| Governor Switches : The pilot or gunner GOV switches AUTO
position, permits the overspeed governor to automatically control fuel
metering and engine speeds ( N1 and N2 ). The EMER position permits the
pilot and gunner to manually control the engine rpm. The governor
circuit is powered by the dc essential bus and protected by the GOV
CONTR circuit breaker. |
| Fuel Switch : The pilot FUEL switch, FUEL position
energizes the forward and aft boost pumps, opens the fuel shutoff valve,
and completes the ignition and start fuel circuit. The aft fuel boost
pump circuit is powered by the dc essential bus. The other circuits are
protected by the START RLY, IGN SOL, FUEL/OIL VALVE, FUEL BOOST FWD, and
FUEL BOOST AFT circuit breakers. |
| Engine Oil Bypass Switch : The pilot ENG OIL BYP switch, AUTO
position permits the oil to automatically bypass the oil cooler when the
oil tank is approximately 3.8 quarts low. The OFF position deactivates
the automatic bypass feature causing the oil to pass through the oil
cooler regardless of the oil tank level. The switch circuit is powered
by the dc essential bus and protected by the FUEL OIL VALVE circuit
breaker. |
| Engine Deice : The pilot ENG DEICE switch is placed in the
DEICE position. This action causes the hot air solenoid valve to route
engine bleed air to the engine air inlet. A rise in the turbine
gas temperature (TGT) will occur when the pilot or gunner ENG DEICE
switch is in the DEICE position. De-ice operation will become
continuous if the hot air solenoid valve (ENG DEICE) circuit fails or if
ENG DEICE circuit breaker is out (extended). |
| RPM Warning Switch : The pilot RPM switch, OFF position
prevents audio warning from functioning for engine starting when the
audio might be objectionable. The switch automatically resets to WARNING
position when the engine and rotor reach normal rpm. |
| Hydraulic Test Switch : The pilot HYD TEST switch is used to
test the No.1 and No.2 hydraulic systems. Holding the switch in the SYS
1 position will cause the No.1 system to be the only system supplying
hydraulic pressure. Similar action occurs when the switch is held in the
SYS 2 position. |
| Force Trim Switch : Placing the FORCE TRIM switch in the FORCE
TRIM position will induce artificial feel into the systems. Depressing
the cyclic stick force trim switch will cause the magnetic brake and
force gradient to be repositioned to correspond to the positions of the
cyclic stick and pedals thus providing trim. The system is powered by
the dc essential bus and protected by the FORCE TRIM circuit breaker. |
