22.214.171.124 Cupola hatch. With the cupola hatch closed, the force required to lock or unlock
the hatch shall not exceed 46 pounds. With the hatch unlocked, the force required to push hatch
to its extreme open-latched position shall not exceed 30 lb. The force required to release the
hatch open-lock plunger shall not exceed 50 lb (see 126.96.36.199).
188.8.131.52 Driver's seat. With the driver in a seated position, the force required to actuate the
fore and aft seat adjustment lever shall not exceed 12 lb 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 lb
at the end of the lever. The force required to trip the seat dumping lever shall not exceed 14 lb at
the end of the lever. The driver's seat shall move forward, backward and vertically when the
appropriate levers are actuated (see 184.108.40.206).
220.127.116.11 Gunner's seat. With no load, the gunner's seat shall be free of binding and
interference throughout the operating range (see 18.104.22.168).
22.214.171.124 Commander's platform seat. With no load on the commander's seat and platform
assembly, the platform seat shall be free of binding and interference throughout the operating
range. The platform latch shall lock securely in the "up" position. The backrest shall be retained
in a vertical position when not used in its functional mode. The seat shall be retained in a
vertical position when not being used (see 126.96.36.199).
188.8.131.52 Loader's seat. When the loader's seat assembly is properly installed and is not in
use, the lifting spring shall be capable of raising and retaining the seat base in a vertical position
3.4.14 Crew compartment system.
184.108.40.206 Radio and intercommunication installation. Provision shall be available (signal,
control and power circuits) for installation of an AN/VRC-12 radio at the commander's station
for external communications. Provision for installation of an AN/VIC-1(V) intercom at each
crew station and the rear fender phone box for internal and external communications shall also
be provided (see 220.127.116.11).
3.4.15 Electrical system.
18.104.22.168 Vehicle electrical.
22.214.171.124.1 Interior lighting. Each crew position shall contain a domelight to provide general
illumination to assist with tasks at night or during closed-hatch operation. The domelight shall
contain provisions for adjusting light intensity and red filter for night vision adaptation. The
lights shall operate as specified through all vehicle operating conditions. All electrical contacts
and connections shall maintain positive contact under all vehicle operation conditions