PART I-DESCRIPTIVE
ALTERNATE HYDRAULIC FLIGHT CON-
TROL BY-PASS VALVE. After plugging in
an external power supply, check that this circuit-
breaker is made.
(iv) Hydraulic pressure gauges
In addition to the hydraulic pressure gauge (12) on the
instrument panel registering the system pressures, there
are five accumulator pressure gauges, one in the nose-
wheel-well for the nosewheel accumulator, one in the
starboard wheel-well for the air brakes accumulator, one
in the port wheel-well for the normal power controls
hydraulic system and two in the starboard air brake-well
for the stand-by system. The air brake and nosewheel
accumulator gauges should register 1,200-1,300 lb./sq. in.
(min) when the engine is not running, and the other
three gauges should all register a minimum of 600-700
lb./sq. in.
AIRCRAFT CONTROLS
18. Flying controls
(i) The ailerons and tailplane are completely hydraulically
operated, and artificial feel is built into the system to
provide stick forces. The movement of the tailplane and
the elevators is combined, this type of control being
known as a "flying tail".
(ii)The rudder is cable-operated and rudder pedal adjust-
ment (29) is conventional. Indicators (30) on the out-
board side of each pedal show when the pedals are
adjusted evenly.
19. Trimming controls and indicator
(i) The ailerons and tailplane are trimmed from the cockpit
by changing the "no-load" position of the control
column. Trimming is normally effected by movement of
a thumb switch (76) on the control column grip. The
switch is spring-loaded to the central position and is
moved fore and aft for the longitudinal trim and side-
ways for lateral trim. When the switch is released, it
should return to neutral and the aircraft will remain
trimmed in the selected position. Experience has shown
this switch has a tendency to remain in the actuated
position so it should always be returned to the neutral
position by applying thumb pressure in the opposite
direction after use.
(ii)Two four-position stand-by trimming switches are
mounted on the left console and control separate circuits
18
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