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|  MIL-T-62518A
3.3.8 Position stability (aerial platform). When the vehicle is on a 5 percent grade, without
leveling the vehicle, the elevating and rotating mechanism shall hold the loaded aerial platform
(see 3.6.5) in any extended position within 25 mm/hr (1 inch per hour) horizontal creep and
50 mm/hr (2 inches per hour) vertical settling. The creep and settling shall be measured at the
front of the aerial platform with hydraulic fluid stabilized at ambient air temperature.
3.4 Chassis components.
3.4.1 Engine. The engine furnished for the specified vehicle class shall be the chassis
manufacturer's standard or optional engine for the commercial model truck which meets or
exceeds the requirements of this specification.
* 3.4.1.1 Diesel engine. Unless otherwise specified (see 3.4.1.2), the vehicle shall be equipped
with a liquid cooled, compression ignition, two-stroke or four-stroke cycle diesel engine, with
not less than six cylinders. Engine net power figures used in performance prediction calculations
shall be determined in accordance with SAE J1349. The engine shall demonstrate the
performance characteristics specified herein when using diesel fuel conforming to VV-F-800. In
addition, when specified (see 6.2), the engine shall operate satisfactorily on grade JP-4 and
grade JP-5 fuel conforming to MIL-T-5624 under emergency, short duration conditions and on
grade JP-8 fuel conforming to MIL-T-83133 under normal conditions. A power loss when
operating on JP-4, JP-5 or JP-8 is acceptable.
* 3.4.1.2 Gasoline engine. When specified for model 4x2 (see 6.2), the vehicle shall be
equipped with a liquid cooled, internal combustion, four-stroke cycle gasoline engine with not
less than six cylinders. The engine furnished shall produce the required vehicle performance
when operated on unleaded fuel with a research octane rating of 91, at an engine speed not more
than the manufacturer's recommended operating speed. The engine shall be capable of warranted
operation on unleaded fuel, when used in accordance with the operator's manual. Engine net
power figures used in performance prediction calculations shall be determined in accordance
with SAE J1349. Unless otherwise required by foreign laws, vehicles for overseas shall be
capable of accepting and operating on leaded gasoline.
3.4.1.3 Oil filter. A full flow type oil filter shall be furnished.
3.4.1.4 Governor. An engine governor shall be furnished and set and sealed to limit the
engine to the engine manufacturer's maximum recommended operating speed.
* 3.4.1.5 Cooling system. The cooling system shall maintain the engine coolant at a
temperature below the boiling point with the vehicle loaded to rated GVW and operated at an
altitude of 3050 meters (m) (10,000 feet) above sea level or in an ambient air temperature of not
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