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|  MIL-T-62491C
trouble-free performance under severe operating conditions. The engine hour meter shall be
mounted on the cab instrument panel or in the engine compartment in a readable location.
3.4.24 Back-up alarm. The vehicle shall be provided with an audible, pulsating, signaling
device (electric or mechanical) to caution personnel when the vehicle is in reverse gear operation.
3.4.25 Air conditioning. When specified (see 6.2), the vehicle shall be equipped with the
manufacturer's standard air conditioning system. The air conditioning system shall include tinted
windshield and tinted glass.
3.4.26 Front mounted winch. When specified (see 6.2), except for class 10, a winch
assembly, mounted on the front of the vehicle and powered by the manufacturer's standard power
takeoff or powered hydraulically, shall be provided. The winch shall conform to SAE J706. The
winch shall be of the single drum type and shall have one forward and one reverse speed. All
winch controls shall be mounted inside the cab. Winch controls shall be located to provide no
interference with the entrance or exit of the driver. The winch shall have a rated single line pull
capacity of not less than 89 kN (20,000 pounds) pull on the bare drum. The winch line speed on
the bare drum shall be between 4.6 and 9.1 meters per minute (m/min) (15 and 30 feet per minute)
at an engine speed equal to 50 percent of engine governed speed. The winch shall be wound with
not less than 56 m (185 feet) of 16 mm (5/8-inch) diameter, preformed, 6x37, improved plow
steel, independent wire rope core ( IWRC) and shall be equipped with an end chain and hook. An
integral, adjustable, automatic safety brake shall be provided. The winch shall be equipped with a
roller guide. Angles of the winch drive line U-joints shall be not greater than 16.5 degrees.
3.4.26.1 Winch drum guard. A winch drum guard shall be furnished. The guard shall confine
the cable to the area between the drum flanges. The guard shall consist of not less than 6.4 mm
(0.25 inch) vertical side plates, conforming to the outside radius of the drum flanges. Six bars,
9.5 mm (0.375 inch) by 32 mm (1.25 inches), shall be welded to the vertical side plates. Three
bars shall be located on the top and spaced equally on the top radius, and three bars shall be
located on the bottom and spaced equally on the bottom radius. The vertical distance between the
vertical side plates and the drum flanges shall be not more than half the specified cable diameter.
* 3.4.26.2 Front bumper. When a front mounted winch is specified (see 3.4.26), the bumper
shall be mounted forward of the winch. The open area on either side of the winch shall be
covered with a combination step plate and gravel guard. The bumper shall be of either the
channel type or pipe type. When a pipe type front bumper is furnished, the nominal diameter
28
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