Engines And APU

Question 1

When are secondary engine indications displayed?

Answer 1

Displays initially receive PWR
In FLT when eng start lever is moved to cutoff

In FLT when N2 RPM is Below idle

A secondary eng parameter is exceeded

Question 2

Till when are secondary eng indications displayed

Answer 2

Till condition is no longer present

Question 3

What happens to indications when EEC is not powered?

Answer 3

It comes directly from the eng sensors

Question 4

When does EEC receive PWR

Answer 4

When ENG start switch is moved to GRD and N2 greater than 15%

Question 5

When does EEC alternatief between channels?

Answer 5

With each eng start attempt and when operating channel fails

Question 6

What is used by EEC to set thrust?

Answer 6

N1

Question 7

What happens with loss of either DEU?

Answer 7

EEC’s revert to ALTN mode to prevent engines operating on a Single source of data

Question 8

What is the threat in hard ALTN mode?

Answer 8

Thrust protection not provided and max rated thrust reached at TL less than Full forward

Question 9

When does filter bypass light illuminate?

Answer 9

In case of impending bypass of filter

Question 10

Where is FF measured

Answer 10

After Engine fuel shutoff valve

Question 11

What does GRD do?

Answer 11

It uses BAT PWR to close ENG bleed air valve and open the start valve.

On GND arms selected igniter
In FLT arms both igniters

Question 12

Why can EGT rise earlier than FF?

Answer 12

Because FF indications lag by 2 secs

Question 13

For what kind of abmormal starts do the EEC’s provide protection?

Answer 13

Hot start, eng stall, wet start and EGT start limit exceedance

Question 14

From which buses do Left and right igniters receive Power respectively

Answer 14

Left: AC TRX BUS 1
Right: AC STBY BUS

Question 15

When does auto-relight occur?

Answer 15

In case of uncommanded Rapid decrease in N2 or N2 is below idle RPM

Question 16

What happens to reverser light on aft OVHD panel?

Answer 16

After reverser is Commanded to stow, It illuminates untill isolation valve closes. (Takes normally 10 seconds) If It is illuminated for 12 secs master caution light illuminates

Question 17

What happens in case of incomplete stowage of thrust rev?

Answer 17

Auto-restow circuit stows reversers

Question 18

What elec PWR does the APU need to start?

Answer 18

AC TRX BUS 1 or main BAT

Question 19

What is normal EGT for APU start

Answer 19

1100 degrees

Question 20

When does APU shutdown occur?

Answer 20

60 sec’s After APU switch off

Question 21

What is amber N1?

Answer 21

N1 value for full rated thrust

Question 22

What does amber rev light indicate

Answer 22

Reverser moved from stowed Pos

Question 23

When is oil filter Bypass alert blinking inhibited?

Answer 23

80 knots to 400ft RA
200FT RA to 30 sec’s After ldg

Question 24

What is meant by amber on secondary eng indications?

Answer 24

Caution range

Question 25

When is low oil press amber band shown?

Answer 25

Above 65% N2

Question 26

In what unit is oil quant shown

Answer 26

Quarts

Question 27

What does engine control light indicate and when is It working?

Answer 27

Engine control sys not dispatchable

Eng operating and
A/c on GND with less than 80kts on t/o and 30secs after touchdown

Question 28

When is ENG run up required?

Answer 28

OAT 3 degrees or below and ENG anti-ice required

Question 29

What does start valve open light indicate

Answer 29

Start valve is open and air is being supplied to starter

If it is blinking, there is a uncommanded opening of start valve

Question 30

What does reverser light on ovhd indicate

Answer 30

Isolation valve or thrust reverser control valve not in commanded position

One or more thrust rev sleeves not in commanded state

Auto restow circuit activated

Failure detected in synch shaft lock circuitry

Question 31

When does a/c set APP idle

Answer 31

Cowl anti ice on for either engine

ALT below 19000ft and left or right main gear down and locked

ALT below 19000ft and left or right flaps 15

If no flap or gear Signals -> 19000ft