ENSTROM 280FX OPERATOR’S MANUAL
3-23
FAA Approved: Nov 26/13
Rev. 9
Report No. 28-AC-020
Nov 5/13
vi.
Directional control is easier to maintain at
airspeeds above 60 knots, but the pilot must plan
to reduce forward speed prior to touchdown.
4. Ground the aircraft at the end of the flight. The aircraft
should be grounded until the problem is resolved by a
maintenance technician.
3-22. Lamiflex Bearing Failure
A lamiflex bearing failure will cause a rough ride. Initially,
this may be only a minor distraction, but in some cases, it
can progress quickly to the point where the bearing
physically comes apart. In this case, control of one blade
will be stiff, the main rotor will be severely out of balance,
and aircraft control may be in jeopardy. The following are
indications of a lamiflex bearing failure as it progresses.
1. A significant worsening of the ride quality from one flight
to the next or from one day to the next for no apparent
reason.
2. The aircraft cannot be trimmed at a hover or runs out of
trim at maximum forward flight speed when previously
there was no problem.
3. The collective suddenly ratchets when moved up and
down when previously it had been smooth or the
collective suddenly feels heavy.
4. The cyclic suddenly wobbles or moves in a circular
motion when previously it had been smooth.
5. The cyclic suddenly starts "chucking," (moving sharply in
a left rear to right forward direction in about a 3/4"
amplitude with a very crisp motion) especially at high
power or high airspeed.
WARNING
This last indication where the cyclic starts sharply
moving may be followed within a few minutes by a
total failure of the bearing.
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