Electrical Flashcards
What is the maximum amperage of the engine-driven generators?
400 amps. AOM 2-05-05 page 1.
What is the maximum amperage of the APU generator?
400 amps up to and including 30,000 ft, 300 amps above 30,000 ft.
AOM 1-01-32 page 1.
What are the battery specifications?
24 VDC, 44 Ah NiCad (2). AOM 2-05-05 page 6.
Can the GPU charge the batteries?
No. AOM 2-05-05 page 6
What is the minimum battery temperature for APU start?
-20°C. AOM 1-01-38 page 1.
Which bus supplies power to the inverter?
DC Bus 1. AOM 2-05-05 page 12
What are the consumers of inverter power?
TCAS II, EGPWS/Windshear. AOM 2-05-05 pa
What light illuminates in the overhead panel GPU button when the GPU is connected and on?
GPU AVAIL. AOM 2-05-05 page 5
What should the GPU voltage indicate on the MFD when it is connected and available?
26 VDC to 29 VDC.
AOM 1-12-05 page 1.
Do the generators or the GPU have priority?
GPU.
AOM 2-05-05 page 5.
Which bus is supplied with power when the GPU is selected and the batteries are OFF?
Ground service bus.
AOM 2-05-05 page 10.
What items are powered from the Ground Service Bus?
AOM 2-05-05 page 10.
- Passenger cabin lights
- Lavatory lights
- Galley lights
- Courtesy/stair lights
- Cockpit dome lights
- Baggage/service compartment lights.
What is considered an electrical emergency?
Loss of all generators.
AOM 2-05-10 page 25.
The batteries can supply essential power for how many minutes in the event of an electrical emergency?
40 minutes, which includes 3 APU start attempts.
AOM 2-05-05 page 6
What does the Essential Power Button do?
Overrides auto transfer (EDL logic) to electrical emergency configuration and ensure batteries power only the Essential Buses. Isolates batteries from DC buses.
AOM 2-05-15 page 3.
On the ground with the batteries as the only power source, do you have shed bus power?
No.
Will selecting OVRD on the SHED BUSES knob connect the shed buses? No.
AOM 2-05-05 page 6.
What requirement is there on the ground in order to connect the shed buses?
SHED BUSES OVRD with at least one generator online. AOM 2-05-05 page 9.
A BATT 1 (2) OVTEMP Warning message occurs at what temperature?
Above 70°C. AOM 2-05-05 page 6.
What is the memory item for battery overtemperature?
Affected Battery…OFF. AOM 1-03-03 page 1.
On the ground, when are all the DC buses energized?
- At least three generators are on
- The GPU is on and connected to the airplane
- At least one generator is on and the SHED BUSES Selector Knob is set to OVRD
AOM 2-05-05 page 9.
