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x. ORAL STUDY GUIDE - 737NG > ELECTRICAL SYSTEM > Flashcards

ELECTRICAL SYSTEM Flashcards

1
Q
  1. What does IDG stand for?
A

 Integrated drive generator

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2
Q
  1. How many IDG’s does this aircraft have?
A

 Two

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3
Q
  1. Do the AC power sources normally operate paralleled or isolated?
A

 Isolated

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4
Q
  1. What does BAT DISCHARGE light mean?
A

 Excessive battery discharge

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5
Q
  1. What does TR UNIT light mean on the ground?

In flight?

A

 Any TR has failed; TR 1 OR TR 2 and TR 3 have failed

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6
Q
  1. What does the ELEC light mean?
A

 fault in DC or STBY power systems

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7
Q
  1. Will you see the ELEC light in flight?
A

 No, It is a ground only light

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8
Q
  1. When is the ELEC light inhibited?
A

 Inflight

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9
Q
  1. What is the normal IDG frequency?
A

 400CPS

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10
Q
  1. What is the normal IDG voltage?
A

 115volts

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11
Q
  1. What is the normal battery voltage?
A

 24 (22-30voltrange)

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12
Q
  1. If under normal conditions the battery switch

is turned OFF, would the Battery Bus be powered?

A

 No

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13
Q
  1. If under normal conditions the battery switch

is turned OFF, would the Switched Hot Battery Bus be powered?

A

 No

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14
Q
  1. What does the STANDBY PWR OFF light

mean?

A

 STBY AC, STBY DC, or Battery Bus are not powered

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15
Q
  1. What does the DRIVE light mean?
A

 Low oil pressure in the IDG

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16
Q
  1. What items make up the Standby Power System?
A 
 Hot battery bus
 Switched hot battery bus 
 Battery bus
 Standby AC
 Standby DC
 Static inverter
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17
Q
  1. With the standby power switch in BATT, what is available?
A 
 Hot battery bus
 Switched hot battery bus 
 Battery bus
 Standby AC
 Standby DC
 Static inverter
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18
Q
  1. With the standby power switch in AUTO, what is available?
A

 All busses

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19
Q
  1. With the standby power switch in OFF, what is

available?

A

 Hot battery bus
 Switched hot battery bus
 Battery bus

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20
Q
  1. Can an IDG be automatically disconnected?
A

 Yes, due to high oil temperature

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21
Q
  1. What is the covered Disconnect Switch used for?
A

 When QRH procedure calls for a disconnect

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22
Q
  1. An illuminated GRD POWER AVAILABLE light means what?
A

 Acceptable ground power is available

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23
Q
  1. What checks the incoming EXT PWR for

quality?

A

 Bus power control unit

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24
Q
  1. Does the EXT PWR light have a bright blue/dim blue feature?
A

 No

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25
Q
  1. When you connect external power to the

airplane electrical system, are both TB’s powered?

A

 Yes

26
Q
  1. If the APU is powering the TB’s and EXT PWR

is selected ON, how many busses will EXT power?

A

 All

27
Q
  1. What does a TRANSFER BUS OFF light mean?
A

 Transfer bus not powered

28
Q
  1. What does a GEN OFF BUS light mean?
A

 IDG not supplying power to the TB

29
Q
  1. What does a SOURCE OFF light mean?
A

 Respective IDG not powering bus or previously selected source no longer
 powering bus

30
Q
  1. What does the BUS TRANSFER switch do?
A

 Enables or disables autobus switching

31
Q
  1. What does the APU GEN OFF BUS light mean?
A

 APU GEN available but not powering any busses

32
Q
  1. If the APU is supplying power to both TB’s and one APU GEN switch is moved to OFF, what happens?
A

 That source off light illuminates and both transfer busses remain powered

33
Q
  1. What happens in flight if an IDG fails?
A

 Auto bus transfer allows other IDG to power failed side IDG’S TB

34
Q
  1. How many TR’s are there?
A

 Four (TR#1, TR#2, TR#3, and Battery Charger)

35
Q
  1. What normally supplies power to the standby AC bus; if AC power is not available?
A

 TB #1; inverter

36
Q
  1. Is it possible to power one TB from EXT and

one TB from APU?

A

 No

37
Q
  1. Is it possible to power one TB from EXT or

APU and one TB from an IDG?

A

 Yes

38
Q
  1. Is ground service available without powering

all of the airplane busses?

A

 Yes

39
Q
  1. How is the ground service available without
    powering all the a/c busses accomplished?



A

 Ground service switch on fwd FA panel

40
Q
  1. What happens if you takeoff with the APU powering both TB’s and the APU fails?
A

 Auto connect to engine IDG’S one time only (flight only)

41
Q
  1. For single generator operation, is load shedding automatic or manual?
A

 Automatic

42
Q
  1. Which components are shed automatically?
A

 (Galley Switch Option) galleys on txfr bus 2, then galleys on txfr bus 1, then main bus #2, then main bus #1
 (CAB/UTIL Switch Option) galleys and main bus on txfr bus #2, then galleys and main bus on txfr bus #1, then IFE busses

43
Q
  1. In flight, if the APU is the only available power source do you have to manually load shed?
A

 No

44
Q
  1. How is the load shed when the APU is the only

power source?

A

 (CAB/UTIL Switch Option) in flight, all galley and main busses are shed. If load still too high, the IFE busses are shed (Galley Switch Option) all galleys are shed first; if load is still too high, all main busses are shed

45
Q
  1. On the ground, will the APU load shed?
A

 The APU attempts to carry the full electrical load except during engine start

46
Q
  1. Is load restoration automatic or manual?
A

 Automatic

47
Q
  1. Can you manually restore galley power? How?
A

 maybe, cycle galley switch and see

48
Q
  1. What would an IDG automatically disconnect

for?

A

 High IDG oil temperature

49
Q
  1. Can a disconnected IDG be reconnected in

flight?

A

 No

50
Q
  1. What normally powers:

 DC BUS #1?

A

a. TR1, 2, and 3

51
Q
  1. Normally, are DC BUS #1 and DC BUS #2 isolated?
A

 No

52
Q
  1. When are the main DC BUSSES isolated

automatically?

A

 At glideslope intercept

53
Q
  1. How can you isolate the DC BUSSES

manually?

A

 Bus transfer switch off

54
Q
  1. How long will a fully charged battery be able

to supply standby power?

A

 30 minutes (single battery option)

 1 hour (dual battery option)

55
Q
  1. Does STANDBY POWER include one attempt

at starting the APU (fully charged battery)?

A

 Yes (not recommended above FL250)

56
Q
  1. What busses are powered by the battery after

loss of both generators?

A 
 Hot battery bus
 Switched hot battery bus 
 Battery bus
 Standby AC
 Standby DC
 Static inverter
57
Q
  1. What normally powers:

 DC BUS #2?

A

a. TR1, 2, and 3

58
Q
  1. What normally powers:

 STBY AC BUS?

A

a. TB#1

59
Q
  1. What normally powers:

 STBY DC BUS?

A

a. TR1, or all TRs.

60
Q
  1. What normally powers:

 BATT BUS

A

a. TR#3

61
Q
  1. What normally powers:

 HBB

A

a. BATT CHG/TR

62
Q
  1. What normally powers:

 SHBB

A

a. BATT CHG/TR

x. ORAL STUDY GUIDE - 737NG (18 decks)

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