CSP
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902RFM207E
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1
ROTORCRAFT FLIGHT MANUAL
MD900 (902 Configuration with PW 207E)
Systems Description
Original
7
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34
Reissue 2
the time a fuel valve is in transit between open and closed
positions, the fuel valve
indications will flash. Fuel
valve in transit is defined by both fuel valve input discreets
being open circuit.
The fuel filter impending bypass
status is shown by an inverted ``U'' above each
fuel line indication.
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12. FIRE EXTINGUISHING SYSTEM
The fire extinguishing system provides a means for the pilot to direct a charge
of fire extinguishing agent into the designated fire zone of each engine. There is
no fire extinguishing system for the transmission area.
Refer to Section III, paragraph for fire emergencies.
The fire extinguishing system (Ref. Figure 7-19) contains two individual hermetical
ly sealed pressurized spherical containers (bottles) that are filled with 60 cubic
inches (16.38 CC) of CF
3
BR (Bromotrifluoromethane), also known as Halon 1301,
and pressurized with nitrogen gas to an internal pressure of 700 PSIG (49.22 kg/cm
2
).
Each bottle serves as the primary bottle for its appropriate side engine.
Each bottle is equipped with dual outlet ports, a pressure gauge with electrical
low pressure warning signal to IIDS, filler port and thermal relief valve. The outlets
ports are fitted with electrically discharged explosive squibs. The fire extinguisher
cartridges are armed and ready for firing when the fuel shutoff valves are placed
in the OFF (closed) position. The bottles are discharged when the BOTTLE DIS
CHARGE switch is momentarily placed in the PRI (primary) or ALT (alternate)
position.
The BOTTLE DISCHARGE switch is a momentary type, three position switch lo
cated between the left and right fuel shutoff valves on the cockpit FUEL SYSTEM
panel. Placing a fuel shutoff valve OFF arms the fire extinguishing system for that
engine and selection of PRI discharges its primary bottle. Selection of ALT discharges
the second bottle onto the same engine.
Summary of Contents for MD900 Explorer
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