Ice and Rain Control Systems Flashcards
7 cards from real Airframe Mechanic Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Ice and Rain Control Systems flashcards as text
What is the purpose of the 'hold-down' (suction) function in a pneumatic deicing boot system?
Answer: To keep the boot deflated and conformed to the leading edge when not inflating
Suction is applied to the boot between inflation cycles to hold it tightly against the leading edge skin, minimizing aerodynamic drag and preventing flutter.
An aircraft's windshield wiper system fails to return to the park position after shutdown. The MOST likely cause is a fault in which component?
Answer: The park switch or wiper motor parking circuit
The wiper motor parking circuit, controlled by an internal or external park switch, is responsible for driving the wiper to its park position at shutdown.
What is the purpose of the 'ice bridging' concern associated with deicing boots?
Answer: Ice that forms an arch over an inflated boot so it cannot be shed when deflated
If boots are activated before sufficient ice accumulates, the ice can arch (bridge) over the inflating tube and remain adhered to the wing when the boot deflates.
Which system component monitors for electrical faults in a windshield heating system and protects against overtemperature?
Answer: An automatic temperature controller with overtemperature cutout
Windshield heating controllers monitor glass temperature using embedded sensors and automatically shut off power if overtemperature is detected to prevent delamination.
Frost on an aircraft wing before takeoff is hazardous primarily because it:
Answer: Disrupts the smooth airflow over the wing and reduces lift
Even a thin layer of frost roughens the wing surface enough to disrupt the boundary layer airflow, reducing lift and increasing stall speed.
During a TKS weeping wing system inspection, the mechanic notices some porous titanium panel holes are clogged. What is the correct maintenance action?
Answer: Replace the clogged porous panel per the AMM
Clogged TKS panels must be replaced rather than drilled or otherwise modified, as pore size and distribution are precisely controlled for correct fluid flow.
What is the significance of Appendix C versus Appendix O in FAR Part 25 for ice protection system certification?
Answer: Appendix C defines the traditional icing envelope; Appendix O defines the SLD icing envelope
Appendix C defines the classical continuous maximum and intermittent maximum icing envelopes, while Appendix O (added later) defines the SLD (freezing rain and freezing drizzle) icing envelope.