AUX

Question 1

1. The purpose of the APU is to _________.

Answer 1

Provide a pneumatic air source, and an electrical power source.

Question 2

What is the primary function of the ESU?

Answer 2

Automatic starting and continuous operational monitoring.

Question 3

What is the minimum accumulator pressure, prior to beginning the APU start sequence?

Answer 3

2,800 psi

Question 4

What should be done if during ground operation at high ambient temperatures the APU OIL HOT caution appears or the OIL HOT capsule illuminates?

Answer 4

The APU should be shut down immediately to prevent damage, and after a 30-minute cooling period, the oil level should be checked.

Question 5

What function does the thermal protective switch provide?

Answer 5

Activates the shut off switch between 90° and 96° C to prevent cabin overheating.

Question 6

What are the three possible heated air sources for the aircraft on the ground?

Answer 6

Bleed air from the engines, APU, or external source.

Question 7

The Fire Detection System provides fire warning in the cockpit in case of what?

Answer 7

Fire in either engine compartment or the APU compartment.

Question 8

Describe the fire detectors?

Answer 8

The fire detectors are solid state photoconductive cells that react to infrared radiation.

Question 9

Upon impact of a crash of 10 g or more, the omni directional inertia switch automatically fires both cartridges attached to the containers releasing fire extinguishing agent into what?

Answer 9

Both engine compartments