ENSTROM 280FX OPERATOR’S MANUAL 3-11
FAA Approved: Nov 26/13 Rev. 9
Report No. 28-AC-020 Nov 5/13
ROTORS, TRANSMISSIONS, AND DRIVE SYSTEMS
3-10. Rotor RPM Light Illumination (If Equipped)
If the ROTOR RPM warning light illuminates, immediately
lower the collective to increase the RPM or raise the
collective to reduce the RPM as required to return the RPM
to the normal operating range. The only exception to this
requirement is when the light illuminates because the RPM
is low during an autorotational flare immediately prior to
touchdown. After adjusting the collective, continue to
monitor the tachometer and control the RPM by
manipulating the throttle and collective.
3-11. Tail Rotor Malfunctions
Because of the many different malfunctions that can occur,
success in coping with tail rotor malfunctions depends
upon recognition of the condition and use of the proper
emergency procedure. The following is a description of the
three basic types of malfunctions and appropriate
emergency procedures to follow.
1. Complete Loss of Tail Rotor Thrust
This condition can be caused by a failure of the tail rotor
drive system or a failure of the control system which
would allow the blades to assume a neutral pitch
condition.
a. Hovering Flight
When tail rotor thrust is lost in hovering flight the
helicopter will rotate rapidly to the right, even with full
application of left pedal. Proceed as follows:
(1) Roll throttle off to full idle position. Helicopter will
slow down or stop rotation.
(2) As helicopter settles to ground, cushion landing
with up collective (throttle off).
b. During Flight
The helicopter will yaw to the right with full application
of left pedal.
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