B-747 Oral Question Bank & Review Engines

Question 1

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

Answer 1

N1
EPR

Question 2

What protection features are provided in the EEC Normal mode?

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 auto-throttles disconnect, but can be reconnected when all EECs 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 maximum N1 (maximum thrust can be achieved prior to thrust lever position at full
forward)

Question 5

When does the EEC select approach idle?

Answer 5

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

Question 6

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

Answer 6

• Decrease thrust lever position.
  Note: Thrust does not change when the EEC auto transfers control from normal mode to alternate mode.
  FCOM, VOL 2; 7.20.4 & QRH 7.12

Question 7

What happens when you turn the Continuous (CON) IGNITION Switch ON?

Answer 7

• Selected igniters 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 color does the EGT change to if the EGT start or takeoff limit is reached?

Answer 9

Red
FCOM,VOL 2; 7.10.8

Question 10

If the airborne vibration monitoring system cannot determine the source of the vibration (FAN,LPT,NT) it will display “BB”. What does this mean?

Answer 10

• Broadband
  Ø Broadband vibration is the average vibration detected

Question 11

What 3 items will the autostart system protect the engine from during and engine start that also will result in an ENG 1, 2, 3, 4 AUTOSTART EICAS message ?

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?

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?

Answer 16

1. Trailing edge flaps are out of the up position
   2.Continuous ignition switch is ON

Question 17

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

Answer 17

• One igniter for ground start
• Two for in-flight start

Question 18

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

Answer 18

• above the lower amber band

Question 19

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

Answer 19

• 30,000 feet