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|  MIL-T-62222(AT)
4.6.12.6 Fuel system, grades and slopes. To determine conformance to 3.4.11.6, the fuel
system on grades and slopes shall be observed during climbing tests (see 4.6.17.2.3 and
4.6.17.2.4).
4.6.13 Hatches.
4.6.13.1 Driver's hatch. To determine conformance to 3.4.12.1, a force gage shall be
attached to the driver's hatch when it is in the closed position and the hatch shall be pulled to the
open position and back to closed position. The force shall be as specified. With the hatch in a
closed position, the force required to lock the driver's hatch cover shall be measured with a force
gage attached to the end of the locking lever and shall be as specified.
4.6.l3.2 Driver's escape hatch. To determine conformance to 3.4.l2.2, 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. After the latching mechanism is released,
the escape hatch shall drop free from the hull. Caution shall be exercised in unlatching the
escape hatch by assuring that the area under the hatch is free of personnel and equipment before
releasing the handle. After performing this test, the shallow water fording test shall be
performed and the hatch checked for sealing ability as specified in 3.4.l.l.
4.6.13.3 Loader's hatch. To determine conformance to 3.4.12.3, using a force gage the
various forces for hatch operation shall be measured as specified.
4.6.13.4 Cupola hatch. To determine conformance to 3.4.12.4, using a force gage the
breakaway forces shall be verified for the directions specified. All characteristics shall be within
the limits specified.
4.6.14 Seats.
4.6.14.1 Driver's seat. To determine conformance to 3.4.13.1, 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.
4.6.14.2 Gunner's seat. To determine conformance to 3.4.13.2, the gunner's seat (no load)
shall be slid through its full range, locked and unlocked, and checked for binding and
interference.
4.6.14.3 Commander's platform seat. To determine conformance to 3.4.13.3, the platform
(no load) shall be slid through its full range, locked and unlocked, and checked for binding and
interference. The seat, also with no load, shall be checked for operability through its range.
4.6.14.4 Loader's seat. To determine conformance to 3.4.13.4, the loader's seat shall be
pulled to the seated position and then released to see if it returns to the vertical position.
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