ATA 49 APU

What is the primary function of the Auxiliary Power Unit (APU)?. Electrical power generation. Wing anti-ice. Fuel storage.

Besides electrical power, what else does the APU provide?. Air conditioning in-flight, bleed air for various functions. Oxygen supply. Navigation assistance.

When does the air intake flap open and close?. Opens when APU is ON, closes when OFF. Opens when the main engines are running. Opens during takeoff, closes during landing.

What is the purpose of the air intake flap?. Pneumatic supply, combustion air supply. Preventing fires. Pneumatic supply.

Where is the APU installed on the aircraft?. In the fuselage tail cone. In the landing gear. In the wing.

How is vibration transmission reduced between the APU and the aircraft structure?. Through isolators, tie rods. Through air intake. Through exhaust muffler.

How is the APU attached to the structure brackets in the APU compartment ceiling?. Through tie rods. Through adhesive. Through welding.

What is the purpose of the vibration isolators in the APU mounting system?. To reduce noise, prevent transmission of vibrations. To connect to the APU three- point mounting system. To transfer vibrations to the aircraft structure.

What is the primary purpose of the drain system in the APU compartment?. To prevent fluid accumulation. To collect APU exhaust gases. To supply water for aircraft cleaning.

w are fluids collected and removed from the APU compartment?. Through a drain mast when the aircraft is above 200 kt. Through an APU fuel line. Through an APU exhaust pipe.

The Auxiliary Power Unit (APU) is a constant-speed ________ engine. gas turbine. propeller. jet.

The APU provides electrical power for the aircraft systems, bleed air for various functions, and bleed air cutoff above the specified ________ limit. manufacturer. speed. temperature.

The air intake flap opens when the APU MASTER SWITCH is set to ON and closes when the MASTER SWITCH is set to OFF and the APU ________. When open, it supplies air to the APU inlet for combustion and pneumatic supply. stops. accelerates. stalls.

In case of failure, the air intake flap can be opened or closed manually by a manual ________ device. override. switch. lever.

The APU is installed in a fireproof compartment located in the fuselage ________ cone. tail. nose. cockpit.

Vibration isolators are installed between the APU mount brackets and the tie rods to reduce the transmission of A/C vibrations and shocks to the APU. The isolators also prevent the transmission of vibrations from the APU to the A/C ________. structure. engine. wings.

the air intake system ducts ambient air to the APU plenum chamber, an air intake flap cuts off the air supply when the APU does not operate in case of failure the air intake flap can be opened or closed manually by a manual ______ device. override. switch. lever.

the air intake duct which is composed of a diffuser and elbow, provides correct airflow to the APU plenum the air intake ducts is attached to the________ access door. right. rear. top.

the exhaust system lets the APU exhaust gas flow into the atmosphere and muffles the_____ from the exhaust, the exhaust muffler thermal insulation protects the A/C structure. noise. vibration. heat.

the exhaust muffler thermal insulation protects the A/C_____. structure. cockpit. engines.

two access door allow access to the APU compartment the access door on the bottom of the tail cone open_____ to allow the APU to be inspected lifted and lowered. outward. downward. upward.

two access door allow access to the APU compartment the access door on the bottom of the tail cone open outward to allow the APU to be inspected, lifted and_________. lowered. raised. secured.

a drain system prevents the collection of fluids in the APU compartment any fluid that may accumulate in the APU compartments is delivered to a________ mast some of the fluids are collected in a drain tank in the APU compartment which is emptied through the drain mast when the A/C is above 200 kt. drain. hydraulic. water.