Where is the APU inlet air flap?

Where is the APU inlet air flap?

• A. Bottom of the aft fuselage
• B. Nose section
• C. Top of the fuselage
• D. On the tail cone

Answer: (D)

The APU sits in the tail cone, so its air intake must be right there to feed the engine directly. The inlet flap on the tail cone opens when the APU starts to allow outside air in and closes when the APU isn’t drawing air, protecting the unit and reducing drag. This placement, at the tail cone, keeps the intake away from the main fuselage and away from areas like the nose or top/bottom fuselage where the APU isn’t located. Hence, the inlet air flap is located on the tail cone.

The APU sits in the tail cone, so its air intake must be right there to feed the engine directly. The inlet flap on the tail cone opens when the APU starts to allow outside air in and closes when the APU isn’t drawing air, protecting the unit and reducing drag. This placement, at the tail cone, keeps the intake away from the main fuselage and away from areas like the nose or top/bottom fuselage where the APU isn’t located. Hence, the inlet air flap is located on the tail cone.