overwing aircraft semitrailer. These semitrailers travel over primary and secondary roads and over limited cross-country terrain.

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MIL-DTL-62180F(AT)

3.3.15 Fire extinguisher. The semitrailer shall be equipped with two fully charged fire

extinguishers each having an UL rating of 40 BC as defined in UL 711. The fire extinguishers

shall be rechargeable (see 4.5.22).

3.3.16 Transportability. The semitrailer shall be transportable worldwide by highway,

rail, water, and shall be roll on roll off transportable in operational configuration with full

payload. The semitrailer shall be transportable without payload by C-130 and larger aircraft.

For air transport, approach shoring may not be used for ramp clearance (see 4.5.23).

3.3.16.1 Lifting and tiedown provisions. The lifting and tiedown provisions on the

semitrailer shall be in accordance with requirements of MIL-STD-209. The semitrailer shall be

able to be lifted with full payload. The semitrailer shall be able to be tied down on any American

railroad car and be transported with full payload designed for this purpose (see 4.5.23.1 and

4.5.23.2).

3.3.17 Upper fifth wheel plate. The upper fifth wheel plate shall be designed for

coupling to a full oscillating and fore and aft-rocking fifth wheel. It shall be of sufficient size to

cover a fifth wheel 36 inches in diameter and shall conform to 49CFR393.70(b) , as applicable to

trailers. The kingpin and its securement shall be adequate to withstand the load imposed by

Trailer On Flat Cars (TOFC) in accordance with M931 of Association of American Railroads. A

greaseless upper fifth wheel plate is preferred.

3.3.17.1 Kingpin. The kingpin shall conform to SAE J700 and be compatible with the

prime movers specified for the semitrailer.

3.3.18 Seals. When fording (see 3.4.7) or operating in mud, sand or snow, seals shall

prevent entrance of foreign matter into bearings which are exposed to contamination during these

operations. All bearing seals shall restrict lubricant leakage. All seals and gaskets shall be

compatible with the product being transported (see table III and 4.5.24).

3.3.19 Brakes. The tanker shall be equipped with service, emergency, and parking brake

systems conforming to subpart C, Federal Motor Carrier Safety Regulations. Service brake

linings shall be non-asbestos in accordance with A-A-52522 (see 4.5.25).

3.3.20 Human factors engineering. The tanker shall be designed and manufactured with

human factors engineering requirements:

a. To be operated and maintained by personnel in the 5% to 95% size, weight, and

strength range in accordance with ISO 3411.

b. Operation of the landing gear locking and releasing by one operator.

c. Operation of the spare wheel removal and stowage mechanism by one operator.

d. Tanker operation and maintenance in nuclear, biological, and chemical protective

clothing.

e. Tanker operation and maintenance in arctic protection clothing (cold weather gear),

per ISO 2860.