EXAMEN ATA 49 APU

When the ECB de-energizes back up start contactor. N= 45+5s. N= 50+5s. N= 55+5s.

When is activated the surge control and IGV control loops?. N= 90 %. N= 95 %. N= 100 %.

What happens in the cool down state procedure if you where using the APU air before shut down the APU?. The engine goes into a 100 s cool down cycles, running the APU at a low stabilized temperature before normal shutdown. The engine goes into a 120 s cool down cycles, running the APU at a low stabilized temperature before normal shutdown. The engine shutdown immediately.

What happens in the cool down state procedure when you shut down the APU? (Not using the functions of the APU). The engine goes into a 15 s cool down cycles, running the APU at a low stabilized temperature before normal shutdown. The engine goes into a 35 s cool down cycles, running the APU at a low stabilized temperature before normal shutdown. The engine shutdown immediately.

What happens if an abnormal parameter is detected during the operation of the APU?. Initiates an immediate shutdown. Initiates a 60 s shutdown Procedure. Initiates a 120 s shutdown Procedure.

How many reasons cause the abnormal shuts down procedure. 6. 10. 16.

What is the purpose of the APU management system?. Management and control keeps the APU rotation speed constant to obtain a constant DC generator frequency output, protects the power unit from over temperature, avoids load compressor surge, controls safe APU start and eases the APU. Management and control keeps the APU rotation speed constant to obtain a constant AC generator frequency output, protects the power unit from over temperature, avoids load compressor surge, controls safe APU start and eases the APU.

How many sequences the APU management system controls?. 5. 6. 4.

In which sequence the gearbox de-oiling valve, the ignition unit and the main start contactor are activated by the ECB?. Starting state. steady state. cool down state.

When is energize the 3 way solenoid valve?. N=2 %. N=3 %. N=4 %.

When is energize fuel servo valve inside the FCU for metering fuel?. N=2 %. N=3 %. N=4 %.

When the ECB de-energizes the ignition unit, the gearbox de-oiling valve and the main start contactor. N= 45 %. N= 50 %. N= 55 %.

The APU fuel Low Pressure Valve opens when: The master switch is set to ON. The start pushbutton is pressed. The batteries are set to ON.

The APU start sequence begins when: The APU Master switch. The APU START pushbutton. The APU BAT pushbutton.

Each time when an normal shutdown occurs. The ECB maintain the apu running until cool down period has finished. The amber fault light illuminates on the APU master switch, alarm level Two and ECAM message appears. The APU is shutdown immediately but the messages and local light are not showing.

A manual override device (mechanism) used by MEL, is provided for: The air intake flap. The relay box. The Inlet Guide Vane.

APU oil cooling function is achieved by: An APU gearbox driven fan. An air compartment cooling valve. An exhaust eductor system using APU gas stream.

The purpose of the 3-way solenoid valve is: To Measure the amount of fuel that goes to the fuel nozzles. To shut or to provide fuel to the flow divider (fuel cut off). Regulates the fuel pressure to the nozzles.

What happened if the main oil filter becomes clogged?. The protective shutdown is initiated by ECB. The APU must be shut down as soon as possible. The APU maintain running until the filter becomes normal.

The lubrication module provides lubricating oil to: The generator and the gearbox. The gearbox only. The generator, the gearbox and the main shaft bearing.

The function of the IGV's are: To Controls the amount of air that goes into the power section. To Controls the amount of air that goes into the load compressor. Neither of above.

(APIC) at 55% the ECB will cut the electrical supply to. The ignition system and bleed air valve. Fuel low press valve and APU fuel pump. The starter, DE- oil solenoid valve and ignition system.