Loader's and commander's hatches

Page Title: Loader's and commander's hatches
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MIL-T-45379D(AT)

4.6.2.13.2 Driver's escape hatch. To determine conformance to 3.3.13.2, the driver's escape

hatch shall be checked by attaching a force gage to the handle at the point specified, releasing the

latch, and noting that the force required is as specified. Caution shall be exercised in making the

escape hatch check by assuring that the area under the hatch is free of personnel and equipment

before releasing the handle. After performing this test, the shallow waterfording test shall be

performed and the hatch checked for sealing ability as specified in 3.3.1.1.

4.6.2.13.3 Loader's and commander's hatches. To determine conformance to 3.3.13.3, attach

a force gage to the locking latch and measure the force required to unlock the latch. Measure the

force required to push each hatch to its extreme open-latched position. Close the hatch and

measure the downward force required to pull the hatch into a locking position and the rotational

force required to lock the hatch.

4.6.2.14 Seats.

4.6.2.14.1 Driver's seat. To determine conformance to 3.3.14.1, each driver's seat lever shall

be actuated and the seat shall move forward, backward, and vertically as appropriate. A force

gage shall be attached to each lever as specified and the force required to actuate shall be

measured. All sliding parts and operating contact surfaces shall be examined for absence of

paint.

4.6.2.14.2 Gunner's seat. To determine conformance to 3.3.14.2, the gunner's seat (no load)

shall be slid through its full range, locked and unlocked, and checked for the minimum distance

specified. With no load on the seat, the force required to pull the adjusting pin shall be measured

and shall be as specified.

4.6.2.14.3 Commander's platform and upper swing seat. To determine conformance to

3.3.14.3, the platform (no load) shall be slid through its full range, locked and unlocked, and

checked for the minimum distance specified. The seat, also with no load, shall be checked for

operability through its specified range. The force required to release the seat or to rotate it shall

be measured and shall be as specified.

4.6.2.14.4 Loader's seat. To determine conformance to 3.3.14.4, the loader's seat shall be

pulled to the seated position and then released to see if it returns to the vertical position.

4.6.2.15 Fire extinguisher. To determine conformance to 3.3.15, the fire extinguisher shall

be tested for operation. With the engine idling at 700 to 800 rpm, the internal control shall be

pulled with a maximum effort of 55 lbf ft using a force gage. The first shot shall actuate one

bottle. After a delay of more than 6 seconds but less than 11 seconds, the engine shall have

stopped and the system shall begin discharging CO2, into the engine compartment and in the

center of the engine "V". After returning the handle to its original position, a second actuation

shall discharge the remaining two bottles of CO2 Removal and weighing of each CO2 bottle

after test shall show a minimum of 9 lb of CO2 discharged during test.

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