Chapter 13: Engine Indication System Flashcards
what is engine pressure ratio?
index of thrust of engine
ratio of exhaust over inlet total pressure
what is tachometer used for?
display of engine RPM
how does N1 speed indication work?
EEC speed transducer supplies channels with N1 speed signal
what does a magnetic pickup sensor do?
counts the blade passing and converts it to RPM (each gear teeth up and down)
how does magnetic pickup sensor work?
conductor exposed to a changing magnetic field due to relative motion of field source
what equipment is paired with the magnetic pickup sensor?
permanent magnetic alternator
how is engine shaft vibration sensed by an accelerometer using a?
Piezo-Electric Transducer
what is airborne vibration monitoring?
vibration rate of LP & HP shaft wrt RPM sensed by various sensors
what does a fuel flow transmitter do?
indicate rate of fuel consumption in kg/hr per engine
measures fuel flow rate downstream of FCU
purpose of HP fuel filter differential pressure indication
identify if filter is clogged with FOD in FCU
when will signal appear for HP fuel filter differential pressure indicator?
inlet pressure > outlet pressure of filter
what does the oil pressure transmitter do?
measures the pressure difference between supply and scavenge lines and indicate reading to cockpit
what does the low oil pressure switch do?
sense pressure difference between supply and scavange lines and indicates on the cockpit
what does the oil quantity transmitter do?
measures the quantity of oil in tank
what does an oil filter differential pressure indication do?
identify if oil filter is clogged with FOD in oil filter housing
when will signal appear for oil filter differential pressure indicator?
when inlet pressure > outlet pressure
what is an oil temperature sensing bulb for?
measure oil temperature, if exceeds limit, engine will shut down
cockpit warning will appear if limit exceeded
what does EGT indicate?
thermal load
what will happen if EGT exceeds red zone?
hot section inspection
how do engine measure EGT?
many probes to average the indication, even if 1 probe fails it will not affect reading
purpose of PITOT tube?
supplies EEC with engine inlet temp and pressure (P2T2)
torquemeter for turboprop & turboshaft indication
turboprop power output: torque & rpm for propeller blades
turboshaft engine output: torque & rpm for main rotor blade
what is used to provide indication for torquemeter?
oil pressure
what does primary, navigation, central display show?
primary: attitude, altitude, speed
navigation: heading & weather
central: engine, systems data, crew alert msg
what is used to measure EGT?
thermocouple
