Airframe Mechanic Ice and Rain Control Systems Questions and Answers

Question 1

A turbine-powered aircraft's thermal anti-icing system for the wing leading edges is indicating a fault.
The system uses engine bleed air.
Which of the following is the most likely cause for the system to fail to operate correctly?

Accepted Answer

The anti-ice valve has failed to open.

Answer

The pneumatic de-icing boots are operating simultaneously.

Answer

The chemical rain repellent system reservoir is empty.

Answer

The windshield wiper motor has shorted out.

Question 2

When inspecting a pneumatic de-icing boot, which condition would most likely require replacement of the boot rather than a repair?

Accepted Answer

Damage that exposes the underlying stitch-line threads.

Answer

Minor surface cracking due to ozone exposure.

Answer

A small, clean puncture away from the edges.

Answer

Mild abrasions from dust and debris.

Question 3

What is the primary principle of operation for chemical rain repellent systems on an aircraft windshield?

Accepted Answer

It creates a super-slick surface that prevents water from adhering, causing it to bead up and be blown away.

Answer

It heats the windshield to evaporate rain on contact.

Answer

It uses high-velocity air to blast rain from the windshield surface.

Answer

It mixes with rainwater to lower its freezing point.

Question 4

During an operational check of an electric windshield wiper system, the wipers operate correctly at both high and low speeds but fail to return to the 'park' position when the switch is turned off. Which component is most likely malfunctioning?

Accepted Answer

The park switch or associated circuit.

Answer

The wiper motor.

Answer

The wiper arm.

Answer

The main power supply relay.

Question 5

Which of the following is a critical maintenance practice for pneumatic de-icing boots to ensure their longevity and proper function?

Accepted Answer

Regularly cleaning the boots with soap and water and performing visual inspections.

Answer

Keeping the boots inflated when the aircraft is parked to prevent creasing.

Answer

Applying a thin layer of hydraulic fluid to keep the rubber supple.

Answer

Testing the system exclusively in sub-zero temperatures to simulate real-world conditions.

Question 6

An aircraft's wing anti-ice system uses hot air. In most large, turbine-powered aircraft, what is the source of this hot air?

Accepted Answer

Bleed air from the engine's compressor section.

Answer

Exhaust from the auxiliary power unit (APU).

Answer

Electric heating elements embedded in the wing's leading edge.

Answer

Ram air heated by passing over the engine exhaust nacelle.

A turbine-powered aircraft's thermal anti-icing system for the wing leading edges is indicating a fault.The system uses engine bleed air.Which of the following is the most likely cause for the system to fail to operate correctly?

A turbine-powered aircraft's thermal anti-icing system for the wing leading edges is indicating a fault.
The system uses engine bleed air.
Which of the following is the most likely cause for the system to fail to operate correctly?