Aircraft Fuel Systems and Fire Protection Flashcards
6 cards from real AME practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Aircraft Fuel Systems and Fire Protection flashcards as text
In an aircraft fire detection system, what does a 'thermal switch' type detector do?
Answer: Closes an electrical circuit when temperature exceeds a preset threshold
A thermal switch is a simple on/off sensor that closes its electrical circuit when the ambient temperature reaches a predetermined value, triggering a fire warning.
A 'continuous-loop' fire detector (such as Kidde or Fenwal) works by:
Answer: Sensing a change in electrical resistance or capacitance along a sensing element due to heat
Continuous-loop systems use a sensing element that changes its electrical properties when heated, allowing fire detection anywhere along the loop's length.
What type of fire extinguishing agent is most commonly used in aircraft engine nacelle fire suppression systems?
Answer: Halon 1301 or approved replacements such as HFC-227ea
Halon 1301 and its approved replacements are standard for aircraft engine fire suppression due to their effectiveness, low toxicity, and minimal residue.
An aircraft fuel vent system primarily prevents:
Answer: Tank structural collapse or rupture from pressure differential during altitude changes
Fuel vent systems equalize pressure between tanks and atmosphere, preventing the tank structure from being subjected to excessive differential pressure as altitude changes.
What is the proper procedure before entering an aircraft fuel tank for internal inspection?
Answer: Purge fuel vapors, verify safety with a gas detector, and follow confined space entry procedures
Fuel tank entry requires complete vapor purging, confirmation with a calibrated gas detector that vapors are below explosive and toxic levels, and full confined space procedures.
What is the purpose of a fuel tank bladder (fuel cell)?
Answer: To provide a flexible, leak-resistant liner inside a structural fuel bay
Fuel bladders are flexible, fuel-resistant bags installed inside structural cavities that provide leak-proof containment while conforming to the shape of the tank bay.