Engines Flashcards
In the normal mode, what does the EEC use as the controlling parameter for the GE engines? For PW engines?
N1-GE
EPR-PW
What protection features are provided in the EEC normal mode?
1) Thrust limiting
2) Maintains constant thrust
3) Over-speed protection
What occurs with 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?
1.Nacelle anti-ice on
2.Flaps in a landing position
3.Continuous ignition switch is ON
4.During thrust reverser operation
What action should be taken prior to manual selection of EEC alternate mode?
Decrease thrust lever position;
Note: thrust does not change when EEC auto transfers control from normal mode to alternate mode
What happens when you turn the continuous CON ignition switch on?
Selected igniters operate continuously
Command approach idle minimum
What two engine indications are displayed full time on the Primary EICAS on a GE?
N1 & EGT
What color does the EGT change to if the EGT start or takeoff limit is reached?
Red
If the airborne vibration monitoring system cannot determine the source of the vibration, (FAN,LPT,NT) it will display BB, what does this mean?
Broadband - the average vibration detected
What 3 items will the autostart system protect the engine from during an engine start that also result in an ENG 1,2,3,4 AUTOSTART EICAS message?
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?
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?
-Trailing edge flaps out of up position
-Continuous ignition switch ON
How many igniters are selected for ground start, and how many for in flight start?
One for ground
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 ___ ft?
30,000’
GENX2B67 engine ice crystal anti icing cycle continues for __ minutes as long as ICI conditions are detected or airplane descends below __ feet?
15 minutes
28,000’
When does GEN2B67 engine select minimum or approach idle?
1.Engine Anti-ice on
2.Landing Gear down
3.Flaps 20 selected
4.Flap in landing position
5.Thrust reverser operation
“FFELT”
Under what condition on ground will the GEnx EEC shutdown 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 shutdown between 30-360 minutes
EGT is greater than 30C
During engine start the GEnx engine EEC will attempt corrective action for what conditions?
Hot start
Hung start
no EGT rise
compressor stall
GEnx engine inflight start attempt will increase EGT limit by 25C after 4 start attempts and will repeat this action on subsequent reattempts until?
Start is achieved or EGT limit is reached
