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Flashcards in Engines&apu Deck (59):
1

What elec pwr source is reqd for starting the apu

Aircraft battery

2

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

True

3

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

#1fuel tank

4

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

Cause the apu to shut down

5

What are initial indications when apu is starting

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

6

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

41000 ft if no APU bleed air is used

7

What does an illuminated APU MAINT light indicate

Oil quantity is insufficient for extended operation

8

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

The APU bleed valve modulates toward the closed position

9

What indicates the APU gen is ready for use

When the blue APU GEN OFF BUS light illuminates

10

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

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

11

What causes an automatic shutdown of the APU

Fire warning

12

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

BAT sw placed to OFF

13

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

Fire warning

14

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

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

15

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

All of the answers are correct

16

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

135 secs

17

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

One bus up to 35000 ft

18

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

All answers are correct

19

An illuminated APU GEN OFF BUS light indicates

The APU is at operating speed

20

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

False

21

Minimum battery voltage for APU start is

23 volts

22

APU starter engagement may first be observed by(500)

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

23

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

True

24

What causes an APU OVERSPEED annunciator light to illuminate

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