MIL-DTL-62270B(AT)
shall not exceed 25 lb at a point just below the knob to actuate the valve through a minimum of
0.69 in. travel (see 4.7.1.16).
3.4.1.18.2 Escape hatch release. The force required to operate the handle to release the
escape hatch shall be 50 + 10 lb pull at a point 0.5 in. from the end of the handle (see 4.7.1.17).
3.4.1.18.3 Operator and assistant operator seat. With the operator or assistant operator
in seated position, the force required to actuate the fore and aft seat adjustment lever shall not
exceed 12 lb at the hand grip. With the seats vacated, the force required to actuate the seat
vertical adjustment lever shall not exceed 14 lb at the hand grip. The force required to trip the
seat dumping lever shall not exceed 14 lb at the hand grip. The seats shall be movable forward,
backward and vertically when the appropriate levers are actuated (see 4.7.1.18).
3.4.1.18.4 Fuel shutoff valve. The engine shall stop firing and rotating within a maximum
of 30 seconds after the manual fuel shutoff valve is actuated to the "OFF" position (see 4.7.1.19).
3.4.1.19 Fire extinguisher. The fixed fire extinguisher system, when installed in
accordance with applicable drawings, shall be readily accessible for operation internally or
externally. Actuating the internal control shall simultaneously stop the supply of fuel to the engine
and discharge the extinguisher. Actuating the external control shall discharge the extinguisher,
but not stop the fuel supply to the engine. The effort required to discharge the system either
internally or externally shall be not more than 55 lb. A time delay of more than 6 seconds but less
than 11 seconds shall occur on the first shot between actuation of the release mechanism and
entrance of carbon dioxide (CO2) into the engine compartment (see 4.7.1.20).
3.4.1.20 Personnel heater. The placement of the heater ignition switch in either "high" or
"low" position run mode shall cause the blower motor to operate at low speed and the heater to
ignite within 4 minutes. Subsequent to ignition, the placement of the heater switch in the "high"
position run mode shall cause the blower motor to operate at high speed. The placement of the
heater switch in the "off" position mode shall cause the burner to extinguish and the blower motor
to shut off within 3.5 minutes (see 4.7.1.21).
3.4.1.21 Smoke discharging systems.
3.4.1.21.1 Engine smoke generator. The chassis shall discharge smoke from both exhaust
pipes when the engine is running and the smoke generator switch is in the "ON" position
(see 4.7.1.22).
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