ATA 24 Electrical Flashcards
What are the 4 main AC power and 1 standby source?
Ground power, both IDG’s, and APU power, and the batteries are the standby DC power.
The Electrical Meters, Battery, and Galley Power Module P5-provide front face BITE for ____________.
Standby power and DC generation system.
The ELEC light on the Electrical Meters, Battery, and Galley Power Module
illuminates in the air or on ground to indicate a DC or standby power system fault
True or False.
True
Light does not come on in Flight
How is IDG oil cooled?
Air/oil cooler located on the engine fan case.
What could an illuminated IDG drive light indicate?
Low oil pressure
The APU Generator Unit (AGCU) uses __________ ____________ located inside the SCU to control APU starter-generator output.
voltage regulator
List the functions of an engine generator GCU.
Monitors the power quality at the IDG and feeder lines in the power distribution panels.
Where can you find SCU ?
E2 rack EE bay
Which panel can you find SPCU?
P6
The GEN OFF BUS light is ____ in colour and indicates that the __________ __________ ___________ is _________.
Blue, Engine Generator Control Breaker (GCB) is open.
Where are the DC electrical power parameters displayed?
P5-Overhead panel beside the AC volts/amps indication.
What is the purpose of the SPCU?
Controls DC power generation
The TR UNIT amber light is on in flight, what does this indicate?
TR unit failure
What is the normal power source for the battery bus?
Transformer rectifier units
What is the normal power source for the AC standby bus?
AC transfer bus 1 or
the static inverter
What is the “standby power” source for the DC standby bus?
DC Bus 1 or
the hot battery bus
The static inverter RCCB is normally ______.
Closed
What controls the blue GND POWER AVAILABLE light?
External Power Contacter?
After the external power contactor is energized closed, how is it kept closed?
BPCU?
Can you power only the ground service buses, is so the how?
Yes, via the the AC transfer bus on that side has power or the ground service switch is on and there is external power connected to the aircraft
AC transfer bus on
ground service switch is on
external power connected to the aircraft
How is BPCU BITE performed?
You flick the test switch to turn off any faults and do a test of the BPCU, at the end of the test only the BPCU pass or fail light should come on.
Where are the power distribution panels located?
E and E Bay
What controls load shedding?
The load shed relays
Where ca you find standby power Unit?
P6
