Emergency and
Malfunction Procedures
CSP–520N–1
MD 520N (500N) ROTORCRAFT FLIGHT MANUAL
R
Original
3–23
FAA Approved
3–12. ABNORMAL VIBRATIONS
Indications:
Sudden, unusual or excessive vibrations occurring during flight.
Conditions:
The onset of unusual or excessive vibrations in the helicopter may be an
indication of problems in the rotor or drive train systems.
Procedures:
F
LAND AS SOON AS POSSIBLE.
F
No further flights should be attempted until the cause of the vibration
has been identified and corrected.
3–13. FUEL SYSTEM MALFUNCTIONS
FUEL FILTER
Indications:
Yellow
FUEL
FILTER
indicator ON.
Conditions:
A predetermined pressure differential across the filter has been reached
and an impending bypass condition exists.
Procedures:
F
Continue flight
If any unusual engine indications or conditions occur, land as soon
as possible.
F
Service the fuel filter prior to the next flight. (Ref. the HMI and the Alli
son Engine Operation and Maintenance Manual).
NOTE
:
Following the completion of the flight in progress, additional flight is prohibited
until the fuel filter has been serviced.
CAUTION
