Emergency and
Malfunction Procedures
CSP–520N–1
MD 520N (500N) ROTORCRAFT FLIGHT MANUAL
R
Original
3–15
FAA Approved
Conditions:
Failure Producing an Underspeed:
Indications:
N
2
/N
R
decaying.
Possible left yaw.
Possible low rotor warning indication.
Procedures:
F
Lower collective to maintain rotor RPM in the green (410−508) and at
tempt level flight at 60 knots IAS.
F
If power is insufficient for level flight or a power−on decent, make an au
torotational landing.
Conditions:
Power Turbine Governor Surge.
Indications:
N
2
fluctuating: governor not maintaining pre−set speed (99−100%N
2
).
Procedures:
NOTE
:
Turning the start pump ON may allow the engine to operate smoothly. If
operation of the engine returns to normal, it may be possible to fly to a favorable
landing area, however do not disregard the need to land.
F
Beep N
2
to maximum.
F
Control N
2
manually with twistgrip (99% to 100% N
2
).
NOTE
:
This action takes the governor out of the system allowing the pilot manual control
of the N
2
and should eliminate the surge.
