Issued with A.L.1
PART 1 - DESCRIPTIVE
(iii)A spring-loaded telescopic strut is incorporated in the
linkage so that full and unrestricted stick movement
is always obtainable The strut telescopes when either
the elevator is moved faster than the rate at which the
tailplane actuator can follow up or when the tailplane
has reached the end of its travel.
(d) Trimming
Trimming is carried out by means of the tab switch on
the control column. In addition to altering the tailplane
incidence, operation of this switch also resets the datum
position of the two micro-switches. During trimming the
elevator is kept in line with the tailplane by the centring
action of the spring feel strut, the switch arm thus follow-
ing the resetting of the micro-switches datum position.
The datum setting cannot be altered by means of the
standby switch.
23. Aileron feel and trim
(a) The air loads are resisted entirely by the hydraulic jack
effort and no load is fed back to the control column. To
provide control feel, a spring is fitted in the control circuit
and gives an artificial stick force which is proportional
only to aileron deflection but not to airspeed. A hand-
wheel (69) on the left-hand side of the control column
provides spring feel adjustment and may be used to trim
the aircraft when in Power. A white line is inscribed on
the handwheel. When the trimmer is neutral the line
points forward and the trimmer engages in a spring-
loaded detent. Movement from this position is through
300° either to the left or to the right thereby adjusting
the zero force position of the stick. This trimmer should
not be used in Manual
(b) A trim tab is fitted on the port aileron. It is only intended
for use in Manual and a guard (28) is placed round the
combined rudder/aileron trim control (27) to prevent
the inadvertent use of the aileron trim when in Power. A trim
indicator (25) is forward of the control.
24. Aileron gear change
(a) On reversion to Manual control, the control column/
aileron gearing is automatically changed so that for the
28A
|