Optional Equipment
Anti–Ice Airframe Fuel FIlter
CSP–520N–1
MD 520N (500N) ROTORCRAFT FLIGHT MANUAL
TM
Original
9–11
FAA Approved
9–6. OPERATING INSTRUCTIONS: ANTI–ICE AIRFRAME FUEL FILTER
PART I
GENERAL
The MDHI Anti−Ice Airframe Fuel Filter is designed to
strip the fuel of ice
particles
prior to entering the engine fuel system.
Installation of the filter
will delete the requirement for use of fuel containing anti−ice additives.
The anti−ice airframe fuel filter incorporates a filter unit mounted in
series
between the aircraft fuel system and the engine fuel system.
Electrical and
mechanical equipment sense the build−up of ice in the filter
unit and will
automatically illuminate a cockpit caution on the annunciator
panel. The pi#
lot then actuates a switch to activate the aircraft start pump.
When the fil#
ter becomes fully clogged, a by−pass valve contained in the
filter
unit opens
and the fuel by−passes the filter element.
