Engines Flashcards
In the normal mode, what does the EEC use as the controlling parameter for GE Engines? PW Engines?
GE - N1
PW- EPR
What protection features are provided in the EEC Normal mode?
Thrust Limiting
Maintains constant thrust
Overspeed Protection
What occurs when the auto-throttle system when any EEC control is switched to alternate mode?
Auto-throttles disconnect, but can be reconnected when all EECs have been switched to alternate mode.
What EEC Normal mode protection feature is not available in EEC Alternate mode?
Thrust limiting at maximum N1 (maximum thrust can be achieved prior to thrust lever position at full forward)
When does the EEC select Approach Idle
- Continuous Thrust Selected
- Flaps in a landing position
- Thrust reverser operation
- Nacelle Anti-Ice is ON
What action should be taken prior to manual selection of the EEC to alternate mode?
Decrease Thrust Lever Position
Note: Thrust does not change when the EEC auto transfer from normal mode to alternate mode.
What happens when you turn on the Continuous Ignition (CON) ON?
-Selected igniters operate continuously
-Commands approach idle
What two engine indications are displayed full time on the Primary ECIAS on a GE?
N1 & EGT
What color does EGT change to if the EGT start or takeoff limit is reached?
RED
If the airborn vibration monitoring system cannot determine a source of vibration (FAN, LPT, NT) it will display BB. What does this mean?
Broadband
- Average vibration detected
What 3 items will the autostart system protect the engine from during an engine start that will also result in an EICAS message?
-Hot Start
-Hung Start
-NO EGT Rise
How is engine thrust reverser actuated on the GE Engine?
Pneumatically actuated fan air
How is engine thrust reverser actuated on the PW Engine?
Powered by hydraulic pressure from the related hydraulic system to actuate fan air thrust reversers.
How is engine thrust reverser actuated on the GEnx 747-8?
Hydraulically actuated fan air.
With an engine shut down, what does “X-BLD” indication when displayed next to the N2 indication?
Cross bleed air is recommended for in-flight start
When is ignition selected for all engines?
-Trailing edge flaps are out of up
-Continuous ignition switch is ON
How many igniters are selected for ground start, and how many for in-flight start?
One igniter for ground start
Two for in-flight start
What are the PW engine warm up requirements for oil temperature before takeoff?
Above the lower amber band
GENX2B67 engine EEC’s command ice crystal anti icing when ice crystal icing conditions are detected at altitudes higher than ______?
30,000’
GENX2B67 engine ice crystal anti icing cycle continues for __________ minutes as long as ICI conditions are detected or the airplane descends below _________.
15 minutes
28,000’
When does the GENX2B67 engine select minimum or approach idle/
-Eng Anti Ice ON
-Landing Gear down
- Flaps 20
- Flaps in Landing position
- Thrust Reverser operation
Under what condition on the ground will the GEnx EEC shut down an engine to provide protection against thrust asymmetry due to a control malfunction?
Thrust lever 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
-Engine shut down between 30-360 minutes
-EGT greater than 30C
During engine start the GEnx engine EEC will attempt corrective action for the following conditions: (4)
-hot start
-hung start
-no EGT rise
-compressor stall
GEnx engine inflight start attempt will increase EGT limit by 25C after 4 start attempts adn will repeat this action on subsequent reattempts until?
Start is achieved or EGT limit is reached
