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

ELECTRICAL SYSTEM Flashcards

(62 cards)

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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
25. When you connect external power to the | airplane electrical system, are both TB’s powered?
 Yes
26
26. If the APU is powering the TB’s and EXT PWR | is selected ON, how many busses will EXT power?
 All
27
27. What does a TRANSFER BUS OFF light mean?
 Transfer bus not powered
28
28. What does a GEN OFF BUS light mean?
 IDG not supplying power to the TB
29
29. What does a SOURCE OFF light mean?
 Respective IDG not powering bus or previously selected source no longer  powering bus
30
30. What does the BUS TRANSFER switch do?
 Enables or disables autobus switching
31
31. What does the APU GEN OFF BUS light mean?
 APU GEN available but not powering any busses
32
32. If the APU is supplying power to both TB’s and one APU GEN switch is moved to OFF, what happens?
 That source off light illuminates and both transfer busses remain powered
33
33. What happens in flight if an IDG fails?
 Auto bus transfer allows other IDG to power failed side IDG’S TB
34
34. How many TR’s are there?
 Four (TR#1, TR#2, TR#3, and Battery Charger)
35
35. What normally supplies power to the standby AC bus; if AC power is not available?
 TB #1; inverter
36
36. Is it possible to power one TB from EXT and | one TB from APU?
 No
37
37. Is it possible to power one TB from EXT or | APU and one TB from an IDG?
 Yes
38
38. Is ground service available without powering | all of the airplane busses?
 Yes
39
39. How is the ground service available without powering all the a/c busses accomplished? 
 Ground service switch on fwd FA panel
40
40. What happens if you takeoff with the APU powering both TB’s and the APU fails?
 Auto connect to engine IDG’S one time only (flight only)
41
41. For single generator operation, is load shedding automatic or manual?
 Automatic
42
42. Which components are shed automatically?
 (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
43. In flight, if the APU is the only available power source do you have to manually load shed?
 No
44
44. How is the load shed when the APU is the only | power source?
 (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
45. On the ground, will the APU load shed?
 The APU attempts to carry the full electrical load except during engine start
46
46. Is load restoration automatic or manual?
 Automatic
47
47. Can you manually restore galley power? How?
 maybe, cycle galley switch and see
48
48. What would an IDG automatically disconnect | for?
 High IDG oil temperature
49
49. Can a disconnected IDG be reconnected in | flight?
 No
50
50. What normally powers: |  DC BUS #1?
a. TR1, 2, and 3
51
51. Normally, are DC BUS #1 and DC BUS #2 isolated?
 No
52
52. When are the main DC BUSSES isolated | automatically?
 At glideslope intercept
53
53. How can you isolate the DC BUSSES | manually?
 Bus transfer switch off
54
54. How long will a fully charged battery be able | to supply standby power?
 30 minutes (single battery option) |  1 hour (dual battery option)
55
55. Does STANDBY POWER include one attempt | at starting the APU (fully charged battery)?
 Yes (not recommended above FL250)
56
56. What busses are powered by the battery after | loss of both generators?
```  Hot battery bus  Switched hot battery bus  Battery bus  Standby AC  Standby DC  Static inverter ```
57
50. What normally powers: |  DC BUS #2?
a. TR1, 2, and 3
58
50. What normally powers: |  STBY AC BUS?
a. TB#1
59
50. What normally powers: |  STBY DC BUS?
a. TR1, or all TRs.
60
50. What normally powers: |  BATT BUS
a. TR#3
61
50. What normally powers: |  HBB
a. BATT CHG/TR
62
50. What normally powers: |  SHBB
a. BATT CHG/TR
x. ORAL STUDY GUIDE - 737NG
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