11.8 Flashcards
What happens to an engine fire detection system when a sensor is defective?
The control unit gives a fault alert to the crew or continuous operation by automatic switching.
Example sentence: If a sensor is defective, the control unit will notify the crew of the fault.
Which statement is correct about the cancellation of the central and local fire warning?
The normal fire warning is only triggered when the system is okay.
None
What is the main difference between an engine and an APU fire detection systems?
The APU systems has an additional ground warning and automatic shutdown function.
None
Which physical effect is used in semiconductor type loop to detect a fire?
The material in the tube decreases its resistance with increasing temp.
None
Which statement is correct when a semiconductor or gas pressure loop contacts the structure?
After some time the loop is damaged. Gas pressure loops detect fault and semiconductor detect alarm condition.
None
How is smoke detected by the optical smoke detectors?
Smoke reflects the light from the beacon lamp, and illuminates the photo resistor, and decreases its resistance.
None
How is smoke detected by ionisation type smoke detector?
The mass of the different gas molecules is analyised.
None
Why are ionisation type smoke detector not allowed to be opened?
Because it contains potentially harmful radioactive material.
None
Which of the following statements is true for a fire extinguisher?
They are filled with halon 1301 which is pressurised by nitrogen.
None
Which statement is true for a discharge head of a fire extinguisher bottle?
It opens when the bottle explosive cartridge is fired by a current.
None
What does the expiry date on the label of a fire extinguisher system bottle mean?
After the expiry date discharge cartridge must be replaced.
None
What does the squid test push button test?
It tests the wire inside the cartridge and the firing circuit are okay.
Example sentence: The squid test push button is used to ensure the wire and firing circuit are functioning properly.
What happens when a fire discharge switch or button is pressed?
The bottle discharges because the firing circuit is directly connected to the hot battery bus.
No additional information.
Which statement is correct about water and halon fire extinguishers?
Water extinguisher are the best type for type A fires isolated from electrical power.
No additional information.
What are the three parts of a periodic check on a portable fire extinguisher?
Overhaul date check, check for previous use, and visual check.
No additional information.
