Oral Bank - ENGINES Flashcards
In the normal mode, what does the EEC use as the controlling parameter for the GE engines? PW engines? (2)
- N1 for GE
- EPR for PW
What protection features are provided in the EEC Normal mode? (3)
Thrust limiting
Maintains constant thrust
Over-speed protection
What occurs with the auto-throttle system when any EEC control is switched to alternate mode?
The A/T’s disconnect, but can be reconnected when all EEC’s have been switched to alternate mode
What EEC normal mode protection feature is not available in EEC alternate mode?
Thrust limiting at MAX N1
When does the EEC select approach idle? (4)
- Nacelle anti-ice is ON
- Flaps in a landing position
- Continuous ignition switch ON
- During thrust reverse operation
What action should be taken prior to manual selection of the EEC alternate mode?
Decrease thrust lever position
What happens when you turn the continuous (CON) IGNITION switch on? (2)
- Selects igniters to operate continuously
- Commands approach idle minimum
What two engine indications are displayed full time on the Primary EICAS on a GE?
- N1
- EGT
What colour does the EGT change to if the EGT start or T/O limit is reached?
Red
If the airborne vibration monitoring system cannot be determine the source of the vibration it will display ‘BB’. What does this mean?
Broadband (broadband vibration is the average vibration detected)
What 3 items will the autostart system protect the engine from during engine start?
- Hot start
- Hung start
- No EGT rise
How is the engine thrust reverser actuated on the GE engine?
Pneumatically actuated fan air
How is the engine thrust reverser actuated on the PW engine?
Powered by hydraulic pressure from the related hydraulic system to actuate the fan air thrust reversers
How is the engine thrust reverser actuated on the GEnx B747-8 engine?
Hydraulically actuated fan air
With an engine shut down, what does “X-BLD” indicate when displayed next to the N2 indication?
Crossbleed air is recommended for in-flight start
When is ignition selected for all engines? (2)
- Trailing edge flaps are out of the up position
- Continuous ignition ON
How many ignitors are selected for ground start and how many for in-flight start?
- One for ground start
- Two for in-flight
What are the PW engine warm up requirements for oil temp before takeoff?
Above the lower amber band
GENX2B67 engine EEC’s command ice crystal anti-ice when ice crystal icing conditions are detected at altitudes higher than?
30,000ft
GENX2B67 engine ice crystal anti-icing cycle continues for ____ minutes as long as ICI conditions are detected or airplane depends below __________ ft?
- 15 minutes
- 28,000ft
When does GENX2B67 engine select minimum or approach idle? (5)
- Engine anti-ice ON
- Landing gear DOWN
- Flaps 20 selected
- Flap in landing position
- Thrust reverser operation
Under what condition on the ground will the GEnx EEC shutdown an engine to provide protection against thrust asymmetry due to a control malfunction? (2)
- Thrust leaver at/near idle, AND
- Engine above command N1 speed and not decelerating normally
During engine start when will the GEnx engine provide additional 40 seconds of motoring time at 20% N2? (2)
- Engine shutdown between 30-360 minutes
- EGT greater than 30 degrees C
During engine start the GEnx engine will attempt corrective action for which conditions? (4)
- Hot start
- Hung start
- No EGT rise
- Compressor stall
