Engines Flashcards
Type of engine? 737-700
CFM56-7
What are the five sections of the engine?
Fan section
Compressor section
Combustion section
Turbine section
Exhaust
Pneumatic airbus taken from the ____ and ____ we of the _____ pressure compressor
5th and 9th stages of the high pressure compressor
The accessory drive is located on the ____ side of the engine and includes what items?
Left side
Oil scavenge pump
Engine fuel pumps
IDG
Starter
Hydraulic pump
What is the EEC?
Electronic engine control
Aka FADEC
There are ___ EECs per engine, with each EEC having __ modes.
One per engine
Two modes per EEC
The EEC interfaces with what engine components?
Hydro mechanical unit to meter correct amount of fuel into the engines
Engine air control systems to change variable stator vane angles and bleed air valves
Fuel flow transmitters
Ignition and starting system
Thrust reversers
The EEC has how many control modes? What are they?
Two
Normal and alternate (soft/hard)
How do you know if the aircraft is in soft vs hard alternate EEC modes?
If the ON and ALTN are both illuminated, you’re in soft alternate.
If only the ALTN mode is illuminated, you’re in hard alternate
How do you switch from soft to hard alternate mode?
Retard thrust lever to idle or push the respective EEC button
How does the soft alternate EEC mode determine engine parameters?
Uses the last valid flight conditions
T/F: If an engine reverts to the alternate mode, non-normal procedures will direct BOTH engines to operate in the alternate mode for the duration of the flight
True
What does the hard alternate mode do?
Always provides equal to or greater thrust than the normal mode for same lever position
What does the illuminated ENGINE CONTROL light mean?
These lights only operate on the ground and indicate that the aircraft is not to takeoff due to engine control system malfunctions
Active below 80 kts prior to takeoff and approximately 30 seconds after touchdown
What are the three “idle settings” and when are they active?
Ground idle. Active for ground operations
Flight idle: Active in flight when approach idle isn’t active
Approach idle: Active in flight with flaps in landing configuration or either engine anti ice is selected on. N1/N2 will be higher than flight idle to reduce acceleration time in the event of a go around.