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Alaska Airlines CQ 2019 > Electrical > Flashcards

Electrical Flashcards

1
Q

What are the two “basic principles of operation” for the 737 Electrical System?

A
  • there is no paralleling of the AC sources of power
  • the source of power being connected to anTransfer Bus automatically disconnects an existing source

Source: Section 6.010
Page 1

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2
Q

What are all the sources of AC power?

A
  • two Engine-Driven Generators
  • one APU Generator
  • external power

Source: Section 6.010
Page 1

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3
Q

What could cause the illumination of the Generator DRIVE light?

A

Low oil pressure caused by

  • IDG failure
  • engine shutdown
  • IDG disconnected by activation of the DISCONNECT switch
  • IDG auto-decouple due to high oil temperature(182C)

Source: Section 6.010
Page 5

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4
Q

What happens when positioning the GRD PWR switch ON?

A

External electrical power is connected to both transfer buses

Source: Section 6.010
Page 7

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5
Q

What does the BUS TRANSFER switch, in the AUTO (guarded) position, allow?

A

Allows the Bus Tie Breakers to opérate automatically to maintain power to the AC Transfer Busses from any operating generator or external power.

Source: Section 6.010
Page 11

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6
Q

Which lights indicate the APU is ready-to-load, but not powering a bus?

A

The APU EN OFF BUS (BLUE) Light

Source: Section 6.010
Page 12

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7
Q

If the the AC Transfer Buses are powered by External Power, momentarily positioning either APU GEN switch ON will cause the APU to power which buses? What lights would you see?

A
  • connects APU power to both transfer buses
  • the opposite SOURCE OFF (amber) light illuminates until the other APU GEN switch is moved to on

Source: Section 6.010
Page 13

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8
Q

When the APU is powering a Transfer Bus, how can you power the opposite Transfer Bus?

A

-either the APU or IDG

Source: Section 6.010
Page 13

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9
Q

What buses are shed when the APU is operating in flight as the single electrical source?

A

Galley busses, main busses are automatically load shed.
-If electrical load still exceeds limits, both IFE busses are automatically shed

Source: Section 6.010
Page 13

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10
Q

Moving a GEN (Generator) switch to ON powers which bus? What lights would you see?

A
  • transfer buses
  • no lights

Source: Section 6.010
Page 14

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11
Q

Describe the Automatic Generator Online Feature.

A

This is a system just in case if the aircraft takes off with the APU powering both Transfer Busses. If the APU is either shut down or fails, the engine generators are automatically connected to their related Transfer Busses. This only occurs once in flight.

Source: Section 6.010
Page 15

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12
Q

What does the ELEC Light (amber) indicate?

A

Indicates that a fault exists in DC Power System or Standby Power System.

Source: Section 6.010
Page 17

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13
Q

When does the Cross Bus Tie Relay open and isolate DC Bus 1 from DC Bus 2?

A
  • at glide slope capture during a Flight Director or Autopilot ILS approach. This isolated the DC Busses during the approach to prevent a single failure from affecting both navigation receivers and Flight Control Computers
  • Bus Transfer Switch positioned to off

Source: Section 6.010
Page 18

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14
Q

Which bus is always connected to the battery?

A

The Hot Battery Bus is always connected to the battery

Source: Section: 6.010
Page 21

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15
Q

When does the BAT DISCHARGE light (amber) illuminate?

A

When excessive battery discharge is detected in the Main Battery and/or Auxiliary Battery

Source: Section 6.010
Page 22

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16
Q

What is/are the alternate power sources for the AC standby power?

A
  • the AC Standby Bus is powered from the batteries via the Static Inverter
  • the DC Standby Bus, Battery Bus, Hot Battery Bus, and Switched Hot Battery Bus are powered directly from the batteries

Source: Section 6.010
Page 25

17
Q

How long will two fully-charged batteries provide standby power?

A

Minimum of 60 minutes

Source: Section 6.010
Page 24

18
Q

With the loss of all engine or APU electrical power, the battery will be powering which buses if the STANDBY POWER switch is in AUTO? Is this the same in flight and on the ground?

A
  • AC Standby Bus, DC Standby Bus, Battery Bus, Hot Battery Bus, and Switched Hot Battery Bus
  • the same in air or on ground

Source: Section 6.010
Page 25

Alaska Airlines CQ 2019 (4 decks)

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