M2/M3 BFV: FIRE SUPPRESSION SYST - OD1607 - LESSON 2/TASK 2
(2) Perform STE-M1/FVS (VTM only), Test Number 67.
STE-M1/FVS has been properly hooked up, test number 67, battery
voltage (engine off) must be run.
To run test number 67, follow
(a) Dial TEST SELECT (figure 27 on the previous page) to 67.
(b) Press and release the TEST button.
(c) Check the display and note the reading.
1 If the display reads 0 volts, it will be necessary to
perform test number 67 battery voltage diagnostic troubleshooting.
The procedures for this diagnostic troubleshooting will not be
covered in this subcourse, but can be found on page 3-981 in the TM.
2 If the display reads less than 20 volts, remove the
STE-M1/FVS from jack 1A1J14 (DCA 3). This initial test result leads
to pathway one which is described in paragraph 2c below.
3 If the display reads 20 volts or more, it will be
necessary to pursue one of the many other troubleshooting pathways
detailed in the TM. Only two of these pathways will be discussed in
To decide which pathway to follow, perform the two
actions described in paragraphs 2b(3) and 2b(4) below.
(3) Check the Pressure on the Extinguisher Bottles.
possible that the problem is being caused by incorrect pressure in
the squad area fire bottles.
(a) Check the gage pressure readings on both squad area fire
bottles (figure 28 on the following page).
The readings for each
bottle should come within 50 pounds per square inch gage (psig) of
the pressures listed in table 1 on the following page for the ambient
temperature near the bottles at the time the reading is taken.
(b) If the gage pressure is not within 50 psig of the table
1 pressure for each fire bottle, perform the following steps:
1 Remove the STE-M1/FVS (VTM only) from jack 1A1J14 (DCA