1、INCH-POUND A-A-59716 May 21,2002 COMMERCIAL ITEM DESCRIPTION (CID) STAIRCASE, AIRCRAFT BOARDING CHASSIS MOUNTED, MOTORIZED (MSTA) 1. SCOPE. This document covers a commercial, diesel engine driven, chassis-mounted, aircraft boarding staircase, to be used for passenger loading and unloading. The deck
2、height of the staircase is adjustable to between 96 inches and 228 inches to accommodate B-707, B-727, B-737, B-747, B-757, B-767, B-777, A-300, A-320, A-330, A-340 aircraft, and their military derivatives. 2. SALIENT CHARACTERISTICS. 2.1 General. The aircraft staircase shall be constructed in accor
3、dance with the requirements of SAE ARP 1247, “General Requirements for Aerospace Ground Support Equipment, Motorized and Nonmotorized,” SAE ARP 836, “Design and Safety Criteria for Passenger Boarding Stairways,” and this document. In the event of a conflict between either ARP 1247 or ARP 836 and the
4、 text of this document, this document shall take precedence. Nothing in this document, however, supercedes applicable laws and regulations, unless specific exception has been obtained by the procuring agency. 2.1.1 Standard Commercial Product. The aircraft staircase, as a minimum, shall be in accord
5、ance with the requirements specified herein and shall be the manufacturers standard commercial product. Additional or better features which are not specifically prohibited by the specification, but which are part of the manufacturers standard product, shall be included in the unit being furnished. A
6、 standard commercial product is a product that has been sold or currently offered for sale on the commercial market through advertisements, manufacturers catalogs or brochures, and represents the latest production model. The aircraft staircase shall have been previously accepted by demonstrated sati
7、sfactory performance of boarding passengers in commercial and/or USAF Military Aircraft. 2.1.2 The aircraft staircase shall be operable by a single person. It shall be maintainable with standard tools and built with parts from commercial sources. Beneficial comments, recommendations, additions, dele
8、tions, clarifications, etc. and any data that may improve this document should be sent to: 295 Byron Street, WR-ALC/LESVS Robins AFB, GA 31098-1611 DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. AMSC N/A FSC 1730 Provided by IHSNot for ResaleNo reproduction or netw
9、orking permitted without license from IHS-,-,-A-A-59716 2 2.2 Components. The chassis-mounted aircraft staircase shall consist of the following major components: Item or System Name See Characteristic Chassis 2.5 Frame 2.6 Height adjustment system 2.7 Lighting System 2.8 2.3 Design and Construction.
10、 The staircase unit shall be built to withstand the strains, jars, vibrations, and other conditions incident to shipping, storage, and service. It shall be so designed and constructed that no parts work loose in service. 2.3.1 Maintainability. The staircase unit shall be designed and constructed as
11、specified herein and shall comply with the following: a. There shall be a minimum number of parts consistent with reliability and performance specified herein. b. The staircase unit shall allow adjustments, servicing, maintenance, and replacement of parts and components with minimum disturbance to o
12、ther equipment, parts or components. Parts and components shall be positioned for access and ample working space shall be provided, unless performance or reliability is appreciably degraded by the access location. In performing maintenance, if engineering reasoning or data determines that physical o
13、r visual interference between items cannot be avoided, the item predicted to require the most maintenance shall be provided primary access. c. Routine maintenance shall be performable with common tools and equipment available commercially. Special purpose tools and equipment shall be identified. Pro
14、vision of special purpose tools and equipment shall be subject to approval by the procuring agency. d. A minimum number of tools shall be required for maintenance by design practices, such as reducing the variety of bolt head sizes. 2.3.2 Access to Passenger Entrance. The staircase shall be designed
15、 to provide a safe means of access to the passenger entrance of the aircraft. The top platform shall be adjustable to all heights above ground level within the range of 96 inches to 228 inches. 2.3.3 Ramp aircraft mating. The ramp adjustment provisions shall be designed so that the staircase top pla
16、tform shall mate with the aircraft passenger door opening at any height within the required operating range without forming a step or gap of more than two (2) inches between the doorsill of the aircraft and the top platform. The platform side panels shall not strike the side of the aircraft serviced
17、 by this staircase or form a gap between each side panel and the aircraft of more than three (3) inches when adjusted for the aircraft being serviced. The side panels shall lock in position with positive-type lock and hands-free operation. Provided by IHSNot for ResaleNo reproduction or networking p
18、ermitted without license from IHS-,-,-A-A-59716 3 2.3.3.1 Top platform side panel rollers. If rollers are utilized on the top platform side panels, the rollers shall be configured to conform to the shape of the track on which they operate and shall be of sufficient depth to prevent the rollers from
19、coming off the track. 2.3.4 Wiring. The electrical wiring system shall be of a standard commercial, outdoor, weatherproof construction including wire, junction boxes, fixtures, and wired receptacles in accordance with ARP 1247. All 110V circuits shall be in accordance with NFPA 70. The wire shall be
20、 of adequate rating for the power load imposed and shall be securely mounted throughout the staircase. 2.3.5 Lifting system The staircase shall be provided with means to enable the stairway to be lifted from the chassis. If lifting eyes are used the inside diameter of each lifting eye shall not be l
21、ess than two (2) inches. A minimum safety factor of 3:1 shall be applicable for the lifting system, based on the weight of the staircase unit. 2.3.6 Drainage provisions. The staircase shall include provisions for the continuous drainage of water from the steps, platform, structural members, and othe
22、r components. 2.3.7 Air transportability. The completely assembled staircase shall be air transportable in a type C-5 and C-17 cargo aircraft. MIL-HDBK-1791 and MIL-STD-1366 shall be used as references. Additional information will be provided by the procuring agency upon request. 2.3.7.1 Restraints.
23、 Aircraft cargo compartment restraint instructions shall be furnished. Restraint provisions must be marked with capacities and in sufficient number and location to restrain the unit to the requirements of MIL-HDBK-1791, i.e., 3G forward, 2G vertical (up) and 1.5G aft and lateral. In addition, all st
24、ored or installed equipment must meet these same requirements and all components must be capable of withstanding a vertical (down) load of 4.5G. 2.3.7.2 Ground clearance. The staircase shall have a minimum ground clearance of six (6) inches. 2.4 Performance. The staircase shall withstand the followi
25、ng conditions without detrimental effect to subsequent operation: a. Operation in ambient temperatures ranging from +125 Fahrenheit (F) to 20 F. When specified (see 6.2-a.) a winterization package, consisting of heaters for engine coolant, oil pan, and transmission, as well as battery warmers shall
26、be provided for operation in temperatures down to -40 F. The optional winterization system shall be designed to operate from an external 110-volt AC power source. b. Stable with wind velocities specified in subsection 4.3 of ISO 11995, while stairs are fully extended. The horizontal movement of the
27、top platform shall not exceed 1-5/8 inches in either director. c. Continuous 25 mph operating velocity on horizontally level surface. 2.4.1 Concentrated load. Each step and the top platform of the staircase shall withstand a concentrated load of 500 pounds on any square foot. Provided by IHSNot for
28、ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59716 4 2.4.2 Total static load. The fully extended staircase, unsupported by aircraft contact, shall withstand a combined static load of 250 pounds on each step and 1,000 pounds on the platform. The total deflection the
29、staircase platform shall be less than one (1) inch from the unloaded to fully loaded condition. 2.5 Chassis. The staircase chassis shall be either a commercial truck chassis or a chassis designed and built specifically by the staircase unit manufacturer. If a commercial truck chassis is provided, mo
30、difications to satisfy requirements herein shall be accomplished by the staircase manufacturer. If a chassis specially built for the staircase unit manufacturer is provided and a cab is specified (see 6.2-b.), a one-man cabin compartment shall be provided. The chassis shall include: 2.5.1 Diesel eng
31、ine. The staircase unit shall be diesel engine driven. It shall be capable of satisfactory operation with fuels JP-4, JP-5, and JP-8. 2.5.2 Batteries. Battery power shall be sufficient to start engine after two hours of continuous platform and stair light operation. 2.5.3 Cooling system. The cooling
32、 system shall withstand ambient temperatures between +125 F and -40 F and 100% relative humidity. 2.5.4 Alternator. The alternators output at idle shall provide the continuous electrical load of the staircase. 2.5.5 Transmission. The driveline shall include an automatic transmission. 2.5.6 Tire trea
33、d. Tires shall be of all-season radial design. 2.5.7 One-man cab. When specified (see 6.2-b.) an enclosed one-man cabin shall be provided. Interior cab sound level shall not exceed 85-dBA with door(s) and windows closed. Cab instrumentation shall be of standard commercial installation and shall incl
34、ude: an hour meter, fuel gauge odometer, tachometer, and speedometer. Cab shall be equipped with wipers, mirrors, visors, heater/defroster, ventilation fan, interior light, and other equipment as found in standard commercial offering. 2.5.8 Roof window(s). To facilitate positioning of the staircase
35、at the passenger entrance of the aircraft, from the drivers seat of the cabin compartment, an unobstructed view shall be provided of the entire underside of the mating area of the staircase/aircraft. 2.6 Frame. The staircase frame shall be so constructed as to provide rigid support for personnel tra
36、versing the stairs. 2.6.1 Steps. Each step shall be at least 42 inches wide. Riser heights and tread depths shall be in accordance with ARP 836B, Table 3, for fixed riser type steps. The step treads shall not deviate more than three (3) degrees from the horizontal, regardless of platform elevation.
37、Step risers shall connect the front of each step with the rear of the next lower step at each platform height within the operating range. Step and step riser design shall insure that usable tread has a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
38、A-A-59716 5 minimum depth of nine (9) inches. The top step shall be made in the form of a platform. The width of the platform shall be at least the width of the steps and the length shall be at least 58 inches. For other than loading operations, the bottom step shall be designed such that it can eas
39、ily be positioned to provide the ground clearance specified in 2.3.7.2. 2.6.2 Non-slip surfacing. The steps and top platform shall be drainable, aluminum diamond-plate or comparable non-slip design having a minimum average slip resistance of 0.68 when measured in accordance with ASTM F 1679 on a wet
40、ted surface. 2.6.3 Handrails. Handrails shall be provided on each side of the staircases, and shall extend from the base of the stairs to the aircraft end of the top platform. Handrail heights shall conform to SAE ARP 836, Table 3. The handrails shall maintain a constant height above the steps at al
41、l platform heights within the operating range of the staircase. The handrails on the top platform shall also maintain a constant height, but may be a different height than the stair handrails. The handrails on the platform shall allow opening and closing of the aircraft entrance doors with the stair
42、case in place. Both stair and platform handrails shall withstand a horizontal load of 200 pounds applied outward to the top of the handrail at any point, without damage or permanent deflection. 2.6.4 Siding. Durable siding shall be provided and shall extend upward a minimum of five-eights the distan
43、ce from the steps to the handrails and five-eights the distance from the bottom to the top of the platform side panels. It is preferred that the durable siding on the platform side panels be at least seven-eights the vertical height of the panels. 2.6.5 Bumpers. A Tubular rubber bumper shall be secu
44、rely fastened to the front of the top platform to protect the aircraft from possible damage when the staircase is firmly positioned against the aircraft. Durable bumpers shall also be fastened on the front of the platform side panels to protect the aircraft from damage when the panels are extended a
45、nd positioned against the aircraft. 2.7 Height adjustment system. A hydraulic height adjustment system shall be provided to elevate and lower the staircase through its entire operating range. The system shall be designed to operate the unloaded staircase from the lowest to the highest position in ei
46、ther direction in a maximum of two (2) minutes. The system shall conform to SAE ARP 1247, section 3.13.1.3; with the exception of 3.13.1.3.12 provided o-ring face seals are used. Relief values, preset to release at no lower than 125% of normal operating pressure of the circuit, shall be provided. Th
47、e system shall show no leaks or breakage when the staircase is subjected to the loads specified in 2.4.2. When so loaded, the platform shall not settle more than a half an inch in height in a four-hour period. Operating controls shall be provided on the instrument panel within the operators compartm
48、ent to allow for raising and lowering the stairs. Positive removal stops shall be provided to prevent over extension of the upper ramp assembly. A non-hydraulic height adjustment system shall require approval of the procuring agency. 2.7.1 Actuating Pump. Height adjustment power shall be furnished b
49、y a hydraulic pump, which is directly driven by the chassis engine. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59716 6 2.7.2 Hydraulic reservoir. The storage tank shall have a capacity of not less than 110 percent of the fluid required to operate the hydraulic system. The tank shall be equipped with a fluid level indicator, a drain plug, and an air vent. The hydraulic system and tank shall be fitted
