Systems Study

Question 1

Amber DRIVE light above IDG switch?

Answer 1

Low oil pressure in IDG unit

Possible causes include:

• Engine shutdown
• high oil temp
• Auto disconnect
• Manual disconnect

Question 2

Amber ELEC light on electrical panel?

Answer 2

A fault exists in DC power system or standby power system

Inhibited in flight

Question 3

When is the Cross Bus Tie Relay open?

Answer 3

At glideslope capture during flight director or autopilot ILS approach.

Bus transfer switch OFF

Question 4

Power source for battery charger?

Answer 4

AC ground service bus 2

Battery charger is a TR

Question 5

When can you not use VNAV for departure?

Answer 5

If T-procedure requires:

• completion of a turn to specified heading before accelerating, or
• becoming established on a defined lateral course before accelerating.

Known windshear conditions (may lose FD guidance at 400 feet