MD Helicopters MD Explorer - Maintenance Practices; Cabin-Mounted Emergency Fire Extinguishers; Description and Operation; Emergency Fire Extinguisher

CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 201
Revision 35
26-20-10
EMERGENCY FIRE EXTINGUISHER
MAINTENANCE PRACTICES
1. Description and Operation
A. Emergency Fire Extinguisher
The rotorcraft is equipped with a hand-held
2.5 lb (1.13 kg) fire extinguisher that mounts
on the aft side of the center console. The
extinguisher uses a liquified gas which
discharges Halon 1211 extinguishing agent as
a vapor at a high-nozzle velocity. A pressure
gage on the extinguisher indicates charge,
normal, and overcharge pressures. The green
area indicates normal operating range of 125
psi (862 kPa). The red area indicates
CHARGE or OVERCHARGE.
B. Cabin−Mounted Emergency Fire
Extinguishers
The rotorcraft can have one or two optional
disposable hand-held fire extinguisher(s) that
can be mounted on either the left- or right-
hand side of the cabin. This extinguisher has
no gauge, and discharges 14 oz (0.40 kg) of a
unique blend of Halon 1211-1301 extinguish
ing agent (ref. Section 01-00-00).
2. Fault Isolation
A. Fire Extinguishers
The troubleshooting procedures in Table 201
are a summary of emergency fire extinguisher
faults, probable causes, and corrective actions.
Table 201. Emergency Fire Extinguisher Troubleshooting
Fault Probable Cause Corrective Action Ref. Section
Fire extinguisher displays
excessive damage,
corrosion or pitting.
Prolonged exposure to
harsh elements.
Replace bottle. 26−20−10
Gross weight is below
manufacturer recommen-
dations.
Excessive leakage around
the valve and “O” rings.
Replace bottle. 26−20−10
Previously discharged. Replace 14 oz (0.40 kg)
bottle.
26−20−10
Service 2.5 lb (1.13 kg)
fire extinguisher (ref.
manufacturers instruc-
tions).
26−20−10
Pressure gauge (2.5 lb
(1.13 kg)) indicates red.
Overcharged or
discharged.
Service 2.5 lb (1.13 kg)
fire extinguisher (ref.
manufacturers instruc-
tions).
26−20−10
Mounting brackets
damaged or release clasp
damaged and works
incorrectly.
Heavy cargo or equipment
making contact.
Repair or replace as
required.
26−20−10