PART 1 - DESCRIPTIVE
(b) (i) An electrically-operated variable-incidence tailplane
is provided. It is hinged at the rear end, while a
projection on the leading edge is connected to an
electrically-operated actuator mounted in the dorsal
fin below the tailplane. After selecting by feel the
required tailplane angle to give zero stick force for
a given flight condition, the elevator is trailing with
no air load imposed on it. The actuator is operated
by one of two electric motors, the main and the
standby. The main motor is controlled by a thumb
switch (62) on top of the stick and the tailplane
operates in the same way as a conventional trimming
tab. The tailplane main motor circuit is protected
by a circuit breaker (4) on the port shelf.
(ii) The standby motor, which is fitted to meet the case
of failure of the main motor, or its electrical supply,
is controlled by a switch (23) under a cover on the
port shelf. When the cover is raised to enable oper-
tion of the standby switch, the main motor circuit
is isolated. The standby motor operates at about
one-third of the rate of the main motor.
(iii)The setting of the tailplane is shown on an
indicator (47) on the port side of the instrument
panel.
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