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Engines&apu Flashcards

1
Q

What elec pwr source is reqd for starting the apu

A

Aircraft battery

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2
Q

7,8,9 apu gen will supply both transfer buses in flight

A

True

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3
Q

What is the fuel source for starting the apu with inly battery power avail

A

1fuel tank

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4
Q

-800 inflight with apu running. Turning off aircraft battery switch will

A

Cause the apu to shut down

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5
Q

What are initial indications when apu is starting

A

LOW OIL PRESSURE light on, full scale negative amps indication on DC ammeter BAT position

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6
Q

New gen 737 apu gen can be used to supply both Transfer Buses up to what max altitude

A

41000 ft if no APU bleed air is used

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7
Q

What does an illuminated APU MAINT light indicate

A

Oil quantity is insufficient for extended operation

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8
Q

What prevents the APU electricsl and bleed air loads from increasing the EGT above acceptable levels

A

The APU bleed valve modulates toward the closed position

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9
Q

What indicates the APU gen is ready for use

A

When the blue APU GEN OFF BUS light illuminates

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10
Q

What is the normal procedure for using APU bleed air after starting the APU

A

APU bleed air switch may be turned ON after one full minute of APU operation

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11
Q

What causes an automatic shutdown of the APU

A

Fire warning

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12
Q

What causes an automatic shutdown of the APU inflight (700)

A

BAT sw placed to OFF

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13
Q

Which of the following causes an automatic shutdown of the ASpU in flight or on the ground

A

Fire warning

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14
Q

Which sequence of events should be accomplished for normal shutdown of the APU when securing the airplane

A

Operate for one minute with no pneumatic load, place APU switch to OFF , wait 20 seconds, then battery switch to OFZf

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15
Q

Which of the owing set of conditions causes the APU OVERSPEED light to illuminate

A

All of the answers are correct

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16
Q

A norm APU start cycle can take as long as(500)

A

135 secs

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17
Q

Inflight, with one engine generator inoperative, the APU can supply electrical power to:(500)

A

One bus up to 35000 ft

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18
Q

700 aircraft is parked with APU running . Turning the APU control switch to OFF

A

All answers are correct

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19
Q

An illuminated APU GEN OFF BUS light indicates

A

The APU is at operating speed

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20
Q

Turning the battery switch to OFF inflight, will cause the APU to shut down(500)

A

False

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21
Q

Minimum battery voltage for APU start is

A

23 volts

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22
Q

APU starter engagement may first be observed by(500)

A

Full scale left deflection of DC ammeter with the BAT position selected

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23
Q

After APU shutdown, the battery switch should remain on for 20 seconds after the APU switch has been placed to OFF

A

True

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24
Q

What causes an APU OVERSPEED annunciator light to illuminate

A

All of these answers are correct

25
An illuminated APU DET INOP light when no fire warning test is being performed
Requires the APU to be shut down, if operating because the detector is inop
26
After an inflight APU start, the APU will supply____
Pneumatic load only up to 17000 ft
27
The max allowable EGT for the APU is
760 degrees C maximum, 710 degrees C max continuous
28
After aborting an ASpU start , how soon may another start be atttempted
After 4 minutes
29
Successful APU starts are not assured above
Fl250
30
What is the primary function of the Main Engine Control
Hydromechanical control of the fuel
31
What is the automatic function of the PMC during a climb
Maintain initial n1 climb thrust throughout climb
32
When is Engine speed commanded to LOW IDLE
On the ground, four seconds after touchdown
33
How is the main fuel shutoff valve at the engine spar operated
Electrical control by the engine start lever and fire switch
34
A dim FUEL VALVE CLOSED light indicates
Engine fuel control shutoff valve(MEC valve) is closed
35
What does an illuminated furl FILTER BYPASS light indicate
Impending bypass of the engine fuel filter
36
How is the Main Engine Control (MEC) fuel shutoff valve operated? (This valve is at the engine fuel control)(500)
Mechanically by the engine start lever
37
What does the engine oil pressure indicator show
Unregulated pressure as a function of N2 speed
38
What is indicated when the OIL FILTER BYPASS light illuminates
The scavenge oil filter is contaminated
39
The engine oil temperature indicator shows oil temp coming out of the engine prior to the oil cooler
True
40
During engine start, the start switch disengages at ____N2
46%
41
The _____shows the current mode of the N1 limit computed by the FMC
Thrust Mode Annunciator
42
The engine accessory components are driven by
The N2 spool
43
With the engine at normal operating temp and idle, the oil PRESSURE must be
Above the red radial
44
Engine fan air cools
The CSD/Generator
45
With the engine at climb N1 limit power , the ____ stage pneumatic bleed provides bleed air for the pneumatic system
5th
46
The power to move the engine thrust reversers is
Hydraulic
47
Engine oil is cooled by
Engine fuel flow
48
Reverse thrust operation is permitted for
Ground use only
49
Max eng N1 limit | 500
106%
50
Max eng N2 | 500
105%
51
Max takeoff EGT | 500
930 C
52
Max continuous EGT | 500
895C
53
Max starting EGT
725 C
54
Min oil pressure for continued engine operation
13 psi
55
An engine must be shut down if oil temp exceeds | 500
165C
56
Which is the correct PMC switch configuration for takeoff
Both must be ON or both INOP(OFF)
57
New Gen aircraft APU gen willpower both Transfer Busses inflight
True
58
700 aircraft is parked at gate with APU running. Turning APU control seitch to OFF
Causes shutdown after 1minute
59
New Gen 737 APU gen can be used to supply both Transfer Buses up to what max altitude
41000ft

737 (17 decks)

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