Chapter 7 - Engines & APU

Question 1

How long are MAX CONT EGT limits inhibited ?

Answer 1

For 5min during T/O or G/A.

Question 2

When is the SEI (standby engine indicator) automatically activated in-flight ?

Answer 2

• AC power lost

- EICAS failed

Question 3

What is the start-valve cut-out N2 value ?

Answer 3

50% N2.

Question 4

With selectors in AUTO, when is ignition activated ?

Answer 4

• LE slats extended

- EAI on

Question 5

When does the APU fault light illuminate ?

Answer 5

• APU fault (resulting in shutdown)

- APU fuel valve disagreement

Question 6

When performing a max thrust T/O, will the commanded thrust be 100% of the max thrust ?

Answer 6

No, it will be 1-2% lower until 65kts and increase then.

Question 7

Does the A/T respond to manual set reference N1 values ?

Answer 7

No.

Question 8

If the ambient temperature is higher than the selected assumed temperature, is D-TO indicated ?

Answer 8

No.

Question 9

Until which altitude is reduced climb possible ?

Answer 9

12,000ft. The 1 or 2 indication disappears at 12,500ft.

Question 10

Which has priority: APU bleed air or electrical power ?

Answer 10

Electrical power.

Question 11

Until which altitude is APU bleed air available ?

Answer 11

17,000ft.

Question 12

What energizes the APU start ?

Answer 12

The APU battery and the main battery.

Question 13

If the APU selector is accidently moved to OFF, can the shutdown process be cancelled ?

Answer 13

Yes, if RUN is still illuminated and the switch is moved momentarily to START.

Question 14

Will the APU shut down if in-flight the battery switch is moved OFF ?

Answer 14

No.

Question 15

Will the APU go through a cooldown cycle if the battery switch is moved to OFF ?

Answer 15

Yes, but fire protection is not available.

Question 16

Does the APU FAULT light illuminate momentarily during APU start or shutdown ?

Answer 16

Yes ! (Because the light also indicates a disagreement of the APU fuel valve).

Question 17

Can the APU FAULT light be illuminated when the APU selector is moved to OFF ?

Answer 17

Yes, but only in the case of an APU fuel valve disagreement. Other faults are inhibited !

Question 18

What is the meaning of the maximum N1 indication ?

Answer 18

The maximum rated thrust (for all thrust settings) in the current ambient conditions. This is equal to full forward thrust lever position.

Question 19

Is the A/T available when the EEC goes in alternate mode for either engine ?

Answer 19

No.

Question 20

What is the meaning of the L/R ENG LIM PROT message when the EEC is in alternate mode ?

Answer 20

Engine is in the overboost range.

Question 21

Is thrust increased when the EEC go into alternate mode ?

Answer 21

Yes, but only after the thrust levers have been moved to idle.

Question 22

Does the EEC provide EGT over-temperature protection ?

Answer 22

No.

Question 23

How can approach idle be manually selected ?

Answer 23

By moving the start selectors to CONT.

Question 24

What is the normal N2 value to position the fuel control switch to RUN ?

Answer 24

20% N2.

Question 25

How is the minimum N2 value indicated during a ground or a xbleed in-flight start ?

Answer 25

By the magenta fuel on-command bug.

Question 26

What are the normal starter duty limitations ?

Answer 26

• 5min max

- 1,5min OFF per minute ON.

Question 27

What are the starter re-engagement limitations ?

Answer 27

• 0% recommended
• 0%-20% normal
• 20%-30% emergency (fire)
• > 30% may result in damage

Question 28

When is the engine inflight start information displayed ?

Answer 28

• Engine was shutdown, AND

- both EICAS primary and secondary displays selected

Question 29

How are the igniters powered ?

Answer 29

MAIN AC, with AC STANDBY BUS as backup

Question 30

Where is FF measured ?

Answer 30

After the engine fuel shutoff valve.

Question 31

How many fuel pumps increase the fuel pressure between the spar and the engine fuel shutoff valve ?

Answer 31

Two, the first stage and the second stage.

Question 32

How is the fuel heated before entering the engine ?

Answer 32

By an fuel/oil heat exchanger.

Question 33

Where is oil pressure measured ?

Answer 33

After the oil pump and oil filter.

Question 34

Where is oil temperature measured ?

Answer 34

After the scavenge pump.

Question 35

Are there any procedures for an engine low oil quantity ?

Answer 35

No.

Question 36

What is BB vibration ?

Answer 36

Broadband vibration. Average vibration level is the source cannot be determined.

Question 37

In general, how can engine vibrations be reduced ?

Answer 37

By descending and reducing speed.