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When a continuous loop wire type fire detection system is tested:
  • A
    only the warning function is tested.
  • B
    the wiring and the warning are tested.
  • C
    the whole wire is heated.
  • D
    a part of the wire is heated.
The integrity of the continuous-loop fire detection system may be tested by actuating a test switch in the flight deck that switches one end of the sensing element loop from its control circuit to a test circuit built into the control unit, which simulates the sensing element resistance change due to fire. If the sensing element loop is unbroken, the resistance detected by the control circuit is that of the simulated fire, and the alarm is activated. The test demonstrates, in addition to the continuity of the sensing element loop, the integrity of the alarm indicator circuit and the proper functioning of the control circuits. 

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