TM 55-1520-240-T
12-3.3 FIRE EXTINGUISHING SYSTEM VISUAL CHECK
12-3.3
INITIAL SETUP
References:
TM 55-1520-240-23
Applicable Configurations:
All
Equipment Condition:
TM 55-1520-240-23:
Tools:
Battery Disconnected
Aircraft Mechanic's Tool Kit,
Electrical Power Off
NSN 5180-00-323-4692
Hydraulic Power Off
Materials:
None
Personnel Required:
Medium Helicopter Repairer
TASK
RESULT
1.
Check FIRE EXT AGENT switch (1).
If switch (1) is loose or damaged, tighten or replace it as
required.
2.
Check NO. 1 ENGINE and NO. 2 ENGINE fire handles
If either fire handle (2) is loose or damaged, tighten or
(2).
replace it as required.
3.
Check fire extinguisher (3).
If either fire extinguisher (3) is loose, tighten it. If wiring to
cartridges (4) is damaged, repair or replace it as required.
4.
Read gage (5) on each fire extinguisher (3).
If either gage (5) pressure reading is below following
limits, replace fire bottle.
Temperature
Pressure
-40°C (-40
F)
292 - 370 psi
-29°C (-40°F)
320 - 400 psi
-18°C (0°F)
355- 437 psi
-7°C (19°F)
396 - 486 psi
4°C (39
F)
449 - 540 psi
15°C (59°F)
518- 618 psi
27°C (81 °F)
593 - 702 psi
30°C (100
F)
691 - 784 psi
52°C (126°F)
785- 902 psi
FOLLOW-ON MAINTENANCE:
None
END OF TASK
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