Day 3 Progress Check Flashcards
(15 cards)
What issue can arise if shielded flexible leads used in sensing elements are continuously bent or treated roughly?
Breakage of fine wires in the outer braid
What is a key difference between the APU fire protection system and engine fire protection systems?
APU can operate in an unattended mode
What is a potential consequence of interference between a cowl brace and a sensing element?
Wear and shorting of the sensing element
How is the fire extinguishing agent released into the APU compartment in the event of an APU fire during attended mode operation?
By the crew manually pressing a button in the flight deck
Why should no attempt be made to straighten a dent or kink in a sensing element?
Stresses may be built up that could cause tubing failure
What caution is given when replacing cartridge and discharge valves in fire extinguisher systems?
Be careful when replacing and properly assemble the cartridge in the discharge valve
How is the service life of fire extinguisher discharge cartridges determined?
From the manufacturer’s date stamp on the cartridge face.
What is an essential visual check for sensing elements in a continuous-loop system?
Inspecting for cracked or broken sections
What system records the average temperature of the fire detection loops in the Boeing 777?
Aircraft Condition Monitoring Function (AIMS).
What happens if an overheat condition is detected by the fire detection loops?
Master caution lights come on, and a caution aural operates.
What is a potential cause of damage to fire detector sensing elements?
Crushing or squeezing between cowl panels
Why should a removed cartridge not be used in another discharge valve assembly?
The distance the contact point protrudes may vary with each unit
What happens when the APU fire warning is triggered (attended mode)?
The APU automatically stops, and the fire switch is released for manual operation.
What parameter is checked periodically to ensure the proper functioning of fire extinguisher containers?
Pressure within prescribed minimum and maximum limits.
What is the primary function of the fire detection loops in each engine?
Detecting fires and overheat conditions
