Oral Bank - ENGINES

Question 1

In the normal mode, what does the EEC use as the controlling parameter for the GE engines? PW engines? (2)

Answer 1

• N1 for GE
• EPR for PW

Question 2

What protection features are provided in the EEC Normal mode? (3)

Answer 2

Thrust limiting
Maintains constant thrust
Over-speed protection

Question 3

What occurs with the auto-throttle system when any EEC control is switched to alternate mode?

Answer 3

The A/T’s disconnect, but can be reconnected when all EEC’s have been switched to alternate mode

Question 4

What EEC normal mode protection feature is not available in EEC alternate mode?

Answer 4

Thrust limiting at MAX N1

Question 5

When does the EEC select approach idle? (4)

Answer 5

• Nacelle anti-ice is ON
• Flaps in a landing position
• Continuous ignition switch ON
• During thrust reverse operation

Question 6

What action should be taken prior to manual selection of the EEC alternate mode?

Answer 6

Decrease thrust lever position

Question 7

What happens when you turn the continuous (CON) IGNITION switch on? (2)

Answer 7

• Selects igniters to operate continuously
• Commands approach idle minimum

Question 8

What two engine indications are displayed full time on the Primary EICAS on a GE?

Answer 8

• N1
• EGT

Question 9

What colour does the EGT change to if the EGT start or T/O limit is reached?

Answer 9

Red

Question 10

If the airborne vibration monitoring system cannot be determine the source of the vibration it will display ‘BB’. What does this mean?

Answer 10

Broadband (broadband vibration is the average vibration detected)

Question 11

What 3 items will the autostart system protect the engine from during engine start?

Answer 11

• Hot start
• Hung start
• No EGT rise

Question 12

How is the engine thrust reverser actuated on the GE engine?

Answer 12

Pneumatically actuated fan air

Question 13

How is the engine thrust reverser actuated on the PW engine?

Answer 13

Powered by hydraulic pressure from the related hydraulic system to actuate the fan air thrust reversers

Question 14

How is the engine thrust reverser actuated on the GEnx B747-8 engine?

Answer 14

Hydraulically actuated fan air

Question 15

With an engine shut down, what does “X-BLD” indicate when displayed next to the N2 indication?

Answer 15

Crossbleed air is recommended for in-flight start

Question 16

When is ignition selected for all engines? (2)

Answer 16

• Trailing edge flaps are out of the up position
• Continuous ignition ON

Question 17

How many ignitors are selected for ground start and how many for in-flight start?

Answer 17

• One for ground start
• Two for in-flight

Question 18

What are the PW engine warm up requirements for oil temp before takeoff?

Answer 18

Above the lower amber band

Question 19

GENX2B67 engine EEC’s command ice crystal anti-ice when ice crystal icing conditions are detected at altitudes higher than?

Answer 19

30,000ft

Question 20

GENX2B67 engine ice crystal anti-icing cycle continues for ____ minutes as long as ICI conditions are detected or airplane depends below __________ ft?

Answer 20

• 15 minutes
• 28,000ft

Question 21

When does GENX2B67 engine select minimum or approach idle? (5)

Answer 21

• Engine anti-ice ON
• Landing gear DOWN
• Flaps 20 selected
• Flap in landing position
• Thrust reverser operation

Question 22

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)

Answer 22

• Thrust leaver at/near idle, AND
• Engine above command N1 speed and not decelerating normally

Question 23

During engine start when will the GEnx engine provide additional 40 seconds of motoring time at 20% N2? (2)

Answer 23

• Engine shutdown between 30-360 minutes
• EGT greater than 30 degrees C

Question 24

During engine start the GEnx engine will attempt corrective action for which conditions? (4)

Answer 24

• Hot start
• Hung start
• No EGT rise
• Compressor stall

Question 25

GEnx engine inflight start attempt will increase EGT limit by 25 degrees C after 4 start attempts and will repeat this action on subsequent reattempts until?

Answer 25

Start is achieved or EGT limit is reached