Loader's and commander's hatches

Page Title: Loader's and commander's hatches
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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).

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