(d)
Electrical Control Unit- The ECU functions primarily as an engine governor endeavoring to maintain power turbine and main rotor speed constant at 100%. The ECU adjusts the engine power level through the HMU, via torque motor inputs. Three ECU functions: TGT limiting, Np Governing, and Load Share, affect engine power levels through the torque motor, HMU link, and one ECU function (Np overspeed protection) effects the engine power level through the overspeed solenoid and POU link. The pilot can disable all ECU/HMU functions by locking out the torque motor authority (ECU lockout); ECU/POU functions (Np overspeed protection) are not affected by lockout. An INCR/DECR switch on each collective stick allows the pilot to set the Np reference within both ECU's between 96% - 100%, which is normally set at 100%.
ECU malfunctions can range from high side or low side failures which can cause increasing or decreasing RPM R scenarios, partial high or low side failures resulting in a torque split, or an oscillation of engine power from low to high continuously. An ECU malfunction will not cause flame out, and all ECU malfunctions can be countered through PCL "lockout" or "retard". The engine controls are designed to retain full engine control in the event of a loss of all electrical systems. Lost ECU inputs can be replaced manually via PCL movements, while mechanical Ng governing systems (within the HMU) remain operational to limit various fuel flow parameters.
b. Switches/Lights/Gauges/Controls- Switches, lights, gauges, and controls located in the cockpit are additional components related to the engine.
(1)
Upper Console- The engine related switches located on the upper console are:
(a)
APU Control Switch
(b)
Heater Switch
(c)
Air Source Heat/Start Switch
(d)
Engine Anti-Ice Switches
(e)
Prime Boost Pump Switch
(2)
Engine Control Quadrant- On the Engine Control Quadrant, related switches and controls include:
(a)
Start Override Switch
(b)
Start Abort Switch
(c)
Start Switch
(d)
Fuel Selector Lever
(e)
Power Control Lever
(3)
Instrument Panel- An engine related switch located on the Instrument Panel is the ignition switch. Additional engine related lights, gauges, and switches are located on the caution/advisory panel, CDU, PDU, and master warning panel.
(4)
Caution/Advisory Panel- The Caution/Advisory Panel has advisory and caution lights designated to the engines.
(a)
Advisory Lights include: #1 and #2 ENG ANTI-ICE ON, #1 and #2 ENG INLET ANTI-ICE ON.
(b)
Caution Lights include: #1 and #2 FUEL PRESS, #1 and #2 ENGINE OIL PRESS, #1 and #2 ENGINE OIL TEMP, CHIP #1 and #2 ENGINE, #1 and #2 ENGINE STARTER, #1 and #2 OIL FLTR BYPASS, and #1 and #2 FUEL FLTR BYPASS.
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