Engine Fire Protection Systems Flashcards
Can a thermal switch type fire detection system indicate a general overheat condition?
No, this is a spot type fire detection system and it cannot indicate an overheat condition
Can a thermocouple type fire detection system indicate a general overheat condition?
No, this is a rate of temperature rise type of system, and it cannot indicate a general overheat condition
How is a thermocouple type fire detection system checked for operation?
Current is sent through the heater in the thermal test unit. This heats the thermocouple, which produces enough current to close the sensitive relay closes the slave relay and turns on the fire warning light
Does a break in a continuous loop fire detection system keep the system from detecting a fire?
No, the unit will not show a fault when it is tested, but it will still warn of a fire
Does the pressure type continuous element fire detector system detect a general overheat condition, as well as fire?
Yes, a high temperature on a small portion of the sensor or a lower temperature over the entire sensor will cause it to release enough gas to close the diaphragm switch and warn of a fire
What are the two most commonly used fire extinguishing agents used for engine fires?
Halogenated Hydrocarbon, such as Halon 1301, and carbon dioxide
What extinguishing agent is used in the high rate discharge fire extinguishing systems installed in most turbojet engine installations?
Halon 1301
What happens when the pilot pulls the fire-pull T-handle in the cockpit of a jet transport aircraft?
Bottle discharge switch - Uncovered and Armed
Generator field relay - Tripped
Fuel - Shut off to engine
Hydraulic Fluid - Shut off to the pump
Engine Bleed Air - Shut off
Hydraulic Pump low pressure lights - Deactivated
How can a mechanic determine the state of charge of the HRD bottles of fire extinguishing agent?
A pressure gauge on the bottle shows the pressure contents on the bottle
What method is used to discharge an HRD bottle in a turbine engine installation?
An electrically ignited powder charge blows a knife through the seal on the bottle and discharges the contents
Which type of fire detection system operates on the rate of temperature rise?
The thermocouple system
What is indicated if the yellow blow out plug of the fire extinguisher system on the side of an engine nacelle is blown out?
The built in fire extinguishing system has been discharged by normal operation
What is indicated if the red blow out plug of the fire extinguisher system on the side of an engine nacelle is blown out?
The built in fire extinguishing system has been discharged by a high temperature condition
How is a pressure type continuous element fire detector system checked for operation?
Low voltage alternating current is sent through the sheath of the detector element. This heats the element, and it releases enough gas to close the diaphragm switch,
