A330 ATA 49 APU

Where is the Auxiliary Power Unit (APU) located in the aircraft?. Pressurized tail cone. Engine nacelle. Fuselage mid-section. Unpressurized tail cone.

What are the primary functions provided by the APU?. Electrical power and pneumatic supply. Hydraulic pressure and air conditioning. Avionics cooling and engine lubrication. Fuel pumping and hydraulic pressure.

What controls and monitors the operation of the APU?. Air Traffic Control (ATC). Flight Management System (FMS). Electronic Control Box (ECB). Engine Control Unit (ECU).

What happens to the APU air intake flap when the APU master switch is selected OFF?. Opens. Closes. Adjusts its position to 45 degrees. Remains in the current position.

How does the ECB monitor the oil level status of the APU?. Through an electronic sensor. By visual inspection. By analyzing oil samples. Through pressure readings.

What does it indicate if the "OIL LEVEL: LOW" message is displayed on the APU SERVICE DATA page of the CMS?. The oil level is at its minimum. The oil level is sufficient. The oil level needs checking. The oil level allows for 60 hours of operation.

What should be done prior to servicing the APU oil?. Disconnect the oil hoses. Open the APU access doors. Start the APU. Drain the existing oil.

Which procedure is most commonly used for APU oil servicing?. Pressure fill procedure. Gravity fill procedure. Vacuum fill procedure. Automated fill procedure.

How should the oil filler cap be handled during the gravity fill procedure?. Tighten it immediately after adding oil. Loosen it slowly to release pressure. Remove it completely before adding oil. Shake it to remove excess oil.

The Auxiliary Power Unit (APU) is located in the pressurized zone of the aircraft. True. False.

The APU provides electrical power for the aircraft systems only when the aircraft is on the ground. True. False.

The load compressor diffuser collects static pressure from the compressed air. True. False.

What are the functions of the engine compressor?. Increase air pressure, Guide air into the combustion chamber. Cool the air, Convert air into electrical energy. Increase fuel efficiency, Generate rotational movement. Guide air into the turbine, Increase rotational speed. Convert rotational energy, Supply fuel to the pneumatic system.

What components support the rotating parts of the load compressor?. FWD roller bearing, Aft ball bearing. Lubricated outer race, Deswirl vanes. IGV assembly, Adjustable linkage rod. Impeller, Diffuser. Inlet guide vanes, Scroll.

Where is the main start contactor installed?. In the APU box. In the aft underfloor compartment. In the waste tank area. On the lower RH side of the APU.

What is the purpose of the ignition unit?. To create high voltage electrical pulses for igniter plugs. To control the oil temperature. To measure the APU speed. To monitor the exhaust gas temperature.

The gearbox has a total oil reservoir capacity of 10.5 liters. False. True.

The ignition unit operates on a voltage input of 10 to 30V DC. False. True.

What components are found within the gearbox?. Gravity fill port and pressure fill port. Oil level sight glass. Low oil quantity switch. Electrical chip detector. All above.

How is the gearbox cooled internally?. Oil is supplied to the cooling fan pad and starter motor pad. Air is blown over the gearbox. Water is circulated through the gearbox. The gearbox is cooled by the surrounding air.

Which component is used to detect low oil temperature?. Low oil temperature sensor. Oil heater. Electrical chip detector. Air/oil separator.

What is the purpose of the flow divider?. Divides fuel into primary and secondary flows. Controls the quantity of fuel supplied. Filters the fuel. Monitors fuel temperature.

What is the function of the speed sensors?. Measure the APU speed. Control the fuel flow. Monitor oil temperature. Detect low oil quantity.

What actions occur when the MASTER Switch is set to ON?. ON/R light comes on. APU page displayed on ECAM with amber crosses. ECB starts a power-up test. APU parameters displayed in green on ECAM.

What happens when the START P/B is set to ON?. ON light on the P/B comes on. De-oiling solenoid valve opens if required. Start contactors close and energize the starter motor. APU speed increases.

What initiates a normal APU shutdown?. Setting the APU MASTER SW to OFF. Closing the APU bleed valve. Opening the surge control valve. Decreasing APU speed to 95%.

What happens when APU speed decreases below 95% at the end of the cool down period?. AVAIL legend goes off on the START P/BSW. ECB sends an overspeed signal to shutdown the APU. De-oiling valve is closed. Ecology drain valve is opened.

How many vibration isolators are part of the APU mounting system?. Two. Three. Four. Five.

How is the APU compartment fluid drained overboard?. FWD drain mast installed on the left APU compartment access door. Drain port check valve. Outboard drain tubes. Drain system bypass valve.