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A&P Airframe Oral Practice Questions > Ice & Rain Control Systems > Flashcards

Flashcards in Ice & Rain Control Systems Deck (22)
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1
Q
  1. Describe the operating principle of inflatable devices boots.
A

Pneumatic air inflates & deflates rubber boots attached to leading edge of wing & stabilizers. Alternating cycle inflate & deflate. Breaks ice away from wing both wings operate at same time

2
Q
  1. Why is it critical to prevent the formation of ice on aircraft wings and control surfaces?
A

Distorts airfoil shape reduces lift increases weight & stress

3
Q
  1. What are two methods of inflating pneumatic deliver boots?
A

Pressurized air from engine driven pump(vacuum) or bleed air from turbine engine compressor

4
Q
  1. What methods are used to attach devices boots to the leading edges of wing and tail surfaces?
A

Bonding to surface with cement, fairing strips and or screws

5
Q
  1. What is the purpose of an air oil separator in a pneumatic driving system?
A

Removing oil & preventing deterioration of deice boots

6
Q
  1. What is used to clean devices boots?
A

Mild soap & water

7
Q
  1. What must be done before you make a cold patch repair to a driver boot?
A

Clean, fought the surface of the boot & patch, glue & attach

8
Q
  1. What component of a pneumatic decider system normally allows suction to be supplied to the boots to hold them down in flight?
A

Solenoid distributor valve

9
Q
  1. Describe the operating principle for thermal anti-icing systems?
A

Hot air passed though the space between skins, and heat is sufficient to prevent formation of ice or melt any next to the skin

10
Q
  1. How can you determine if the heater in a pitot is working?
A

Turn on feel for heat

11
Q
  1. What methods are used to supply heated air for thermal anti-icing system?
A

Bleed air from turbine engine compressor
Engine exhaust heat exchangers
Ram air heated by combustion heater

12
Q
  1. how is overheating prevented in a thermal anti-icing system using bleed air?
A

Thermal switch will close the shut-off valve when temps get to 185F then shut off valve will open when temp drops

13
Q
  1. What is the purpose of the de-ice boot electrical timers?
A

To inflate boots symmetrically and electrically each boot individually preventing overload Electrical system

14
Q
  1. In a thermal anti-icing system, what happens to the air after it has heated the leading edge of the wing?
A

Exhausted to atmosphere at wing tip

15
Q
  1. What problems are associated with electrically heated windshields?
A

Delaminating
Arcing
Scratches
Discoloration

16
Q
  1. What is windshield delimitation?
A

Separation of plies

17
Q
  1. What does arcing usually indicate in an electrically heated windshield?
A

Indicates breakdown in conductive coating

18
Q
  1. Name the three methods of removing train from aircraft wiper systems.
A

Wipers
Pneumatic systems
Chemical repellant

19
Q
  1. What type of power is used to operate windshield wiper systems?
A

Electrical or hydraulic

20
Q
  1. What are common problems encountered with windshield wipers?
A

Aerodynamic forces hits wiper blades reducing the blade pressure on windshield
Fast enough wiper oscillation

21
Q
  1. How does a pneumatic rain removal system work?
A

High pressure air blown across windshields prevents rain from hitting windshield

22
Q
  1. Why should your windshield wipers not be operated when the windshield wipers are dry?
A

Scratch glass