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TM 9-2350-287-20-2
21-14. CREW AFES OPTICAL FIRE SENSING APPARATUS (OFSA) REPLACEMENT.
This Task Covers:
a. Removal
b. Installation
Initial Setup:
Tools/Test Equipment:
Equipment Conditions:
General mechanic's tool kit (Item 24,
Vehicle parked on level ground (refer to
Appendix I)
TM 9-2350-287-10).
Crew AFES deactivated (para 21-3).
Materials/Parts:
Paper, lens (Item 51, Appendix D)
Lockwasher (2) (Item 196, Appendix H)
a.
REMOVAL
WARNING
· Any automatic fire extinguishing system (AFES) unit in need of maintenance
or repair is more prone to accidental discharge. Accidental discharge could
lead to frostbite or other injury. Small parts or tools become dangerous
projectiles when propelled by Halon discharging at 750 psi (5171 kPa). Do not
strike cylinder bottles with tools and do not drop cylinder bottles. To prevent
accidental discharge, be careful when handling cylinder bottles.
· The engine AFES is designed to provide from two to four hours of fire
protection AFTER vehicle shutdown. Turning off the MASTER switch does
NOT deactivate the AFES. Working on the AFES when the system is active
may cause serious injury to personnel.
CAUTION
· Record position of crew AFES OFSA prior to removal. Failure to do so can
result in failure of OFSA to detect fires when reinstalled.
· Removal procedures for all fire-sensing apparatuses are the same.
1.
Scribe location of OFSA (1) on bracket (7).
2.
Disconnect electrical cable (2) from OFSA (1).
3.
Remove two screws (3), nuts (6), and lockwashers (5), four washers (4), and OFSA (1) from bracket (7). Discard
lockwashers.
Change 1 21-52
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