Description (AMM 26-11-00)

 

A- A detector consists of two identical sensing elements attached to a support tube by quick-release mounting clamps. Each sensing element is part of a continuous electrical resistance loop, with resistance varying inversely as a function of temperature.

 

B- As the temperature of the element increases, resistance decreases. When resistance lowers to the first alarm setting, an overheat signal is sent to the control card. When resistance continues to lower to the second setting, a fire alarm signal is sent.

 

(1) The detectors are identical except for length, temperature trip and reset settings of the pressure switches.

 

C- The engine fire detectors are in strut, fan upper, fan lower, and engine core areas.