Optional Equipment
Anti–Ice Airframe Fuel FIlter
CSP–520N–1
MD 520N (500N) ROTORCRAFT FLIGHT MANUAL
TM
Revision 2
9–13
FAA Approved
PART IV
NORMAL PROCEDURES
Preflight checks:
NOTE
:
The following checks should be performed as part of the engine compartment
checks listed in the basic preflight checklist in Section IV.
Battery switch − BAT or EXT PWR
Start Pump − ON
Do not open drain valve unless start pump is ON. An unexpected
flameout or power loss may occur if air is allowed to enter the fuel
system.
Drain any residual water in the filter unit through the drain valve
on the
bottom of the filter unit.
NOTE
:
If aircraft has been exposed to freezing temperatures, failure to drain may be due
to ice formation
in the filter element.
Start Pump − OFF
Press red press−to−test button located on the top of filter
unit (Ref.
Figure 9−5); AIR FRAME FILTER light should come on.
Release press−to−test button; AIR FRAME FILTER light
should go out.
Post flight filter draining:
When ambient temperature is expected to go below freezing, any
water in
the filter unit should be drained following completion of
the flight.
WARNING
