PART I-DESCRIPTIVE
26. Undercarriage emergency operation
(a) If electric or hydraulic failure occurs, the undercarriage
may be lowered irrespective of the position of the normal
selector button by pressing the emergency pushbutton (5)
on the port shelf. This releases the air trapped in the
main hydraulic accumulators, which in turn releases the
"up" locks and applies pneumatic pressure to the jack
pistons of the undercarriage units.
(b) If it is required to retract the undercarriage on the
ground. the "up" selector button should be rotated
clockwise and then pressed. It must never he so used
when the aircraft is airborne otherwise damage may be
caused to the wings.
27. Flaps/airbrakes control and position indicator
(a) The split trailing edge flaps. which also act as airbrakes,
are selected electrically and operated hydraulically. They
may be selected down at any speed but the amount to
which they will lower depends upon the air loads. If
speed is increased with the flaps extended, the air loads
will reduce the flap angle.
(b) Control of the flaps is by an inching switch on the
throttle lever in conjunction with a limit setting switch
(22) on the instrument panel. Rearward movement of
the inching switch lowers the flaps, forward movement
raises them. When the inching switch is released it
returns to the central (off) position and flap movement
is arrested.
(c) The limit setting switch may be set to either:-
(1) TAKEOFF AND AIRBRAKES
or (2) LANDING
When set to (1) the limit to which the flaps may be
lowered is 35°. When set to (2) the limit is increased to
50° (fully down). 32
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