What does the message BLEED OPEN indicate about the APU status?

What does the message BLEED OPEN indicate about the APU status?

• A. APU is Off
• B. APU is On
• C. Bleed Valve Open
• D. Bleed Valve Closed

Answer: (A)

BLEED OPEN means the bleed air valve is open and bleed air is flowing. On the CRJ-550, that bleed air usually comes from the APU when the APU bleed is in use. So seeing this message indicates the bleed source is active, i.e., the APU is running. If the APU were off, the bleed valve would not be open, so this points to the APU being On.

BLEED OPEN means the bleed air valve is open and bleed air is flowing. On the CRJ-550, that bleed air usually comes from the APU when the APU bleed is in use. So seeing this message indicates the bleed source is active, i.e., the APU is running. If the APU were off, the bleed valve would not be open, so this points to the APU being On.