PART 1-DESCRIPTIVE
brakes, hood seal and hood raising mechanism. A
standard triple pressure gauge (16) is on the left-hand
side of the upper panel.
16. Hydraulic system
(a) An engine-driven pump supplies pressure in the hydraulic
system for the operation of the:-
Undercarriage
Flaps and airbrakes
Hood jettisoning
Windscreen wiper
(b) (i) Pre-mod. 3687 an accumulator is fitted in the system
to ensure rapid operation of the services. If the
engine-driven pump fails, the accumulator may pro-
vide enough reserve of pressure to lower the under-
carriage once, in addition sufficient pressure may also
remain to operate the flaps. The pilot must be
prepared to assist these selections as outlined in
para. 24.
(ii) Post-mod. 3627, two additional accumulators are
provided for the emergency operation of the under-
carriage, flaps and hood jettison systems. The accu-
mulators are isolated from these systems by a
selector valve controlled by a yellow-and-black
painted EMERGENCY HYDRAULICS lever be-
tween the pilots' seats. When the lever is pulled
aft in the direction of the arrow the accumulators
are in circuit. The airbrakes cannot be operated
by the accumulators, the windscreen wiper can be
operated, but its use thereby is not recommended.
(c) A handpump, located between the seats at shoulder
height, is provided for ground test and for emergency
operation of the undercarriage, flaps and hood jettison
systems. It may also be used to charge the mod. 3627
accumulators. The airbrakes cannot be operated in the
air by the handpump. The maximum effect is produced
only when the handpump is operated at full stroke.
When not in use the handpump should be left in the up
position.
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