CSP-HE/HS-1
Optional Equipment
Anti-Ice Airframe Fuel Filter
ROTORCRAFT FLIGHT MANUAL
MD 500
(Models 369HE/HS/HM
)
Revision 6
9-1 1
FAA Approved
9-6. OPERATING INSTRUCTIONS: ANTI-ICE FUEL FILTER
LIST OF MODELS AFFECTED
369HS
Helicopter Serial No. 0101S and Subs
369HE
Helicopter Serial No. 0101E and Subs
NOTE:
This Kit is approved for installation in helicopters equipped with Allison
250−C20 engine only.
PART I
GENERAL
The Anti−Ice Airframe Fuel Filter is designed to filter out ice particles and
other solid contaminants from the fuel prior to entering the engine fuel system.
Installation of the filter will delete the requirement for use of fuel containing
anti−ice additives.
The filter unit is mounted on the aft face of the firewall ahead of the engine
fuel pump inlet and contains a 10 micron, 500 square inch disposable filter ele−
ment.
A pressure sensing switch in the filter body will illuminate a cockpit caution
light and activate the start pump when the fuel differential pressure across the
filter drops to a preset level. If the filter becomes clogged, a by−pass valve in
the filter body will open allowing unfiltered fuel to flow to the engine fuel
pump.
