737 Discrete Lights

Question 1

BLEED TRIP OFF

Answer 1

Engine bleed air TEMPERATURE or PRESSURE exceeds predetermined limits.

Automatically closes related engine bleed air valve

Can be reset with Trip Reset switch if condition is corrected

Question 2

APU GEN OFF BUS

Answer 2

APU has been stated

Question 3

DUAL BLEED

Answer 3

The two circumstances when the light will illuminate are:

The APU bleed air valve is open and the No. 1 engine BLEED Air switch is ON.

Or, the APU bleed air valve is open, the No. 2 engine BLEED Air switch is ON, and the isolation valve is open.

Therefore at this point before engine start, it is normal for the DUAL BLEED light to be illuminated.

Question 4

WING-BODY OVERHEAT

Answer 4

A leak is detected.

Cannot be reset by pressing Trip Reset.

The left WING-BODY OVERHEAT annunciator provides detection for the left engine strut, left inboard wing leading edge, left air conditioning bay, keel beam, and bleed duct from the APU.

The right WING-BODY OVERHEAT annunciator provides detection for the right engine strut, right inboard wing leading edge, and right air conditioning bay.