Where is the red disc indicator located that shows the APU bottle has not been discharged?

Where is the red disc indicator located that shows the APU bottle has not been discharged?

• A. On the upper fuselage
• B. In the cockpit
• C. In the tailcone
• D. On the aft fuselage, just below the right horizontal stabilizer

Answer: (D)

The thing being tested is where you visually check the status of the APU fire bottle. The red disc you look for is an external discharge indicator that shows whether the APU bottle has not discharged yet. It’s placed on the aft fuselage, just below the right horizontal stabilizer, because that area sits right near the APU installation in the tail and is easily visible from outside without opening panels. If the bottle has not discharged, you’ll see the red disc; once the bottle discharges, that indicator would no longer be visible, signaling that discharge has occurred. The other locations aren’t used for this status indicator, since it needs to be this exterior tail-area position for quick verification.

The thing being tested is where you visually check the status of the APU fire bottle. The red disc you look for is an external discharge indicator that shows whether the APU bottle has not discharged yet. It’s placed on the aft fuselage, just below the right horizontal stabilizer, because that area sits right near the APU installation in the tail and is easily visible from outside without opening panels. If the bottle has not discharged, you’ll see the red disc; once the bottle discharges, that indicator would no longer be visible, signaling that discharge has occurred. The other locations aren’t used for this status indicator, since it needs to be this exterior tail-area position for quick verification.