at http://assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094. A copy of MIL-HDBK-1791 C‑17 Appendix can be obtained from the Procuring Contracting Officer (PCO) or requested by contacting Air Transportability Test Loading Agency (ATTLA) at 937-255-6296.)

2.2.2 Other Government documents.

AIR FORCE OCCUPATIONAL SAFETY & HEALTH

(Electronically available at:

www.e-publishing.af.mil/pubfiles/af/48/afoshstd48-8/afoshstd48-8.pdf and www.e-publishing.af.mil/pubfiles/af/91/afoshstd91-501/afoshstd91-501.pdf )

AMERICAN NATIONAL STANDARD

(Application for copies should be addressed to The American National Standards Institute, 11 West 42nd Street, New York, NY 10036.)

OCCUPATIONAL, SAFETY, AND HEALTH STANDARDS

OSHA 1910.29

Manually Propelled Mobile Ladder Stands and Scaffolds (Towers) (Electronically available at: http://www.osha.gov/pls/oshaweb/owastand.display_standard_group?p_toc_level=1&p_part_number=1910)

2.3 Non-Government publications. The following documents of the exact revision listed below form a part of this document to the extent specified herein.

AMERICAN WELDING SOCIETY (AWS)

(Application for copies should be addressed to American Welding Society, 550 N.W. LeJeune Road, Miami FL 33126.)

SOCIETY OF AUTOMOTIVE ENGINEERS (SAE)

(Application for copies should be addressed to SAE, Inc., 400 Commonwealth Drive, Warrendale PA 15096.)

2.4 Order of precedence. Unless otherwise specified herein or in the contract, in the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 First Article (FA). When specified (see 6.2), two (2) maintenance stands shall be subjected to FA inspection in accordance with 4.2.

3.2 Articulating staircase maintenance stand description. The articulating staircase maintenance stand consists of a frame, mounted on casters/tires with locking brakes, a main stairway, and an upper work platform. The maintenance stand shall be towable and capable of being disassembled for air transport to military locations worldwide. The maintenance stand shall be adjustable by a hydraulic system with a positive locking mechanism for all heights within the range of adjustment and working levels. The maintenance stand shall, as a minimum, be in accordance with the requirements of this specification.

3.3 Design and construction. The articulating staircase maintenance stand shall be designed and constructed so that no parts will work loose in service. They shall be built to withstand the strains, jars, vibrations, and other conditions incident to shipping, storage, installation, and service. They shall be weatherproof and designed to prevent the intrusion of water and sand into critical operating components.

3.3.1 Materials, protective coatings, and finish.

3.3.1.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials shall be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. However, used, rebuilt, or refurbished items shall not be provided.

3.3.1.2 Protective coatings. Materials that deteriorate when exposed to sunlight, weather, or operational conditions normally encountered during the service life of the item shall not be used or shall have means of protection against such deterioration that does not prevent compliance with the performance requirements specified herein. Protective coatings that chip, crack, or scale with age or extremes of climatic conditions or when exposed to heat shall not be used. Fasteners, handles, and fittings used in the assembly of the item shall also be primed and painted. Surface preparation and pretreatment shall be in accordance with the respective primer and topcoat specifications. Structures shall be cleaned and degreased and scuffed or blasted prior to priming; primer shall be applied before any oxidation or rusting occurs. Ferrous structures and surfaces shall be primed with a water reducible zinc rich primer in accordance with MIL‑PRF‑26915, Type II, Class B; this shall be followed, within four (4) hours, by a coat of MIL‑DTL‑0053030 intermediate primer in a wet-to-wet primer application. This two (2) part primer system shall yield a dry-film thickness of 2.0-2.5 mils for the zinc primer and 0.9 to 1.1 mils for the intermediate primer. The two-primer system shall be allowed to dry and fully cure in accordance with the primer manufacturer's directions prior to top coating. Aluminum surfaces shall have MIL‑DTL‑5541, Type I, Class 1A, chromate conversion coating applied in accordance with the manufacturer’s directions prior to priming. Aluminum and mixed aluminum and ferrous structures and surfaces shall be primed with strontium chromate based corrosion inhibitor, Type I, Class C2 of MIL-PRF-23377. This single part primer system shall yield a dry-film thickness of 0.6 to 0.8 mils. Raw metal edges, to include fastener and drain holes, shall be coated with primer before applying topcoat. Topcoat shall be polyurethane in accordance with Type I, Class H of MIL-PRF-85285. Neither Chemical Agent Resistant Coating (CARC) nor powder coating shall be used. Topcoat shall be applied to a dry film thickness of 1.6 to 2.4 mils in all instances, regardless of the primer system utilized. The coating shall be free from runs, sags, orange peel, or other defects.

3.3.1.3 Dissimilar metals. Dissimilar metals, as defined in MIL-STD-889, shall not be in contact with each other. Metal plating or metal spraying of dissimilar base metals to provide electromotively compatible abutting surfaces is acceptable. The use of dissimilar metals only when separated by suitable insulating material is permitted, except in systems where bridging of insulation materials by an electrically conductive fluid can occur. Sealants or gel type gasket materials shall be used between faying surfaces and butt joints.

3.3.1.4 Finish. The exterior finish color of the maintenance stand shall be Ocean Gray, Color Number 26173 of FED-STD-595.

3.3.1.5 Fluid traps and faying surfaces. There shall be no fluid traps on the maintenance stand. Faying surfaces of all structural joints, except welded joints, shall be sealed to preclude fluid intrusion.

3.3.1.5.1 Ventilation. Ventilation shall be sufficient to prevent moisture retention and buildup.

3.3.1.5.2 Drainage. Drain holes shall be provided to prevent collection or entrapment of water or other unwanted fluid in areas where exclusion is impractical. All designs shall include considerations for the prevention of water or fluid entrapment and ensure that drain holes are located to effect maximum drainage of accumulated fluids. The number and location of drain holes shall be sufficient to permit drainage of all fluids when the unit is in a 10 degree incline in any plane. The minimum size of the drain holes shall be 0.25 inch.

3.3.2 Markings. All external devices which require an operational or maintenance interface shall be marked in accordance with MIL-STD-130. Painted markings shall be 1 inch high block letters unless prohibited by the available space. In such cases, the markings shall be the largest size possible, but shall not be less than 0.5 inch high. Markings, Information/Caution shall be Lusterless Black, Color Number 37038 of FED-STD-595, and Markings, Warning/Danger shall be Lusterless Red, Color Number 31136 of FED-STD-595. The center of gravity of the maintenance stand shall be stenciled on the unit within one (1) inch of the calculated center of gravity.

3.3.3 Identification and information plates.

3.3.3.1 Identification plate. An identification plate in accordance with MIL-STD-130 shall be securely attached to the articulating staircase maintenance stand in a readily accessible location. The identification plate shall contain the following information: nomenclature, part number, serial number, date of manufacture, manufacturer’s name, Commercial and Government Entity (CAGE) code, date of warranty expiration, and National Stock Number (NSN). The maintenance stand and any components costing more than $5,000.00 shall be marked and comply with the Item Unique Identification (IUID) requirements of MIL-STD-130. UID information shall be included as both a bar code and human readable markings.

3.3.3.2 Transportation data plate. A transportation data plate shall be securely attached to the maintenance stand in a readily accessible location. The plate shall contain at least the following information:

a. Side and rear silhouette views of the articulating staircase maintenance stand.

b. Horizontal and vertical location of the center of gravity of the maintenance stand in air transportable configuration, marked on the silhouette views.

c. Shipping weight.

d. Loading cubage.

e. Overall height, width, and length.

f. Front and rear axle loads.

g. Tie down information.

3.3.4 Safety.

3.3.4.1 System safety. The design of the maintenance stand shall not contain any system safety mishap risk categories greater than medium as defined in Table A-IV of MIL-STD-882.

3.3.4.2 Component protection. All space in which work is performed during operation, service, and maintenance shall be free of hazardous protrusions, sharp edges, or other features which may cause injury to personnel. All rotating and reciprocating parts and all parts subject to high operational temperatures or subject to being electrically energized, that are of such nature or so located as to be hazardous to personnel, shall be guarded or insulated to eliminate the hazard.

3.3.4.3 Foreign object damage (FOD). All loose metal parts, such as pins or connector covers, shall be securely attached to the maintenance stand with wire ropes or chains. "Dog tag" style beaded chains shall not be provided. Removable panels, if provided, shall be attached with captive fasteners. Tire valve stem caps shall be made of plastic.

3.3.4.4 Electrostatic discharge. The design of the articulating staircase maintenance stand shall preclude equipment damage due to electrostatic discharge (ESD), protect personnel from electrical shock due to static charging, and prevent ignition of explosive atmospheres due to sparking.

3.3.5 Human engineering.

3.3.5.1 Human engineering criteria. Human engineering criteria principles and practices shall be considered as part of the design and construction of the maintenance stands. The stands shall be designed for ease of operation, inspection, and maintenance, including the use of arctic mittens and / or Mission-Oriented Protective Posture (MOPP) Level 4 Chemical Warfare Gear by the 5th percentile female through the 95th percentile male personnel. The use of night-vision goggles by the operator shall be considered in the layout. Special emphasis shall be given, but not limited to, controls, labeling, anthropometry, design for maintainability, and hazard and safety criteria, as applicable. Specifications MIL-HDBK-759 may be used for information and guidance on human factors engineering, and MIL-STD-1472 and may be used as a source for anthropomorphic data.

3.3.5.2 Human factors. The design shall foster effective performance of operating procedures, an effective personnel safety and health environment, and minimize factors that contribute to increased operator error. The design shall incorporate protection from toxic, electrical, thermal, mechanical, and other potential hazards. The design shall also reflect efficient arrangement of equipment and components; and feature characteristics that ensure a rapidity, safety, ease, and economy of use. The equipment shall represent the simplest design consistent with functional requirements.

3.3.6 Fastening devices. All screws, bolts, nuts, pins, and other fastening devices shall be properly designed, manufactured, and installed with adequate means of preventing loss of torque or adjustment. Cotter pins, lock washers, or nylon patches shall not be used for this purpose, except for the attachment of trim items or as provided in commercial components. Tapped aluminum threads shall have a minimum thread engagement of at least two times the nominal fastener diameter.

3.3.7 Welders and welding. All welders shall be certified to weld in accordance with the appropriate AWS standards; D1.1 and D1.2. The contractor shall make available to the Government certifications for all welders being utilized on the articulating staircase maintenance stand. Welding procedures and all welding on the maintenance stand shall be in accordance with AWS D1.1 and AWS D1.2. The parts’ surfaces to be welded shall be free from rust, scale, paint, grease, and other foreign matter. Welds shall be of sufficient size and shape to develop the full strength of the welded parts. Welds shall transmit stress without cracking or permanent distortion when the parts connected by the welds are subjected to test, proof, and service loadings.

3.3.8 Foolproofness. Where improper installation of an item causes a malfunction, an asymmetric mounting system shall be provided, where practical, to ensure proper mounting of the item.

3.3.9 Service life. The articulating staircase maintenance stand shall be designed for a minimum service life of 25 years.

3.3.10 Hydraulic system design. The hydraulic system shall be in accordance with 3.13.1.3 of SAE ARP1247 except as otherwise specified herein. O-ring face seal hydraulic fittings may be used in lieu of flared fittings (see 3.13.1.3.12 of SAE ARP1247). Hydraulic fluid shall be in accordance with MIL-PRF-83282D or MIL-PRF-87257B. All hydraulic system components, including the hydraulic tank, shall comply with all corrosion resistance requirements specified herein.

3.4 Environmental conditions.

3.4.1 Operating temperature range. The maintenance stand shall be capable of operating in ambient temperatures ranging from -40 F to +140 F.

3.4.2 Storage temperature range. The maintenance stand shall be capable of being stored in ambient temperatures ranging from -65 F to +160 F.

3.4.3 Precipitation.

3.4.3.1 Rain. The maintenance stand shall be capable of storage and operation during rainfall of five (5) inches per hour for three consecutive hours and ten (10) inches per hour for 10 consecutive minutes, with winds of up to 35 knots; and with six (6) inches of rain per hour impinging on the maintenance stand at angles from vertical to 45 degrees.

3.4.3.2 Snow and ice. The maintenance stand shall be capable of storage and operation during snow accretion up to two (2) inches per hour for at least 12 hours and up to 1.5 inches of ice.

3.4.4 Solar radiation. The maintenance stand shall not be adversely affected by full time exposure to solar radiation, such as those conditions encountered in desert environments.

3.4.5 Fungus. All materials used in the maintenance stand shall be fungus resistant or shall be suitably treated to resist fungus. Materials treated for fungus resistance shall retain their original electronic and physical properties, shall not present toxic hazards, and treatment shall last for the entire service life of the part. The maintenance stand shall be suitable for operation and storage in conditions encountered in a tropical environment.

3.4.6 Salt fog. The maintenance stand shall be capable of storage and operation in high temperature, high humidity, salt laden, and sea coast environments without damage or deterioration of performance.

3.4.7 Sand and dust. The maintenance stand shall be capable of storage and operation during exposure to wind-blown sand or dust without damage or deterioration of performance.

3.5 Transportability.

3.5.1 Surface transportability. The maintenance stand shall be transportable via all modes of surface shipment: rail, sea, road, etc. and shall be capable of withstanding mechanical shock and vibration characteristics of rail, sea, and road transport.

3.5.2 Air transportability. The maintenance stand shall be transportable on C-130, C-5, and C-17 aircraft. Design criteria can be found in MIL-HDBK-1791. In all air transport configurations, the maintenance stand shall be capable of being restrained and withstanding, without loss of serviceability, 2.0 G up and 4.5 G down accelerations, and shall be capable of being restrained and withstanding, without loss of structural integrity, 3.0 G forward, 1.5 G aft, and 1.5 G lateral accelerations. The maintenance stand shall be configured for air transport to prevent any part from becoming a projectile in the event of catastrophic loss of aircraft cabin pressure. The maintenance stand shall roll on and off the aircraft, negotiating the required maximum ramp angles (20 degrees) without shoring. The maintenance stand when configured for air shipment shall be capable of being stacked.

3.5.2.1 Shoring. The maintenance stand shall be air transportable without shoring.

3.5.2.2 Tire pressure. Tire pressure shall not exceed 100 pounds per square inch (psi) and shall not be reduced for air transport.

3.5.2.3 Tiedowns. The maintenance stand shall be symmetrically restrained during air and ground transport. Tiedown points shall be rated at a minimum of 25,000 pounds, marked for capacity, with a clear opening compatible with the appropriate devices. Each end of each tiedown device shall terminate at a tiedown point and not pass through any other tiedown point. There shall be no interference between tiedown devices and the maintenance stand. The axles may be used as tiedown points; however, no more than 50 percent of the restraint in any direction may be provided by the axles.

3.5.2.4 Winch points. Winch points shall be provided at the front and rear of the maintenance stand for aircraft loading using the aircraft’s winch.

3.5.2.5 Equipment removal and reconfiguration. Preparation for air transport shall take no more than half (1/2) of a man-hour and restoration to operating configuration shall take no more than half (1/2) of a man-hour for two (2) persons using common hand tools. All equipment removed shall be stored on the maintenance stand; caps and plugs shall permit moving and storage in transport configuration.

3.5.3 Lifting provisions. The maintenance stand shall be equipped with sufficient attachment points so located that it can be lifted by crane; each attachment point shall be marked "Lift Point". The lifting provisions shall be in accordance with MIL-STD-209.

3.6 Maintainability.

3.6.1 Preventive maintenance.

3.6.1.1 Mean time between preventative maintenance (MTBPM). The maintenance stand shall have a MTBPM of not less than 250 operating hours and not less than 500 cycles. MTBPM of 500 operating hours or greater is a goal.

3.6.1.2 Tasks. Preventative maintenance tasks shall be limited to a maximum of eight (8) man-hours.

3.6.1.3 Cycle. One cycle consists of towing the maintenance stand to specified location and returning it to its original location. During this cycle, the following criteria shall be met:

a. Two ninety (90) degree turns (one left and one right) must be made.

b.

Platform shall be fully extended and retracted per normal operating procedures.

3.6.2 Inspection and servicing provisions.

a. Routine servicing tasks and pre-use inspections shall require no hand tools.

b. Drain plugs and filters shall be directly accessible and oriented to have unimpeded drainage to a catch pan.

c. The maintenance stand shall be designed with maximum usage of sealed lifetime lubrication bearings.

d. The maintenance stand shall be designed so the correct oil and coolant levels can be checked while the unit is running.

3.6.3 Operability. All components shall be selected and located for maximum ease of operation, servicing, inspections, and maintenance. Additionally, the articulating staircase maintenance stand design shall allow the user to operate while wearing cold weather gear and or all Mission Oriented Protective Posture (MOPP) ensembles.

3.7 Safety standards. The articulating staircase maintenance stands shall conform to all applicable sections and paragraphs of OSHA 1910.29, AFOSH 91-100, AFOSH 91-501, and ANSI A92.3 standards. The contractor shall be solely responsible for ensuring that the standards are met. The maintenance stands shall successfully pass an OSHA and AFOSH inspection, conducted by a government safety inspector, during the First Article Operational Inspection.

3.7.1 Fall protection. Fall protection system shall be provided on each maintenance stand as applicable to OSHA 1910.66 Appendix C, AFOSH 91-100 (Section 8.2.5 Fall Protection Requirements), and AFOSH 91-501 (Chapter 13 Fall Protection) standards.

3.8 Performance.

3.8.1 Chassis/Frame. The size and weight of the maintenance stand shall be as small as practical. When deemed necessary to meet all applicable OSHA/AFOSH/ANSI standards / requirements and approved by the Government, the offeror will be allowed to exceed dimensional footprint of the maintenance stand by no more than 25 percent in any direction. The Shear Modulus of all members, of the maintenance stand frames, shall be a minimum of 3.7 X 106 psi.

3.8.1.1 Base footprint. The base dimensional footprint shall be:

Type I: 132 inches long by 48 inches wide.

Type II: 192 inches long by 60 inches wide.

Type III: 168 inches long by 126 inches wide.

3.8.1.2 Platform footprint. The platform dimensional footprint shall be:

Type I: 66 inches long by 48 inches wide.

Type II: 48 inches long by 84 inches wide.

Type III: 48 inches long by 48 inches wide.

3.8.1.3 Weight. The weight of the articulating stairway maintenance stand shall not exceed:

Type I: 1,300 pounds Type II: 2,000 pounds Type III: 2,000 pounds.

3.8.1.4 Platform working load. The maximum operating platform load on each articulating stairway maintenance stand shall be 750 pounds. Platform fatigue in the form of “oil canning” or waviness in the platform decking is unacceptable. The two working levels shall be designed to provide a safety factor of at least four (4) times the design working load per OSHA 1910.29 and AFOSH 91-501 standards, while accomplishing any of the performance requirements stated herein. Safety factors shall be based on minimum material yield strength. Platform levels shall be designed for a minimum of 40 pounds per square foot (psf) loading criteria.

3.8.2 Mobility. The articulating stairway maintenance stand shall comply with all mobility requirements specified in AS8090 for Type I, Class 2 equipment ground mobility.

3.8.2.1 Towbar. A towbar shall be provided on the articulating stairway maintenance stand to provide a means of attaching a towing vehicle for movement of the maintenance stand in maintenance areas and across the flightline. The towbar shall be stowable in a location that does not interfere with visibility or maintenance operations. The towbar shall have a lunette eye conforming to A-A-52464B.

3.8.3 Vertical actuator. The articulating stairway maintenance stand shall be adjustable via the use of hydraulic actuators. The working level heights shall be:

Type I: from 3 feet to 12 feet.

Type II: from 7 feet to 16 feet.

Type III: from 13 feet to 20 feet.

3.8.4 Tires/Wheels.

3.8.4.1 Casters. Casters shall be steerable, lockable in forty-five (45) degree increments, durable and capable of withstanding operation over rough improved surfaces (potholes), inclines, or hangar door tracks without causing damage to the maintenance stands or casters. The casters shall include a poly cam style brake.

3.8.4.2 Pneumatic tires. Pneumatic tires when utilized shall be of a split rim design and bolted in the middle. Pneumatic tires shall be of rated-capacity to be at least equal to the load imposed on each tire. The tire shall be capable of withstanding and operating over rough improved surfaces (potholes), hangar door tracks, etcetera. The pneumatic tires shall include a pneumatic poly cam style brake.

3.8.5 Rolling force/resistance. The force required to move each maintenance stand shall not exceed the values in 5.9.11.4.1 per MIL-STD-1472 and associated tables. The number of personnel required to move each maintenance stand shall not exceed two (2) people (5th percentile females).

3.8.6 Platform.

3.8.6.1 Deck surface. All decking surfaces shall be anti-skid and resistant to jet fuel, aircraft hydraulic fluid, and cleaning and degreasing solvents. Anti-skid surfaces shall prevent slipping and allow for kneeling, crouching, and lying down of maintainers without causing minor injuries such as abrasions during aircraft maintenance.

3.8.6.2 Handrails. Handrails / guard rails shall comply with all OSHA / AF / ANSI Safety standards and shall include a top rail, 42 inches high, and mid rail that comply with an applied pull force of 300 pounds, in any direction. The perimeter railing shall be operated by one person. All handrails shall be removable and shall have a locking mechanism (i.e. quick release pin with retaining chain / nut and bolts) that will be engaged whenever the rails are in position.

3.8.6.3 Toeboards. Toeboards shall be provided around perimeter of the maintenance stand in accordance with OSHA 1910.29 AFOSH 91-100, and AFOSH 91-501 standards. The toeboard shall have a minimal height of four (4) inches.

3.8.6.4 Platform access opening. The platform access opening shall be used for the entry and exit of the platform from the articulating staircase. The platform access opening shall include a means of closing / blocking the platform whenever personnel are on the platform and the staircase angle exceeds 60 degrees. The design for the closing / blocking of the access opening shall be in a normally open position (during towing / storage). The design will require the operator to close / block the access opening when utilizing the platform. The design shall meet the requirements of sections 3.8.6.2 and 3.8.6.3 of this PD.

3.9 Workmanship. The maintenance stand, including all parts and accessories, shall be constructed and finished in a thoroughly workmanlike manner. Workmanship objectives shall include freedom from blemishes, defects, burrs and sharp corners and edges; accuracy of dimensions, surface finish, and radii of fillets; thoroughness of welding, painting, and riveting; marking of parts and assemblies; proper alignment of parts and tightness of assembly fasteners; etc.

3.9.1 Bolted connections. Bolt holes shall be accurately punched or drilled and shall be deburred. Threaded fasteners shall be tight and shall not work loose during testing or service usage.

3.9.2 Riveted connections. Rivet holes shall be accurately punched or drilled and shall be deburred. Rivets shall be driven with pressure tools and shall completely fill the holes. Rivet heads shall be full, neatly made, concentric with the rivet holes and in full contact with the surface of the component.

3.9.3 Gear and lever assemblies. Gear and lever assemblies shall be properly aligned and meshed and shall be operable without interference, tight spots, loose spots, or other irregularities. Where required for accurate adjustment, gear assemblies shall be free of excessive backlash.

3.9.4 Cleaning. The maintenance stand shall be thoroughly cleaned. Loose, spattered, or excess solder; welding slag; stray bolts, nuts, and washers; rust; metal particles; pipe compound; and other foreign matter shall be removed during and after final assembly.

3.9.5 Tooling. Standard commercial tooling shall be utilized wherever possible. In the event that standard commercial tooling cannot be used and specialized tooling is required, one (1) set of special tool kits shall be provided with each maintenance stand. Metric tools are not considered special tools. The maintenance stand shall be field maintainable using a minimum number of common standard hand tools. All major components shall be replaceable by field level maintenance technicians. The field shall be capable of repairing 80 percent of the repairable parts. All inspections shall be capable of being performed from a standing position.

3.10 Instructional media package. Maximum use of exportable courses is required (i.e. DVD/CD). Courses shall provide training on servicing, operational checks, theory of operation, adjustment procedures, troubleshooting, and associated diagrams. Two sets of courses shall be delivered to each location with production hardware.

4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:

a. First Article inspection (see 4.2).

b. Operational inspection (see 4.3).

c. Conformance inspection (see 4.4).

4.2 First Article inspection. The FA maintenance stands shall be subjected to the examinations, tests, and analyses described in 4.6.1 through 4.6.16. The contractor shall provide or arrange for all test equipment and facilities.

4.3 Operational inspection. A 90 day operational inspection will be performed following the successful completion of the FA tests specified section 4.6. The inspection will be performed at Edwards AFB and Travis AFB, both located in CA. The inspection will begin the day following the delivery of the articulating staircase maintenance stand to the specified locations.

4.4 Conformance inspection. Each production maintenance stand shall be subjected to the examinations and tests described in 4.6.1.

4.5 Inspection requirements.

4.5.1 General inspection requirements. Apparatus used in conjunction with the inspections specified herein shall be laboratory precision type with calibration certificates and calibrated at proper intervals to ensure laboratory accuracy.

4.5.2 Data. During all testing specified herein, at least the following data, unless not applicable, shall be recorded at intervals not to exceed 30 minutes. Additional data and/or shorter intervals shall be provided as appropriate for any specific test.

a. Date.

b. Time started.

c. Time finished.

d. Ambient temperature.

4.5.3 Test rejection criteria. Throughout all tests specified herein, the maintenance stand shall be closely observed for the following conditions, which shall be cause for rejection:

a. Failure to conform to design or performance requirements specified herein or in the contractor's technical proposal.

b. Any spillage or leakage of any liquid, including lubricant or hydraulic fluid, under any condition, except as allowed herein.

c. Structural failure of any component, including permanent deformation, or evidence of impending failure.

d. Evidence of excessive wear.

e. Evidence of misalignment to the aircraft; including inability to provide safety compliant working surfaces.

f. Interference between the maintenance stand components or between the maintenance stand, the ground, and all required obstacles, with the exception of normal contact by the tires.

g. Misalignment of components.

h. Evidence of undesirable roadability characteristics, including instability in handling during cornering, braking, and while traversing all required terrain.

i. Conditions that present a safety hazard to personnel during operation, servicing, or maintenance.

j. Evidence of corrosion or deterioration.

4.6 Test methods.

4.6.1 Examination of product. Each maintenance stand shall be examined / visually inspected to verify compliance with all the requirements identified herein. A contractor-generated, Government-approved checklist that identifies each relevant requirement not verified by a test or analysis and the inspection results shall be used. Particular attention shall be given to materials, workmanship, dimensions, surface finishes, protective coatings and sealants and their application, welding, fastening, and markings per the requirements of 3.3.1 through 3.3.1.5.2, 3.3.2, 3.3.3 through 3.3.3.2, 3.3.6, 3.3.8, and 3.9 through 3.9.4. Proper operation of each maintenance stand function shall be verified. Each production maintenance stand shall be inspected to a Government-approved reduced version of the checklist.

4.6.2 System safety.

4.6.2.1 System safety hazard analysis. A system safety hazard analysis of the maintenance stand shall be conducted in accordance with 4.2 through 4.8 of MIL-STD-882 to demonstrate compliance with the mishap risk requirement of 3.3.4.1.

4.6.2.2 Safety components. A FA maintenance stand shall be inspected to demonstrate compliance with the requirements of 3.3.4.2 and 3.3.4.3.

4.6.3 Human factors demonstration. The FA maintenance stand shall be capable of performing both operation and inspection tasks by personnel wearing arctic mittens and / or MOPP Level 4 Chemical Warfare Gear to demonstrate compliance with the requirements of 3.3.5.

4.6.4 Electrostatic discharge analysis. An engineering analysis shall be performed to demonstrate compliance with the electrostatic discharge requirement of 3.3.4.4.

4.6.5 Service life analysis. An engineering analysis shall be performed to demonstrate compliance with the service life requirement of 3.3.9.

4.6.6 Environmental testing.

4.6.6.1 High temperature storage and operation test. A FA maintenance stand shall be tested in accordance with MIL-STD-810, Method 501.5, Procedures I and II, to demonstrate compliance with the high temperature storage and operating requirements of 3.4.1 and 3.4.2. Test duration shall be one 24-hour cycle for each procedure.

4.6.6.2 Low temperature storage and operation test. A FA maintenance stand shall be tested in accordance with MIL-STD-810, Method 502.5, Procedures I and II, to demonstrate compliance with the low temperature storage and operating requirements of 3.4.1 and 3.4.2. Test duration shall be one 24-hour cycle for each procedure.

4.6.6.3 Precipitation tests.

4.6.6.3.1 Rain test. A FA maintenance stand shall be tested in accordance with MIL‑STD-810, Method 506.5, Procedure I, to demonstrate compliance with 3.4.3.1.

4.6.6.3.2 Ice accretion test. A FA maintenance stand shall be tested in accordance with MIL‑STD‑810, Method 521.3 with an ice thickness of 1.5 inches to demonstrate compliance with the ice accretion requirement of 3.4.3.2.

4.6.6.4 Salt fog test. A FA maintenance stand shall be tested in accordance with MIL-STD-810, Method 509.5 to demonstrate compliance with 3.4.6. Test duration shall be alternating 24 hour periods of salt fog exposure and drying conditions for 24 hour periods (two (2) wet and two (2) dry).

4.6.6.5 Sand and dust test. A FA maintenance stand shall be tested in accordance with MIL‑STD‑810, Method 510.5, Procedures I (12 hours) and II (90 minutes per side), to demonstrate compliance with 3.4.7.

4.6.7 Transportability verification.

4.6.7.1 Surface transportability analysis. An engineering analysis shall be performed to demonstrate compliance with 3.5.1. The engineering analysis shall utilize the data for rail, ship, and road transportation modes referenced in MIL-STD-810, Method 514.6.

4.6.7.2 Air transportability analysis. An engineering analysis shall be performed to demonstrate compliance with the air transportability requirements of 3.5.2 through 3.5.2.4. The analysis shall include the tie downs and all major components and their ability to withstand the accelerations specified in MIL-HDBK-1791. The evaluation shall also include a dimensional analysis for the maintenance stand while traversing the ramp and while loaded aboard C-130, C-5, and C-17 aircraft.

4.6.7.3 Equipment removal and reconfiguration test. A FA maintenance stand shall be configured for transport on C-130, C-5, and C-17 aircraft and then reconfigured for operation to demonstrate compliance with 3.5.2.5. It shall be demonstrated that the forces required do not exceed those allowed in MIL-STD-1472.

4.6.7.4 Lifting provision analysis. An engineering analysis shall be performed to demonstrate compliance with the lifting provision requirements of 3.5.3.

4.6.8 Maintainability demonstration. Corrective maintenance tasks shall be selected by the procuring activity from an approved list of tasks provided by the contractor and shall be performed in accordance with paragraph 3.6 through 3.6.3 of this document. This list shall represent all expected failures over the life of the maintenance stand. Thirty of the tasks shall be selected by the Government. As part of this demonstration, the recommended frequencies of the scheduled maintenance tasks and the times recorded to accomplish the tasks shall be used to develop an expected value of scheduled maintenance time per measure of use, such as calendar time and hours of operation. The capability of performing both preventive and corrective maintenance tasks by personnel wearing arctic mittens and / or MOPP Level 4 Chemical Warfare Gear shall be demonstrated.

4.6.9 Welds and welding. All welds shall be inspected to ensure proper penetration and visually verified to be free from weld defects including but not limited to, cracks, undercut, concavity, convexity, and porosity in accordance to 3.3.7. Inspection shall be completed by an AWS Certified Weld Inspector during and after the construction of the maintenance stand. Documentation of all inspections of the welds on the maintenance stands shall be provided to the Government. The Government reserves the right to require verification inspection at any time during construction per AWS D1.1 Paragraph 6.1.2.2, 5.1.1 of AWS D1.2, and Non-specified NDT Other than Visual per AWS D1.1 Paragraph 6.6.5. All welding documentation for subsequent production units shall be made available to the Government at any time during the life of the contract pursuant to AWS D1.1 and D1.2.

4.6.10 Hydraulic system. The hydraulic system shall provide pressure and flow rate in accordance with paragraph 3.3.10 of this document. All hydraulic connections shall be tested to ensure compliance with this document.

4.6.11 Fall protection system. The maintenance stands shall demonstrate compliance with the fall protection requirements per OSHA, AFOSH, and ANSI Standards as detailed in paragraph 3.7 and 3.7.1 of this document. Installation of fall protection equipment shall be verified to be in conformance with the manufacturer’s explicit instructions. Fall Protection Equipment with Certificates of Conformance to the standards specified in this document does not require individual load testing.

4.6.12 Platform.

4.6.12.1 Dimension measurement tests. A FA maintenance stand shall be measured to demonstrate compliance with the dimensional requirements of 3.8.1 through 3.8.1.2.

4.6.12.2 Weight measurement tests. The weight of a FA maintenance stand shall be measured to demonstrate compliance with the weight requirements of 3.8.1.3.

4.6.12.3 Load tests. The FA maintenance stand shall be loaded to four (4) times their maximum load capacity in compliance with the requirements of 3.8.1.4.

4.6.12.4 Platform requirements tests. The FA maintenance stand shall be inspected to demonstrate compliance with the requirements of 3.8.6 through 3.8.6.4.

4.6.13 Towing/Maneuverability tests. A FA maintenance stand shall be inspected and operated to demonstrate compliance with the requirements of 3.8.2 through 3.8.2.1. The maintenance stand shall be tested IAW SAE AS8090 for a Type I, Class 2 vehicle. The towbar shall be inspected and the maintenance stand shall be tested at speeds up to five (5) mph, with a 35 foot maximum safe turning radius. All components shall remain securely fastened in place and in an operable condition.

4.6.14 Vertical actuator tests. The FA maintenance stand shall be inspected and operated to demonstrate compliance with the requirements of 3.8.3.

4.6.15 Tire/Wheel tests. A FA maintenance stand shall be inspected and operated to demonstrate compliance with the requirements of 3.8.4 through 3.8.4.2.

4.6.16 Rolling force/resistance tests. A FA maintenance stand shall be inspected and operated to demonstrate compliance with the rolling force requirements of 3.8.5.

5. PACKAGING

5.1 Packaging requirements. For acquisition purposes, the packaging requirements shall be as specified in the contract or order (see 6.2). When actual packaging of materiel is to be performed by Department of Defense (DoD) personnel, these personnel need to contact the responsible packaging activity to ascertain requisite packaging requirements. Packaging requirements are maintained by the Inventory Control Point's packaging activity within the Military DoD Agency, or within the Military Department's System Command. Packaging data retrieval is available from the managing Military DoD Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging activity.

6. NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)

6.1 Intended use. The maintenance stand covered by this purchase description is intended for use by maintenance personnel for the servicing of the USAF fleet of aircraft. These maintenance stands are considered general purpose stands that service a wide variety of aircraft and weapons systems. Similar style stands are used by the commercial airlines as access stairways; they are used to board the aircraft / gain access to the wings and fuselage. The military will utilize these maintenance stands as working platforms.

6.2 Acquisition requirements. Acquisition documents must specify the following:

a. Title, number, and date of this purchase description.

b. Classification (see 1.2)

c. If FA inspection is required (see 3.1).

d. Packaging requirements (see 5.1).

INCH POUND

AMSC N/A

FSC 1730

Distribution Statement A. Approved for public release; distribution is unlimited.

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