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 primary purpose of a pneumatic deicing boot on an aircraft?
Answer: To inflate and break off ice that has accumulated on the leading edge
Pneumatic deicing boots inflate cyclically to fracture and shed ice that has already formed on the leading edge.
Which FAR part establishes the certification standards for ice protection systems on transport category aircraft?
Answer: FAR Part 25
FAR Part 25 covers airworthiness standards for transport category airplanes, including ice protection requirements.
On a pneumatic deicing system, what controls the inflation sequence of the boots?
Answer: A timer or distributor valve
A timer or distributor valve sequences the inflation of individual boot sections in a predetermined order.
What type of fluid is used in a TKS (weeping wing) ice protection system?
Answer: Ethylene glycol-based fluid
TKS systems use an ethylene glycol-based fluid (MEG or similar) that lowers the freezing point of water on the surface.
An ice detector that uses a vibrating probe operates on which principle?
Answer: Changes in the resonant frequency of the probe as ice accretes
Vibrating-probe ice detectors sense ice accumulation by detecting the change in resonant frequency caused by added mass on the probe.
When inspecting a pneumatic deicing boot, a mechanic finds a small blister between the boot and the leading edge skin. What is the correct action?
Answer: Replace the boot if delamination exceeds allowable limits per the SRM
Blister size limits and acceptable repairs are defined in the Structural Repair Manual; delamination beyond limits requires boot replacement.
What is the function of the check valve in a pneumatic deicing boot system?
Answer: To prevent backflow of air that could collapse an inflated boot prematurely
Check valves prevent reverse airflow through the system, ensuring each boot section holds pressure during its inflation cycle.