Engine Starting Flashcards
What is the method air turbine starter?
Low-pressure air motor
How is the gas turbine engine started?
Rotary power input to the main accessory gearbox, which turns the compressor.
How is the engine started on dual spool arrangements?
Through rotation of the high compressor only.
What is the disadvantage of electric starters?
Reliance on electrical power, meaning if battery power is low, the appropriate torque may not be achieved.
What is the high-energy ignition system?
High voltage solid-state generator that is used for ignitor plug spark generation.
It is used automatically during start-up and automatically during an inflight relight procedure at high altitudes.
What is the input and output voltage of the high-energy ignition unit?
Input: 18 to 32 volts DC
Output: 3000 volts
What is the start sequence of a gas turbine engine?
Fuel on, Engine lights up, Engine attains self-accelerating speed, ignition off, starter cuts off, engine attains idle rpm
What is a wet start malfunction?
Fuel to early
Lack of turbine temp rise
Risk of hot start/tailpipe fire
Fuel off purge engine
What are the hot start causes and indications?
Fuel too early or too much Starter to slow (low battery) Over temp turbine damage Should fuel off monitor engine
What are hung start causes and indications?
Insufficient fuel No ignition happening starter to slow RPM rise to slow High or rapidly rising EGT Should abort the start
How can tailpipe fires occur?
Caused from a wet start
Leftover fuel in the combustion chamber
Early start with no igniters
Wet combustion chamber and turbines
What could prevent the tailpipe fire?
Fuel off and monitor
What are compressor stall/surge indications?
RPM degradation or fluctuation
EGT rise
Loud bang
Engine may shutdown
What are actions the pilot should take in the event of a compressor stall/surge?
Close throttle
Pull E handle
QRH
Report incident
What are indications of a Flameout?
Temperature and RPM drop
Flames
