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Delta 73N > Electrical > Flashcards

Electrical Flashcards

1
Q

Describe the function of the GROUND SERVICE switch on the fwd F/A panel

A

Provides manual control of ground service busses. Enables servicing of airplane using external power without activating AC transfer busses.

ON - connects external power to ground service bus
OFF - disconnects external power from ground service bus

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2
Q

Explain the meaning of the blue GRD POWER AVAILABLE light

A

Illuminated (blue): ground power is connected and meets airplane power quality standards

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3
Q

Explain the meaning of the blue APU GEN OFF BUS light

A

Illuminated (blue): APU is running and not powering a bus

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4
Q

Explain the meaning of the blue GEN OFF BUS light

A

Illuminated (blue): IDG is not supplying power to the related transfer bus

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5
Q

Recall where to read voltage, frequency and amps

A

AC and DC metering panel on the fwd ovhd panel

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6
Q

Explain the meaning of the amber DRIVE light

A

Illuminated (amber): IDG low oil pressure

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7
Q

Explain the meaning of the amber TRANSFER BUS OFF light

A

Illuminated (amber): related transfer bus is NOT powered
Extinguished: related transfer bus is powered

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8
Q

Explain the meaning of the amber SOURCE OFF light

A

Illuminated (amber): no source has been manually selected to power the related transfer bus, or the manually selected source has been disconnected

Note: SOURCE OFF light triggers ELEC light and Master Caution to alert crew of change to source of power to associated transfer bus

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9
Q

Explain the meaning of the amber BAT DISCHARGE light

A

Illuminated (amber): with BAT switch ON, excessive battery discharge detected

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10
Q

Explain the meaning of the amber TR UNIT light

A

Illuminated (amber): TR failure

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11
Q

Explain the meaning of the amber ELEC light

A

Illuminated (amber): fault exists in DC power system or standby power system

Note: operates only with airplane on ground

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12
Q

Explain the meaning of the amber STANDBY PWR OFF light

A

Illuminated (amber): one or more of the following busses are unpowered:
- AC standby bus
- DC standby bus
- Battery bus

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13
Q

Recall the number of minutes available on standby power with two fully charged batteries

A

60 minutes

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14
Q

Recall the function of the GRD PWR switch

A

Three position switch, spring loaded to neutral:
- OFF: disconnects ground power from AC transfer bus
- ON: if momentarily moved to ON position and ground power is available:
- removes previously connected power from AC transfer busses
- Connects ground power to AC transfer busses when power quality is correct

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15
Q

Is it possible to use APU and GRD power simultaneously?

A

No
There are two basic principles of operation for the 737 electrical system:
- No paralleling of AC sources of power
- The source of power being connected to a transfer bus automatically disconnects the existing power

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16
Q

Recall the function of positioning the APU GEN switches ON

A

3 position switch, spring loaded to neutral

Neither AC transfer bus power by an IDG:
Moving an APU GEN switch to ON:
- Powers both AC transfer busses from the APU generator
- Disconnects external power, if connected
- Opposite SOURCE OFF light illuminates until the APU GEN switch is moved ON

Both AC transfer busses powered by IDGs
Moving an APU GEN switch to ON:
- Powers the related AC transfer bus from the APU generator
- Other AC transfer bus continues to receive power from the IDG

17
Q

Explain the function of the BAT switch

A

ON:
- Provides battery power
- Provides automatic switching of standby electrical system to battery power with loss of normal power

OFF:
- Removes battery power

18
Q

Recall the components powered by the ground service bus

A
  • Utility outlets
  • Cabin lighting
  • Battery chargers
19
Q

Recall the components powered by the ground service bus

A
  • Utility outlets
  • Cabin lighting
  • Battery chargers
20
Q

Recall the location of the GROUND SERVICE switch

A

The fwd flight attendant control panel

21
Q

Recall the function of the GEN switches

A

Three position switch spring loaded to neutral

OFF - disconnects IDG from related AC transfer bus by opening generator circuit breaker
ON - connects IDG to related AC transfer bus by disconnecting previous power source and closing generator circuit
breaker

22
Q

Recall the function of the BUS TRANSFER switch

A

AUTO: bus tie breakers operate automatically to maintain power to AC transfer busses from any operating generator or external power

OFF: isolates AC transfer bus 1 from AC transfer bus 2

23
Q

Recall the function of the generator drive disconnect (DISCONNECT) switches

A

Disconnects IDG if electrical power is available and engine start lever is in IDLE
IDG cannot be reconnected in the air

Delta 73N (17 decks)

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