Electrical Flashcards
What is the secondary power source for the Main Standby bus?
Main standby inverter
During autoland below 1500’, automatic isolation of which buses occurs?
AC and DC buses 1, 2, 3
What is the secondary power source for the FO transfer bus?
AC Bus 1
What does the main deck cargo handling bus power?
Nose and side cargo doors
When is the main deck cargo handling bus powered?
APU Gen 2 or Ext PWR 2 is AVAIL
What does the ground service bus powers?
- Flight deck flood,
- Nav and service lights,
and - Battery chargers
If AC bus 1 is unpowered on the ground how can the Ground Service Bus be powered?
GND SERVICE switch at Door 1L
How is the Ground Service Bus normally powered?
AC bus 1
What does the Ground Handling Bus power?
- Lower lobe cargo handling equipment and lights;
and - AUX hydraulic pump 4 (and 1 if installed).
When is the Ground Handling Bus powered?
When APU GEN 1 or EXT PWR 1 is avail or ON
How is the Main Standby Bus normally powered?
AC Bus 3
What is the secondary power source for the Captain Transfer Bus?
AC Bus 1
How is the FO transfer bus normally powered
AC Bus 2
What does the Main Standby Bus power?
Left:
1) EIU,
2) CDU,
3) ILS,
4) VOR,
5) ADC,
6) Transponder,
7) EFIS panel.
The Split System Breaker opens and divides the synchronous bus allowing what to happen?
Separate APU or EXT sources to power each side
Which bus powers fire detection for the APU and engines?
APU Battery Bus
What buses isolate when a BTB is manually selected to ISLN?
The associated AC and DC buses
The synchronous bus allows how many IDGs to be connected at the same time?
4
What is the purpose of the sync bus?
To prevent an AC bus from becoming unpowered, if its respective generator fails.
How does each AC bus connect to the synchronous bus?
BTB