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787 Technical Questions > 07 Engines, APU > Flashcards

07 Engines, APU Flashcards

1
Q

Which engine parameters are permanently displayed on the EICAS?

A

TPR, N1, EGT

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2
Q

a. Where is the reverser position indication displayed?
b. What does amber REV indicate?
c. What does green REV indicate?

A

a. Above the TPR Indications
b. Reverser in transit
c. Reverser fully deployed

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3
Q

What does the TPR instrument amber line represent?

A

Maximum TPR

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4
Q

What does the red line on the N1 instrument represent?

A

N1 RPM operating limit

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5
Q

When does the EGT Start Limit Line appear on the EGT indications?

A

• Engine fire switch is in
+ FUEL CONTROL switch CUTOFF
or
• N2 RPM below idle

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6
Q

Which parameters are displayed on the secondary engine indications?

A 
N2 RPM
N3 RPM
fuel flow (FF)
Oil pressure
Oil temperature
Oil quantity
Vibration.
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7
Q

During engine start, when does the green RUNNING indication above the N2 gauge disappear?

A

30 seconds after the engine reaches idle.

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8
Q

What causes the automatic display of the secondary engine indications?

A
  • When the displays initially receive electrical power
  • FUEL CONTROL switch is moved to CUTOFF in flight
  • An engine fire switch is pulled in flight
  • A secondary engine parameter is exceeded
  • Engine N2 RPM is below idle in flight
  • A start selector is in the START position
  • FUEL FLOW ENG L/R Advisory is shown
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9
Q

What colour are the normal operating ranges displayed on either an engine dial or vertical indication?

A

White

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10
Q

What colour do the oil temperature and pressure indications turn to when the caution range is reached?

A

Amber

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11
Q

a. What indications are given if an N1, N2, EGT, oil temperature or oil pressure operating limit is exceeded?
b. When are these indications removed?
c. What remains on the N1, N2, (N3) and EGT displays?

A

a. The digital readout, dial, box, and pointer change colour to red for that indication.
b. When it returns to the normal operating range.
c. The box enclosing the digital readout remains red.

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12
Q

Does the TPR indication change colour if the maximum TPR is reached?

A

No.

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13
Q

a. When are the EGT indications inhibited from changing to amber?
b. Is the red maximum takeoff limit also inhibited?

A

a. For 5 minutes during takeoff or go-around (10 minutes for single- engine operation).
b. No.

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14
Q

a. When the EEC is in Normal mode, which parameter is used to control engine thrust?
b. Which parameter is used if the EEC is in Alternate mode?

A

a. TPR

b. N1

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15
Q

If the EEC reverts to the Soft Alternate mode, does the autothrottle disengage?

A

No.

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16
Q

If EEC Hard Alternate mode is selected by the crew: -

a. What is then displayed on the N1 indication?
b. Could engine thrust increase?
c. What protection is no longer available?

A

a. Reference and target N1, and maximum and commanded N1 values are displayed
b. The alternate mode schedule (N1 schedule) provides equal or greater thrust than the normal mode for the same thrust lever position.
c. Thrust protection is not provided in the alternate mode and maximum rated thrust is reached at a thrust lever position less than full forward.

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17
Q

What other protections do the EECs provide?

A

N1 and N2 overspeed protection

N3 is indirectly protected by the N1 and N2 protection

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18
Q

a. If overspeed protection fails, what do the EECs command the engine to do?
b. What EICAS caution message displays in this situation?

A

a. The EEC commands fuel shut off to shutdown the engine.

b. ENG FAIL (L or R).

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19
Q

a. What protection does Thrust Control Malfunction Accommodation provide?
b. When would the EEC shutdown the affected engine?

A

a. Protection against idle thrust asymmetry conditions while on the ground.
b. • Airplane is on the ground, and
• Thrust lever is at idle, and
• Engine is above idle speed and not decelerating normally

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20
Q

What protection does Thrust Asymmetry Protection (TAP) provide?

A

Protection against asymmetric thrust during takeoff or go-around by limiting thrust on the higher thrust engine.

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21
Q

Is climb performance still maintained when TAP is in effect?

A

Yes.

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22
Q

Is TAP available in both EEC modes?

A

Yes.

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23
Q

In flight, when do the EECs set: -

a. Approach idle?
b. Icing idle?

A

a. • The flaps are commanded to 25 or greater, or
• the landing gear is selected DOWN.
b. Engine anti-ice on.

24
Q

Can the engines be started manually?

A

No.

25
Q

What actions will open the spar fuel valve?

A

Moving the Start selector to START or the Fuel Control switch to RUN.

26
Q

When is simultaneous engine start allowed?

A

When the APU is running and both APU starter generators are operational.

27
Q

On the ground, how many start attempts will the Autostart system make for each start sequence?

A

Two.

28
Q

For what conditions will Autostart not make a second attempt?

A
  • Loss of both starters.

* No N1 rotation.

29
Q

a. How many autostart attempts are made for an inflight start?
b. When would these attempts end?

A

a. Autostart makes continuous start attempts.
b. Until the engine either starts or the pilot aborts the start attempt by positioning the FUEL CONTROL switch to CUTOFF (and positioning the START switch to NORM if it was a starter assisted attempt).

30
Q

a. Where is the inflight start envelope shown if an engine is not running in flight?
b. What further display is provided if the airspeed is below that required for a windmilling start?

A

a. EICAS display.

b. X-START is displayed below the N2 indication.

31
Q

How many ignitors are used during an in-flight start?

A

Two.

32
Q

When does the auto-relight function activate?

A

• Flameout is detected
or
• An engine is at or below idle with the Fuel Control switch in RUN.

33
Q

Is there a minimum oil quantity limit?

A

There are no operating limitations for the engine oil quantity.

34
Q

What are the indications of low engine oil quantity?

A

Automatic display of the secondary engine display and reverses the display indication to show black numbers on a white background.

35
Q

How are the thrust reversers actuated?

A

Hydraulically.

36
Q

Can the thrust reversers be selected in flight?

A

No.

37
Q

Can reverse thrust be selected if the thrust lever is away from idle?

A

No.

38
Q

What do the following EICAS alerts indicate:

a. ENG REV LIMITED (L or R)
b. ENG REVERSER (LorR)
c. ENG REV AIR/GND
d. ENG REV COMMANDED (LorR)

A

a. The reverser cannot deploy when commanded, or can deploy only with reverse thrust limited to idle.
b. Reverser system fault.
c. . The air/ground logic that prevents in-flight thrust reverser deployment has failed.
d. A reverse thrust lever is not in the down position in flight

39
Q

Where is the vibration indication displayed?

A

The secondary engine display.

40
Q

What does the display indicate?

A

The highest vibration level from the N1, N2, N3 rotors or BB (broadband)

41
Q

What are the indications for high engine vibration?

A

The secondary engine parameters are automatically displayed and the digital vibration readout is displayed in reverse (black digits on white background).

42
Q

a. What alert is displayed on the HUD and PFD if actual thrust is less than commanded thrust during take-off?
b. What other indications are there?
c. What is the airspeed range that this alert is active?

A

a. ENG FAIL (red on the PFD, green on the HUD)
b. Voice annunciation “Engine Fail,” and the Master WARNING lights illuminate.
c. Between 65 knots and 6 knots prior to V1.

43
Q

What conditions would trigger the EICAS caution alert ENG THRUST?

A
  • The engine is producing less/more than commanded thrust, and actual thrust is not satisfactorily increasing/decreasing towards the commanded thrust,
  • and, the current airspeed is greater than 6knots prior to V1
44
Q

What is the maximum altitude the APU can be started and operated?

A

Airplane maximum certified altitude.

45
Q

What does the APU supply?

A

Electrical power.

46
Q

During APU start: -

a. What does the Main battery power?
b. What does the APU battery power?

A

a. APU fuel spar valve, DC fuel pump, fire detection system.

b. APU controller, air inlet door and right starter if required.

47
Q

With no AC power available, what is the source for the APU fuel?

A

DC fuel pump in the left main tank.

48
Q

Once AC power is available, which pump supplies fuel to the APU?

A

Left aft fuel pump.

49
Q

a. Can the APU be started with no fuel pumps operating? b. If so, when?

A

a. Yes.

b. On the ground or in-flight up to 14,000ft.

50
Q

What indication is given when the APU is running?

A

EICAS memo message APU RUNNING.

51
Q

If the APU fails to start: -

a. What happens to the APU?
b. What indication is given?

A

a. The APU shuts down automatically.

b. EICAS advisory message APU SHUTDOWN displays.

52
Q

a. How many consecutive start attempts can the APU battery make?
b. How long is the cooling period before another start attempt can be made?

A

a. Two.

b. Five minutes.

53
Q

When would the APU start automatically?

A

In flight, if three or more engine generators go offline.

54
Q

When is the APU in attended mode?

A

When either engine is starting or running, or when the airplane is in flight.

55
Q

What indication is given when the APU is in attended mode and it continues to run after a fault has occurred?

A

EICAS caution message APU LIMIT displays.

787 Technical Questions (20 decks)

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