Q: Master warning panel and EICAS messages? A: #1 AND #2 ENG OUT, FIRE, LOW ROTOR, FUEL PRESS, ENG CHIP, ENG OIL TEMP, ENG OIL PRESS, FUEL FILTER BP, OIL FILTER BP, ENG CONT POWER, ENG STARTER, INLET AI ON, ENG ANTI-ICE ON.
Q: Horsepower? A: 1662 shaft horsepower max continuous, 1800 intermediate, 1940 contingency power on (the take home is that there is about a 7% increase between continuous and intermediate and about a 7% increase between intermediate – first times limit – and w/ contingency power on).
Q: Inlet Particle Separator (IPS)? A: Particles are moved outboard after the inlet vanes and discarded through a collection scroll. A Blower driven by the accessory module moves the particles through the discharge tube and out the exhaust located under the ejectors (the take home is that these are robust engines that can continue to perform in a FOD rich environment).
Q: Gas producer components (Ng)? A: 6-stage axial compressor, 1-stage centrifugal compressor (forward of the hot section) and a 2-stage gas producer turbine (aft of the hot section) which drives the compressors.
Q: Power turbine rotors (Np)? A: 2-stage power turbine rotors aft of the 2-stage gas producer turbine which drives the gearbox and rotors.
Q: Power control levers (PCLs)? A: Controls the power available spindal through a mechanical linkage.
Q: Fuel selector levers (FSLs)? A: Controls fuel to the respective engine through a mechanical linkage with three positions off, direct and crossfeed. Due to residual fuel in the lines (valve secured fuel at the main cell) it takes several seconds for the engines to secure after you move the FSL to off.
Q: Emergency off T-handles? A: Provides a lighted indication of an engine fire and, when pulled, the T-handle moves the FSL to off and arms the fire extinguishers.
Q: Rotor brake interlock? A: Prevents the PCLs from being advanced to fly with the rotor brake on. There is an override button between the PCLs. The engagement of this interlock is the mechanical click heard in the cockpit when the battery is turned on.
Q: Engine accessory module oil sub-systems? A: Oil pressure scavenge pumps, oil filter, fuel/oil heat exchanger (oil cooler), oil pressure and oil temp sensors and a chip detector.
Q: Engine accessory module pneumatic sub-systems? A: IPS blower and the engine starter.
Q: Engine accessory module electrical sub-systems? A: Engine driven alternator (powers the DECU, Ng indications and the engine ignitors).
Q: Eng fuel prime procedure? A: Fuel prime is part of a three-position switch (APU boost, off and fuel prime). The PCLs must be in lockout and the FSL in XFD or DIR.
Q: Engine driven fuel boost pump? A: Powered by the engine accessory module the pump provides fuel to the engine regardless of the electric fuel boost pumps operation. The engine driven fuel boost pump includes a switch that monitorspressure after the pump. Low pressure illumnates the FUEL PRESS caution.
Q: Fuel filter? A: Filters fuel coming from the pump. The filter includes an impending bypass button and a switch which illuminates the FUEL FILTER BYPASS caution when the pressure differential at the filter indicates a bypass (18 PSI).
Q: Hydromechanical unit (HMU)? A: Provides fuel metering and normal fuel cutoff (PCLs off). Also provides output (mechanical) to the variable stator vanes and start bleed valve. It receives mechanical inputs from the PCLs (PAS) and collective (LDS).
Q: Fuel/oil heat exchanger? A: Cools oil and heats fuel for better atomization.
Q: Overspeed and drain valve? A: Protects power turbine section (Np) from overspeed and hot starts by securing fuel to the fuel injectors (both functions controlled by the DECU). Drains fuel from the injectors following engine shutdown.
Q: Fuel injectors? A: 12 injectors located in combustion section provide proper spray pattern for combustion.
Q: Engine oil pump? A: Driven by the engine accessory gearbox. The pump has 1 supply and 6 scavenge elements.
Q: Engine oil filter? A: Mounted on the engine accessory gearbox the filter has an impending bypass indicator that cannot be reset unless the filter is inspected (opened/removed). It has a switch that will indicate and ENG OIL BYPASS caution.
Q: Cold oil relief valve? A: Located on the engine accessory gearbox, the cold oil relief valve relieves back pressure on the system. Relief valve operates at 120-180 PSI (should prevent damage to the engine lubrication system on cold start ups).
Q: Chip detector? A: Monitors scavenge oil from the main sumps not the engine accessory gear box. Illuminates the engine chip cautions.
Q: Oil cooler by pass valve? A: This valve returns high pressure oil directly back to the reservoir bypassing the fuel/oil heat exchanger and protecting the oil cooler from excessive pressure (decreases warm up time – NOT the same as the cold oil relief valve).
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