Alaska Boeing 737 MAX > 06 - Electrical > Flashcards

06 - Electrical Flashcards

(24 cards)

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1
Q

ELECTRICAL

  1. What are the sources of DC power?
A
  • 3 TRUs
  • 2 24-volt NICAD batteries, main and aux.
  • battery charger TR

SH 6.010 p14

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2
Q
  1. What happens when an IDG is decoupled?
A

The splined IDG drive shaft is retracted out of the gearbox for complete drive decoupling from engine rotation

SH 6.010 p4

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3
Q
  1. What causes the illumination of the DRIVE light?
A

IDG experiencing low oil pressure caused by:
- Engine shutdown
- IDG mechanical failure
- IDG disconnected by DISCONNECT switch
- IDG auto-decouple due to high oil temperature

SH 6.010 p4

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4
Q
  1. When is the GRD POWER AVAILABLE light illuminated?
A

External power cord is connected to the aircraft and the power is checked to be within tolerances and available for connection to the AC buses

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5
Q
  1. What are the basic principles of AC power distribution with the 737 electrical system?
A
  • There is no paralleling of AC power sources
  • The source of power being connected to a transfer bus automatically disconnects an existing source

SH 6.010 p8

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6
Q
  1. How is the AC standby bus normally powered?
A

By AC transfer bus 1

SH 6.010 p8

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7
Q
  1. What is indicated by a GEN OFF BUS light?
A

An IDG is not supplying power to the transfer bus

SH 6.010 p11

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8
Q
  1. Is it possible to power one AC transfer bus with external power and the other AC transfer bus with APU power?
A

No. As soon as the GRD PWR switch is selected ON (with GRD POWER AVAILABLE illuminated), the BTB will close supplying external power to both transfer buses

SH 6.010 p9

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9
Q
  1. What is the load shedding logic when only one source of AC power is available?
A

APU;
- on ground it attempts to carry the full electrical load
- in flight, if the APU is the only source of power, all main and galley buses are automatically shed
Single IDG;
- sheds transfer bus 2 main and galley buses
- sheds transfer bus 1 main and galley buses
- IFE buses

SH 6.010 p12

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10
Q
  1. What is the automatic generator on-line feature?
A

In the event an aircraft takes off with the APU powering both transfer buses and the APU is subsequently shut down or fails, the IDGs are automatically connected to their related transfer buses. This feature only occurs once per flight cycle.

SH 6.010 p12

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11
Q
  1. How long can two fully-charged batteries provide standby power?
A

A minimum of 60 minutes

SH 6.010 p14

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12
Q
  1. When does the DC cross bus tie relay open?
A

With the BUS TRANS switch in AUTO, the cross bus tie opens when Glide Slope is active during a FD or AP ILS approach

SH 6.010 p16

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13
Q
  1. How is the DC standby bus normally powered?
A

By TR1, TR2, or TR3

SH 6.010 p15, 18

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14
Q
  1. The BAT switch controls which bus(ses)?
A

The switched hot battery bus and battery bus

SH 6.010 p16

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15
Q
  1. What does the illumination of the BAT DISCHARGE light on the AC and DC Metering panel indicate?
A

An excessive discharge of the main battery and/or auxiliary battery

SH 6.010 p16

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16
Q
  1. What is the purpose of the static inverter?
Study These Flashcards
A

To power the AC standby bus

SH 6.010 p17

17
Q
  1. What does the illumination of the TR UNIT light indicate?
Study These Flashcards
A
  • On ground; failure of TR1, TR2, or TR3
  • In flight; failure of TR1, or TR2 and TR3

SH 6.010 p17

18
Q
  1. With the loss of all AC power, if automatic switching does not occur, how can the standby power buses be powered?
Study These Flashcards
A

By placing the STANDBY POWER switch to BAT

19
Q
  1. What causes the illumination of the STANDBY PWR OFF light?
Study These Flashcards
A

One or more of the following buses are unpowered;
- AC Standby bus
- DC Standby bus
- Battery bus

SH 6.010 p19

20
Q
  1. What does the illumination of the ELEC light indicate and when is it armed?
Study These Flashcards
A

When a fault in the Standby Power or DC Power System occurs. It is only armed on the ground (inhibited in flight).

SH 6.010 p19

21
Q
  1. If all generators are inoperative, and the main battery and the auxiliary battery are the only sources of power, which Display Units are available on the MAX?
Study These Flashcards
A
  • Captain’s outboard DU with PFD
  • Captain’s inboard DU with ND & Engines

SH 6.010 p22-24

22
Q

EXTRA CREDIT

  1. In this configuration, what source of AC power is supplying the bus; APU or GRND PWR
23
Q

EXTRA CREDIT

  1. In this configuration, what source of AC power is supplying the bus; APU or GRND PWR
24
Q

EXTRA CREDIT

  1. If all generators are inoperative, and the main battery and the auxiliary battery are the only sources of power, which Display Units are available on the NG?
Study These Flashcards
A
  • Captain’s outboard DU with PFD
  • Captain’s inboard DU with ND
  • Upper DU (TAT, N1, EGT, N2, FF, Oil Press, Oil Temp, Oil Qty, VIB, Fuel Qty, & ENG annunciations)

SH 6.010 p1-4

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