Electrical System

Question 1

The STANDBY PWR OFF (amber) light when illuminated, indicates one or more of the following busses are unpowered:
______ or ______ or _______

Answer 1

AC Standby Bus or DC Standby Bus or Battery Bus

Question 2

When does the BAT DISCHARGE
light (amber) illuminate?

Answer 2

When excessive battery discharge is detected on the main battery and/or auxiliary battery.

Question 3

When will the Generator DRIVE
(amber) light illuminate?

Answer 3

When there is a IDG failure /
engine shutdown / IDG disconnected by activation of the DISCONNECT switch /
IDG auto-decouple due to high oil temperature (182 C).

Question 4

How long will two fully-charged batteries
provide standby power?

Answer 4

Two fully-charged batteries have sufficient capacity to provide standby power for a minimum of 60 minutes.

Question 5

What does the BUS TRANSFER switch,
in the AUTO (guarded) position, allow?

Answer 5

Allows the Bus Tie Breakers (BTB) to operate automatically to maintain power to AC transfer busses from any operating generator or external power.