Exam (elaborations)
B-747 ELECTRICAL QUESTIONS AND ANSWERS
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B-747 ELECTRICAL QUESTIONS AND ANSWERS....
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What does the "AVAIL" light indicate on the External and APU PWRswitches? - ANSWER The related power source APU or EXT is
plugged in and available, and the power quality is acceptable.
What bus is powered on the ground when APU generator 1 or external
power 1 is available? - ANSWER Ground Handling Bus
When is the main cargo deck handling bus powered? - ANSWER
When the "AVAIL" light is displayed on APU 2 or EXT 2
What electrical power source would you select if cargo handling is
required? - ANSWER APU 1 or EXT 1
When is the ground service bus powered? - ANSWER When AC BUS
1 is powered on the ground or in flight, or when the button is pressed at
door 1L on the ground
What is the function of the standby power switch in the AUTO position? -
ANSWER Allows the main and APU standby busses to be powered
from available sources
Where would you find the Electrical Power-up procedure? - ANSWER
FCOM Volume 1 Supplemental Procedures
What does a Bus Isolation (ISLN) light illuminated indicate? - ANSWER
- BTB Open
- AC Bus Isolated from the synchronous bus
What happens when you push a Generator Drive Disconnect (DRIVE
DISC) switch? - ANSWER - Disconnects the IDG when above idle
speed
- Opens related Generator Control Breaker (GCB)
, What condition would automatically disconnect the IDG if not manually
disconnected by the flight crew? - ANSWER High IDG oil temperature
How do you reconnect an IDG that has already been disconnected? -
ANSWER IDG cannot be restored by the flight crew
What does a Generator DRIVE light Indicate? - ANSWER - IDG oil
temperature High
- IDG oil pressure Low
- Generator Control Breaker open due to fault
What are some of the equipment items powered by the Utility Busses? -
ANSWER - FWD main pumps 2 & 3
- FWD override/jettison pumps 2 & 3
- Center override/jettison pump
- Galley Equipment (Freighter)
Describe the electrical load shedding process by the Electrical Control
Load Unit (ECLU)? - ANSWER Utility Bus shed in prioritized order by
the ECLU
What is the purpose of the electrical system overload protection? -
ANSWER To ensure power is available to critical and essential
equipment
During load shedding, would you expect to see an EICAS Advisory
message ELEC UTIL BUS L, R? - ANSWER No, This message is
inhibited during load shedding process.
What are the main AC electrical power sources? - ANSWER - 4 IDGs
- 2 APU Gens
- 2 EXT PWR
Describe the function of the Split System Break (SSB)? - ANSWER -
Divides the synchronous bus, allowing each side of the AC electrical
system to be powered by separate auxiliary or external power sources.
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