PART I-DESCRIPTIVE
provides additional pressure for the wheel brakes. Two
accumulators in the system store energy, one for emer-
gency operation of the air brakes , and the other for
emergency lowering of the nosewheel.
(iii)Power controls normal and stand-by hydraulic system
(a) This system supplies power for operation of the
ailerons and the tailplane. The system operates
through three cylinders which are connected to the
hydraulic jacks at the corresponding control sur-
faces. If the normal system fails, transfer to the
stand-by system is effected automatically and is
indicated by a warning light (16) on the instrument
panel coming on. The changeover may also be
effected manually by a switch (64) on the left-hand
aft console. Changeover from one system to the
other is only possible if operating pressure is
available in the other system.
(b) If the generator is not working in flight, the stand-by
system is powered direct from the aircraft battery
irrespective of the position of the battery switch;
when on the ground the battery switch must be at
BATTERY before the system is operative, unless
the generator is running or an external power supply
is connected. The stand-by system is automatically
engaged and the light (16) comes on when external
power is applied for starting the engine. The normal
system must be actuated after the engine has started,
by holding the switch (64) to RESET until the
hydraulic gauge reads 1,000 lb./sq. in., and then
letting the switch return to NORMAL. The light
(16) should then go out.
(c) If the normal system fails in flight, the stand-by
system should automatically engage and the light
come on. If it does not engage automatically it
should be engaged, by putting the switch (64) to
ALTERNATE. If it still does not engage, an
emergency override handle (77) which is fitted in the
inboard face of the right forward console should be
pulled fully out, in order to effect the changeover
mechanically.
NOTE.--The circuit-breaker protecting the electrically-
driven pump which powers the stand-by system
is behind the ground-fire-access panel just for-
ward of the port air brake-well which is labelled
17
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