PART III-HANDLING
(iii) As the aircraft becomes supersonic a slight change
in rudder angle may be felt but this does not affect
directional trim.
(iv) The rudder tab loses effectiveness above 0.9M and
excessive amounts should not be applied owing to
the foot force which will develop as speed is reduced.
(d) Airbrakes
The flaps may be used as airbrakes at any speed or mach
number. Up to about 0.9M there is very little trim
change, but at higher mach numbers a nose-down trim
change occurs; this can be held on the elevator.
(e) Changes of trim
Undercarriage DOWN Negligible fore and aft.
Yaw to starboard.
Flaps/Airbrakes Negligible up to 0.94M
above which nose-down
change occurs.
(f) Flying at reduced airspeed
(i) Fly at 180 to 200 knots, using the flaps as required.
(ii) The hood may he opened if necessary but an
uncomfortable drumming roar is caused when fully
open. The maximum speed for opening the hood is
240 knots.
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A.L.1 (g) Flying in turbulence
Para. 65. The recommended speeds for flight in turbulent conditions are
(g) as follows:-
Page 62 Level flight, or climbing 300 knots/0.79M.
Descending, airbrakes out 270 knots/0.79M.
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66. Practice flying in Manual control
NOTE.-If, after practice flying in Manual, it is not
possible to re-engage Power correctly (indicated
by the red light flashing) select Power off. If
subsequent attempts to re-engage Power are
unavailing the remainder of the flight and the
landing must be carried out in Manual.
(a) Ailerons
(i) Before selecting aileron power OFF in flight, check
that the aileron trim is neutral and speed is below
280 knots or 0.8M. If an aileron has been changed,
or any adjustments made which may affect lateral
trim, check the aircraft in Manual at 200 knots, and
set the aileron trim as required. 62
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