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737 > Engines&apu > Flashcards

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
Q

An illuminated APU DET INOP light when no fire warning test is being performed

A

Requires the APU to be shut down, if operating because the detector is inop

26
Q

After an inflight APU start, the APU will supply____

A

Pneumatic load only up to 17000 ft

27
Q

The max allowable EGT for the APU is

A

760 degrees C maximum, 710 degrees C max continuous

28
Q

After aborting an ASpU start , how soon may another start be atttempted

A

After 4 minutes

29
Q

Successful APU starts are not assured above

A

Fl250

30
Q

What is the primary function of the Main Engine Control

A

Hydromechanical control of the fuel

31
Q

What is the automatic function of the PMC during a climb

A

Maintain initial n1 climb thrust throughout climb

32
Q

When is Engine speed commanded to LOW IDLE

A

On the ground, four seconds after touchdown

33
Q

How is the main fuel shutoff valve at the engine spar operated

A

Electrical control by the engine start lever and fire switch

34
Q

A dim FUEL VALVE CLOSED light indicates

A

Engine fuel control shutoff valve(MEC valve) is closed

35
Q

What does an illuminated furl FILTER BYPASS light indicate

A

Impending bypass of the engine fuel filter

36
Q

How is the Main Engine Control (MEC) fuel shutoff valve operated? (This valve is at the engine fuel control)(500)

A

Mechanically by the engine start lever

37
Q

What does the engine oil pressure indicator show

A

Unregulated pressure as a function of N2 speed

38
Q

What is indicated when the OIL FILTER BYPASS light illuminates

A

The scavenge oil filter is contaminated

39
Q

The engine oil temperature indicator shows oil temp coming out of the engine prior to the oil cooler

A

True

40
Q

During engine start, the start switch disengages at ____N2

A

46%

41
Q

The _____shows the current mode of the N1 limit computed by the FMC

A

Thrust Mode Annunciator

42
Q

The engine accessory components are driven by

A

The N2 spool

43
Q

With the engine at normal operating temp and idle, the oil PRESSURE must be

A

Above the red radial

44
Q

Engine fan air cools

A

The CSD/Generator

45
Q

With the engine at climb N1 limit power , the ____ stage pneumatic bleed provides bleed air for the pneumatic system

A

5th

46
Q

The power to move the engine thrust reversers is

A

Hydraulic

47
Q

Engine oil is cooled by

A

Engine fuel flow

48
Q

Reverse thrust operation is permitted for

A

Ground use only

49
Q

Max eng N1 limit

500

A

106%

50
Q

Max eng N2

500

A

105%

51
Q

Max takeoff EGT

500

A

930 C

52
Q

Max continuous EGT

500

A

895C

53
Q

Max starting EGT

A

725 C

54
Q

Min oil pressure for continued engine operation

A

13 psi

55
Q

An engine must be shut down if oil temp exceeds

500

A

165C

56
Q

Which is the correct PMC switch configuration for takeoff

A

Both must be ON or both INOP(OFF)

57
Q

New Gen aircraft APU gen willpower both Transfer Busses inflight

A

True

58
Q

700 aircraft is parked at gate with APU running. Turning APU control seitch to OFF

A

Causes shutdown after 1minute

59
Q

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

A

41000ft

737 (17 decks)

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