MIL-T-45379 Tank, Combat, Full-Tracked, 105 Mm Gun, M60A3-TtsThis specification establishes the construction, performance and inspection requirements for M60A3 full-tracked combat tank equipped with a Tank Thermal Sight TTS.

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MIL-T-45379D(AT)

3.3.13 Hatches.

3.3.13.1 Driver's hatch. The force required to breakaway and slide the driver's hatch cover across the opening shall not exceed 50 pounds force foot (lbf ft) at the handle. The force

required to lock the driver's hatch cover in the closed position shall not exceed 75 lbf ft at the end

of the locking lever (see 4.6.2.13.1).

3.3.13.2 Driver's escape hatch. The force required to operate the handle to release the driver's escape hatch shall be 50 + 10 lbf ft pull at a point 0.5 inch from the end of the handle (see 4.6.2.13.2).

3.3.13.3 Loader's and commander's hatches. With the hatch closed, the force required to unlock the hatch shall not exceed 20 lbf ft. With the hatch unlocked, the force required to push hatch to its extreme open-latched position shall not exceed 55 lbf ft measured at the hatch closed lock handle. The force required to unlock hatch from an open latch position and rotate to the balanced position shall not exceed 60 lbf ft at the end of the hatch opened lock handle. To lock the hatch in the closed position with the hatch closed lock handle, the downward force shall not exceed 50 lbf ft and the rotational force shall not exceed 20 lbf ft at the end of the handle

(see 4.6.2.13.3).

3.3.14 Seats.

3.3.14.1 Driver's seat. With the driver in seated position, the force required to actuate the fore and aft seat adjustment lever shall not exceed 12 lbf ft at the end of the lever. With the driver's seat vacated, the force required to actuate the seat vertical adjustment lever shall not exceed 14 lbf ft at the end of the lever. The force required to trip the seat dumping lever shall not exceed 14 lbf ft at the end of the lever. The driver's seat shall move forward, backward and vertically when the appropriate levers are actuated. There shall be no restriction of movement except with the seat in its lowest position (see 4.6.2.14.1).

3.3.14.2 Gunner's seat. With no load on the seat, the force required to pull the seat adjusting pin shall not exceed 15 lbf ft. The spring shall raise the seat not less than 7 inches without personnel seated (see 4.6.2.14.2).

3.3.14.3 Commander's platform seat and upper swing seat. With no load on the seat and platform assembly, the platform seat shall be capable of sliding upward at least 12 inches with the spring force provided. With no load on seat, the force required to lift the pin for seat adjustment shall not exceed 25 lbf ft measured at end of the lever. The platform latch shall lock securely in up position. The backrest shall be retained in a vertical position when not used as a platform. The seat shall be retained in a vertical position when not being used. The force required to position the seat pin for seat release shall not exceed 15 lbf ft measured at the end of the lever. The force required to rotate the upper swing seat shall not exceed 10 lbf ft when applied to the extreme edge of the seat (see 4.6.2.14.3).