15.20 Flashcards
Where is the upper and lower wires connected to in a semiconductor loop
Upper: control unit
Lower: ground
What liquid is used in a fire extinguisher bottle
Halon 1301
How long does the local warning stay on for
As long as the fire detection loop detects a fire
What is the simplest type of sensor
Bi-metallic switch
What does a missing yellow disc indicate
That the bottle has been discharged
What are the two types of continuous loop systems
The semiconductor loop
The pneumatic pressure loop
What is the resistance for short loop
10 M ohms
How is the hot battery bus powered
By the batteries
What is the weight of the fire bottle in engines
10Kg
What material is used in in a semiconductor loop that has a stainless steel tube
Semiconductor ceramic material with a wire in the centre
What is the weight of the fire bottle in cargo compartment
20KG
What is the resistance for long loop
1Mohms
When will the frangible disc break
When pressure increases to 1700psi
When will the fire alarm be triggered
When resistance decreases below 500 ohms
What is the squib test
Test carried out to test the fire bottles
What components does a fire detection system have
A sensor
A control Unit
Warning Panels
How many discharge heads does a fire bottle usually have
One
Where is the APU fire extinguisher located
In the stabiliser compartment in front of the APU fire wall
How much does the fire bottle weigh in the APU
5Kg
Who is the manufacturer for the two internal wire loop type sensor
Kidde
How are the resistors connected in a sensor
Parallel
What must you do if the fire warning is still on after 30 seconds
Discharge the second bottle
What is Halon 1301 pressurised to and at what temperature
Pressurised to 600psi at 20 degrees C
