AMS 272 UNIT 3 | QUESTIONS AND ANSWERS | 2026 UPDATE | 100% CORRECT
What does the load compressor provide? - (ANSWER)Pneumatic air for heating, cooling, anti-ice, and
engine starting.
What places the heaviest demand on the APU? - (ANSWER)Load Compressor
What is the APU's starting system? - (ANSWER)electrical starter motor and apu battery
Where does the APU draw fuel from? - (ANSWER)The main fuel tank
Does APU rpm fluctuate depending on loads? - (ANSWER)No, remains constant after start-up
How is the APU EGT modulated? - (ANSWER)With the Load Control Valve
Describe the fuel flow of APU - (ANSWER)No. 1 tank, APU fuel shutoff valve, fuel heater, fuel control
valve, fuel solenoid valve, turbine fuel nozzles
Function of APU Turbine Wheel - (ANSWER)Absorbs the power of the escaping gases of combustion. The
blades in the wheel are NOT for producing thrust
On a B737, at what altitude can an APU provide electrical and pneumatic demand? - (ANSWER)0 -
10,000 ft
On a B737, at what altitude can an APU provide electrical or pneumatic demand? - (ANSWER)10,000 -
17,000ft
On a B737, at what altitude can an APU provide only electrical demand? - (ANSWER)17,000 - 37,000 ft
What is the purpose of the fuel heater? - (ANSWER)Prevent ice from blocking the fuel filters, uses
pneumatic air for heating
What does the load compressor provide? - (ANSWER)Pneumatic air for heating, cooling, anti-ice, and
engine starting.
What places the heaviest demand on the APU? - (ANSWER)Load Compressor
What is the APU's starting system? - (ANSWER)electrical starter motor and apu battery
Where does the APU draw fuel from? - (ANSWER)The main fuel tank
Does APU rpm fluctuate depending on loads? - (ANSWER)No, remains constant after start-up
How is the APU EGT modulated? - (ANSWER)With the Load Control Valve
Describe the fuel flow of APU - (ANSWER)No. 1 tank, APU fuel shutoff valve, fuel heater, fuel control
valve, fuel solenoid valve, turbine fuel nozzles
Function of APU Turbine Wheel - (ANSWER)Absorbs the power of the escaping gases of combustion. The
blades in the wheel are NOT for producing thrust
On a B737, at what altitude can an APU provide electrical and pneumatic demand? - (ANSWER)0 -
10,000 ft
On a B737, at what altitude can an APU provide electrical or pneumatic demand? - (ANSWER)10,000 -
17,000ft
On a B737, at what altitude can an APU provide only electrical demand? - (ANSWER)17,000 - 37,000 ft
What is the purpose of the fuel heater? - (ANSWER)Prevent ice from blocking the fuel filters, uses
pneumatic air for heating
