Engines, APU Flashcards

1
Q

(ALL) Identify the conditions that would lead to an aborted engine start
and accomplishment of the Aborted Engine Start checklist.

A

 Oil pressure rise does not occur.
 Fuel flow is abnormally high or fluctuating.
 EGT does not increase by 20 seconds after the FUEL CONTROL switch is positioned to RUN.
 N1 fails to increase after EGT rise
 EGT quickly nears or exceeds the start limit.
 Oil pressure indication is not normal by the time the engine is stabilized at idle

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2
Q

(ALL) Recall the required engine warm up period prior to the application
of T/O thrust.

A

 Required warm up time is 3 minutes.
 Target warm up time is 5 minutes.

Note: Do not delay takeoff after 3 minute warm-up period.

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3
Q

3 (ALL) Recall the engine cool down recommendations prior to engine shutdown.

A

 Run the engine for at least 3 minutes.

 Shutdown may be accomplished earlier for gate arrival

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4
Q

(756) Describe when the FUEL CONTROL switch should be placed

to RUN during an engine start.

A

 Verify oil pressure increase and N2 rotation
 When N2 is at 25%, or if 25% N2 is not possible at maximum motoring speed, attempt the start at a minimum of 18% N2 (757)
or 15% N2 (767).

NOTE: A magenta bug (fuel on command bug) appears at:
18% N2 on the 757
15% N2 on th e767

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5
Q

(756) Recall the APU starter duty cycle.

A

The starter duty cycle is a maximum of 3 consecutive starts or attempts within a 60 minute period.

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6
Q

(756) Recall the maximum altitude to use APU Electrics.

A

Electrical power is available throughout the entire airplane operating envelope

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7
Q

(756) Recall the maximum altitude to use APU Pneumatics.

A

In flight, APU bleed air is available up to approximately 17,000
feet

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8
Q

What protections do the EEC’s provide

A
  • Overboost
  • N1 and N2 overspeed protection

Note: No EGT over temperature protection provided

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9
Q

(756) Recall the primary indication for setting thrust on PW engines.

A

EPR

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10
Q

Recall the primary indication for setting thrust on GE engines.

A

N1

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11
Q

(756) Explain how to cancel the APU shutdown sequence if OFF is selected and the RUN light is still illuminated.

A

Momentarily move the APU selector to the START position.

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12
Q

(756) Recall the meaning of an illuminated APU RUN light.

A

The APU is at operating speed

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13
Q

(756) Recall the meaning of an illuminated APU FAULT light.

A

 Illuminated (amber):

  • The APU has automatically shut down.
  • The APU fuel valve disagrees with the commanded position.
  • A fault is sensed.

Note: The FAULT light momentarily illuminates during an APU start
because the APU fuel valve initially disagrees with the commanded position.

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14
Q

(756) Recall the engine starter duty cycle.

A

 Continuous for 5 minutes

 Cool for 30 seconds per minute of operation

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15
Q

(756) Recall the meaning of an illuminated L or R ENG OIL PRESS light.

A

The respective oil pressure is at or below the minimum value.
 The oil pressure switch has malfunctioned.

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16
Q

(756) Recall the oil quantity requirements.

A

 17 quarts recommended for start.
 If oil quantity is less than 17 quarts, verify 8 quarts following engine warm-up with engine at idle.
 If oil quantity is less than 8 quarts following engine warm-up, Dispatcher Approval is required.

17
Q

(756) Understand the controls and indicators on the Thrust Mode Select
Panel (TMSP).

A

 Pushing a switch on the TMSP manually selects a desired thrust reference mode.
 Verification of the selected mode being active is displayed above
the primary thrust reference (N1 or EPR as appropriate).
 Rotating the TEMP SEL knob is a means of selecting an assumed temperature in lieu of using the FMS to enter an assumed temperature.
 If an assumed temperature has been entered and normal thrust
(takeoff power) is desired, selecting TO/GA on the TMSP will eliminate the assumed temperature and select normal thrust
(takeoff power).

18
Q

(756) Recall the meaning of a TAI indication on the upper EICAS display.

A

 Displayed (green) - engine anti–ice is on

 Displayed (amber) - engine anti–ice is on, but N1 is too low

19
Q

(756) Know where the EICAS TAT is displayed.

A

 Upper EICAS

Note: On the ground, TAT approximates Outside Air Temperature

20
Q

(756) Understand how engine exceedances are displayed on the EICAS

A

 The current exceedance is displayed in red

 The max exceedance attained is displayed by a white number below the boxed number.

21
Q

(756) Recall the function of the ENG START selectors.

A

 GND (push-in and rotate) –
- Opens the start valve to supply starter air.
- Arms the selected igniter(s).
- The selector is magnetically held in the GND position until 50% N2 RPM.
 AUTO –
- The selector releases to AUTO at 50% N2 RPM.
- Closes the start valve and terminates ignition.
- The selected igniter(s) operate continuously with the L.E. slats extended or engine anti-ice on.
 OFF –
- No ignition.
 CONT –
- The selected igniter(s) operate continuously.
- There is no operating time limit.
 FLT –
- Both igniters operate continuously regardless of the ignition
selector position
- There is no operating time limit.

22
Q

(756) Recall the function of the L/R FUEL CONTROL switches.

A
 RUN –
- The normal position for engine operation
- Opens the engine and spar fuel valves
- Activates the selected igniter(s).
 CUT OFF –
- Closes the engine and spar fuel valves
- Terminates ignition.
23
Q

(756) Recall the indications for the Thrust Reverser System

A

 REV (amber)
- When the reverser is unlocked or in transit.
 REV (green)
- The reverser is fully deployed