PART I-DESCRIPTIVE
slots in the piston rods. The hydraulic pressure acting
on the pawls will cause them to clamp on the rods giving
a false lock, or anchorage, which will slip when moderate
jack loads are imposed. Although the feel on the control
column will be one of apparent Power, the red warning
light will flash and full control column travel will not be
obtainable.
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A.L.4 (b) The pawls may be correctly engaged in their slots by exercising force
Para. 20 on the stick in the direction of restricted travel to overcome the
(b) friction of the pawl clamping on the rod. Easier engagement is
Page 29 obtained with the aileron gear selector set to POWER. (See para.
21 (c).)
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(c) In the air the pawls will normally engage immediately on
selection, but should they fail to do so the instructions
in (b) above should be carried out.
(d) When all pawls are correctly engaged the control column
can be moved freely in all directions and will be felt to
come up against positive stops at the extremes of its
movements. The red light will go out and the green lights
will then come on.
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A.L.4 21. Aileron feel and trim
Para. 21 21(a) (a) On the ailerons, the piston rod is anchored to the aircraft structure
Page 29 the air loads are resisted entirely by the hydraulic jack effect and no
load is fed back to the control column. To provide control feel, a
spring is fixed in the control circuit and gives an artificial stick force
which is proportional to aileron deflection but not to airspeed. A
small handwheel (72), mounted on the control column, is provided
for adjustment to lateral trim when flying in Power.
(b) A trim tab is fixed on the port aileron for use in Manual only. It has
no effect on lateral trim when the ailerons are in Power, but should it
have been offset and Manual reversion takes place, the effect will be
immediate. A trim control switch (6), which operates in the normal
sense, is on the port shelf, aft of the throttle quadrant. The trim
position indicator (17) is adjacent.
(c) When mod. 395 is embodied the control column aileron gearing can
be adjusted by means of a lever on the right of the control column.
Two positions, POWER and MANUAL, can be selected. For the
same stick movement aileron travel with MANUAL selected is
approximately half of that with POWER selected. 29
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