7: Engines, APU

Question 1

EEC Structural Limit Protection?
(Not Abnormal Start Protection on ground)

Answer 1

N1 and N2 redline overspeed protection in both normal and alternate modes.
No EGT redline exceedence protection

Question 2

TCMA- what does it stand for?

Answer 2

Thrust Control Malfunction Accommodation

Question 3

TCMA- the EEC commands shutdown of the affected engine when?

Answer 3

• airplane is on the ground
• thrust lever is at idle
• engine is above idle speed and not decelerating normally

Question 4

EOS- what does it stand for?

Answer 4

Electronic overspeed system

Question 5

EOS- when does it operate?

Answer 5

An uncontrollable N2 overspeed is detected
In flight

The EEC automatically shuts off fuel to the affected engine

Question 6

EEC Idle. Which do you get?

Answer 6

Ground minimum idle
Flight minimum idle
Icing idle
Approach idle

Question 7

EEC Idle- Icing idle, when?

Answer 7

In flight, clean and engine anti-ice on

Goes from min flight idle at 30400 to full icing idle at 22000

Question 8

EEC Idle- Approach idle when?

Answer 8

Flaps 15 or greater or any time flaps extended and engine anti-ice on
(on the MAX)

Question 9

Normal Starter Duty, how long can a start attempt be and how long is needed between starts? (MAX and NG)

Answer 9

Max:Each start attempt is limited to 3 min
NG: Each start attempt is limited to 2 min
10s needed between start attempts

Question 10

Do the ABORTED ENGINE START for one or more of the following:

Answer 10

• N1 or N2 does not increase or increases very slowly after the EGT increases
• there is no oil pressure indication by the time that the engine is stable at idle
• the EGT does not increase by 15 seconds after engine start lever is moved to idle
• the EGT quickly nears or exceeds the start limit

Question 11

Abnormal Start Protection (Ground starts only)

Answer 11

• Impending hot starts
• engine stalls
• EGT start limit exceedance
• wet start

Question 12

EEC, Inflight starting. Diff between max and ng

Answer 12

On the Max the EEC would interrupt fuel flow when EGT is within 10 deg of the start limit redline for about 1 second.

This is not on the NG and on the NG you can have one or 2 EGT redlines

Question 13

Engine fuel system diff max and ng

Answer 13

The NG has a HMU (hydro mechanical unit) and the MAX has an FMU (fuel metering unit)

Question 14

MAX Engine warm up requirement

Answer 14

Before setting takeoff thrust. verify that the engine oil temp is at or above 31 deg Celsius.

Question 15

MAX Engine warm up recommendation

Answer 15

Run the engines for at least 3 minutes

Question 16

NG Engine warm up requirement

Answer 16

Verify an increase in engine oil temp before takeoff

Question 17

NG Engine warm up recommendation

Answer 17

Run the engines for at least 2 minutes

Question 18

Prelim Pre-Flight; amount of engine oil that you should see?

Answer 18

At least 60% plus 2% per hour per engine

Question 19

Definition of maximum motoring?

Answer 19

When N2 acceleration is less than 1% in approximately 5 seconds

(Remember that you need min 20% N2)