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)

15 minutes and hold semitrailer-towing vehicle combination stationary on a 20�2 percent

longitudinal slope. Semitrailer's wheels shall not roll when the semitrailer is towed by the prime

mover with application of the brakes still maintained (see 4.5.26.6).

3.4.4.1.2 Parking brake systems. A parking brake system shall be included in the tanker

design which shall automatically apply the semitrailer brakes in the event air pressure in the air

reservoir line fall below specified levels (see 4.5.26.7).

3.4.4.1.3 Brake interlock system. A brake interlock system shall be provided which

automatically sets the semitrailer parking/emergency brakes during fuel bottom loading and

unloading (see 4.5.26.8).

3.4.4.1.4 Automatic slack adjusters. Automatic slack adjusters shall be provided in the

brake system (see 4.5.26.9).

3.4.5 Turning and tracking ability. The semitrailer, when coupled to the prime mover

operating in its minimum turning circle, shall follow without cramping and without damage or

interference to the towed tanker or prime mover (see 4.5.26.10).

3.4.6 Landing gear. Landing gear shall support the fully loaded semitrailer and shall

withstand without damage the force imposed upon it when uncoupling from the coupling to the

towing vehicle and when raising and lowering the fully loaded semitrailer. The landing gear

shall extend and retract, and when retracted, shall provide adequate ground clearance for

cross-country operation. The landing gear of a fully loaded semitrailer shall be able to be raised

and lowered by a single person in the 5% to 95% size, weight, and strength range in accordance

with ISO 3411 (see 4.5.26.11).

3.4.6.1 Ground board. Two ground boards conforming to Drawing 7417585 shall be

provided as a part of the Onboard Vehicle Equipment (OVE). Stowage compartments for the

ground boards shall be provided in the vicinity of the landing legs (see 4.5.26.12).

3.4.7 Fording ability. Semitrailer shall ford salt or fresh water to a depth of 24 in.

without any special servicing or protection before or after fording. No evidence of water leakage

or moisture penetration into sealed wheel bearings or fuel tanks shall be permitted (see

4.5.26.13).

3.4.8 Refueling system.

3.4.8.1 Loading and unloading rates. The loading and unloading rates for specific fuel

and specific semitrailer configurations shall be part of the applicable fueling application

(see tables II, III and 4.5.26.14).

3.4.8.2 Fuel removal. When specified (see 6.2), the fuel tankers shall be capable of

defueling aircraft, automotive fuel tanks and other fuel tankers. All required fittings, hoses, and

equipment shall be provided on the fuel tanker (see 4.5.26.15).