M2/M3 BFV: FIRE SUPPRESSION SYST - OD1607 - LESSON 2/TASK 2
(e) He listens for the dual valve simulator to emit a tone.
Also, he notes whether the DISCH light on the fire suppression panel
on the driver's instrument panel is ON.
(f) Since the dual valve simulator emits a tone and the DISCH
light is ON, the problem might be in fire sensor MT2.
removes the cotter pin from the DISCHARGE switch S2 guard on the
vehicle electrical distribution box and discards the cotter pin. He
then resets the switch S2.
(g) PFC Elrond checks and sees that the DISCH light is OFF.
(h) Since the DISCHARGE switch is OFF, PFC Elrond moves the
SOURCE SIMULATOR switch to the NEAR position.
(i) Again, PFC Elrond holds the source simulator in front of
fire sensor MT2, being careful to maintain the alignment throughout
(j) He presses the TEST button and notes that the TEST light
is ON. He holds the source simulator in place until the TEST light
turns OFF. Once again the valve simulator emits a tone.
(k) Since the valve simulator emitted a tone during both
tests, PFC Elrond now knows that the MT2 fire sensor is faulty. He
turns OFF the MASTER POWER switch and replaces the flame sensor MT2
using the procedures on page 14-6 of TM 9-2350-252-20-1-5. When the
replacement is complete, PFC Elrond repeats the initial tests on the
fire suppression system and follows pathway one to verify that the
system is now fully operational.
It is important to perform the troubleshooting and testing of the
fire suppression system accurately. A system failure could be fatal
to the crew and severely damaging to the equipment. Therefore, it is
vital that the fire suppression system be operational at all times
and that any malfunction in the system be detected and corrected
before an emergency situation occurs.
Paying careful attention to
the troubleshooting procedures in the TM will assure a fully