MD Helicopters MILVIZ MD530F, Rotorcraft Flight Manual, Page: 91 / 326

MD 500
(Models 369HE/HS/HM
)
ROTORCRAFT FLIGHT MANUAL CSP
−
HE/HS
−
1
Emergency and
Malfunction Procedures
FAA Approved
Revision 6
3
−
23
CYCLIC TRIM FAILURE
Indications:
Inability to reduce cyclic forces with the cyclic trim switch. The failure will
be one of the following types.
WARNING
Control of the helicopter is the primary consideration of a pilot
confronted with any type of trim motor or switch malfunction. The
pilot
−
in
−
command should land the helicopter immediately if the
pilot
’s physical condition, strength, or threshold of fatigue, would
compromise their ability to safely control the helicopter in
continued flight.
Indications: Inoperative trim
Conditions:
The trim motor fails to respond to application of the cyclic trim switch in
one or more directions.
Procedures:
e
Establish a safe flight condition that produces the least cyclic control
force. Normally straight and level at the last trimmed airspeed.
e
Actuate the trim switch thru all positions in an attempt to restore trim
capability and determine the extent of trim failure. If restored, trim to a
near neutral position and land as soon as practical avoiding further trim-
ming.
e
If trim failure is determined to be in all directions, and control of the he-
licopter can be maintained safely, Check/reset TRIM circuit breaker.
e
Land as soon as practical if unable to re establish full cyclic trim control
with the pilot’s cyclic.