AME Aircraft Fuel Systems and Fire Protection 2

Question 1

In an aircraft fire detection system, what does a 'thermal switch' type detector do?

Accepted Answer

Closes an electrical circuit when temperature exceeds a preset threshold

Answer

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.

Question 2

A 'continuous-loop' fire detector (such as Kidde or Fenwal) works by:

Accepted Answer

Sensing a change in electrical resistance or capacitance along a sensing element due to heat

Answer

Continuous-loop systems use a sensing element that changes its electrical properties when heated, allowing fire detection anywhere along the loop's length.

Question 3

What type of fire extinguishing agent is most commonly used in aircraft engine nacelle fire suppression systems?

Accepted Answer

Halon 1301 or approved replacements such as HFC-227ea

Answer

Halon 1301 and its approved replacements are standard for aircraft engine fire suppression due to their effectiveness, low toxicity, and minimal residue.

Question 4

An aircraft fuel vent system primarily prevents:

Accepted Answer

Tank structural collapse or rupture from pressure differential during altitude changes

Answer

Fuel vent systems equalize pressure between tanks and atmosphere, preventing the tank structure from being subjected to excessive differential pressure as altitude changes.

Question 5

What is the proper procedure before entering an aircraft fuel tank for internal inspection?

Accepted Answer

Purge fuel vapors, verify safety with a gas detector, and follow confined space entry procedures

Answer

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.

AME - Aircraft Maintenance Engineer Practice Test

AME - Aircraft Maintenance Engineer Practice Test

AME Aircraft Fuel Systems and Fire Protection 2