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Atlas/Southern 737-400 > Electrical > Flashcards

Electrical Flashcards

1
Q

What causes STANDBY POWER light to illuminate?

A

AC standby bus unpowered

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2
Q

Standby power system main components (7)

A 
Battery
Static Inverter
AC standby bus 
DC standby bus, 
Battery bus, 
Hot battery bus 
Switched hot battery bus
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3
Q

Standby Power Switch in AUTO / AC transfer buses powered

in flight or on ground

A

AC Standby Bus is powered by AC transfer bus 1

DC standby bus is powered by DC bus 1

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4
Q

Standby Power Switch in AUTO / loss of all AC power

in flight or on ground

A

(in flight)
AC Standby bus is powered by battery via static inverter
DC standby bus is powered by battery bus

(on ground)
AC & DC Standby bus are both powered by the battery bus

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5
Q

Standby Power Switch OFF

A

STBY POWER OFF light illuminates

AC Standby,static inverter, and DC standby bus are not powered

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6
Q

Standby Power Switch to BAT

A

AC Standby bus is powered by battery via static inverter

DC standby bus is powered by battery bus

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7
Q

Primary electric power is provided by?

A

2 engine driven generators and an APU which each supply 3 phase, 115v, 400hz, AC power.

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8
Q

What supplies primary DC power

A

3 TRUs and a 24v battery supply 28v DC power

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9
Q

Battery Power

A

24v nickel cadmium battery can supply standby power for 30 min. Voltage range is 22-30v

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10
Q

Generator Drive Unit (GDU)

A

Provides constant frequency through normal operating range of the engine. Generator is coupled directly to the engine. Each GDU has self contained with its own oil, cooler, instrumentation and disconnect device.

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11
Q

AC power system main components

A 
Each AC system consists of a 
gen bus, 
main bus, 
transfer bus, 
left side also includes ground service bus.
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12
Q

What supplies power to AC standby system?

A

AC transfer bus 1

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13
Q

Bus transfer system

A

Gen buses supply heavy electrical loads
transfer buses carry essential electrical loads
main buses carry non essential loads

If a gen trips off, Gen bus and main bus will not be powered. Each transfer bus has a transfer relay which automatically selects opposite gen bus as its power source. (switch must be in auto)

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14
Q

TRU’s

A

Convert 115vac to 28 vdc.

TRU1 and 2 powered by DC bus 1 and 2

TRU3 powers the battery bus and is backup for TRU 1/2

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15
Q

TR3 disconnect relay automatically opens for what?

A

Isolates DC bus 1 from DC bus 2 at glideslope capture during FD or AP ILS preventing single failure from affecting both NAV receivers and FCCs.

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16
Q

DC busses powered from battery following loss of both generators?

A

battery bus /
DC standby bus /
hot battery bus /
switched hot battery bus

17
Q

Battery charger powered by?

A

AC ground service bus

18
Q

purpose of residual volts switch?

A

With gen switch OFF residual voltage is shown on voltmeter.

Atlas/Southern 737-400 (11 decks)

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