PART 1-DESCRIPTIVE
12. Engine instruments
The following engine instruments are provided:-
R.p.m. indicators .. .. Both cockpits
Jet pipe temperature gauges Front cockpit in all
aircraft.
In rear cockpit (94) on
post-Mod. 1656
aircraft.
Oil pressure gauges (51, 55) Front cockpit only.
MAIN SERVICES
13. Hydraulic system
(a) A hydraulic pump, driven by the starboard engine, pro-
vides pressure for the operation of the following:-
Undercarriage
Flaps
Airbrakes
Windscreen wiper (post Mod. 1862)
(b) The engine-driven pump also charges an accumulator,
which provides a reserve of pressure for operating any of
the services when the engine is not running. The accumu-
lator air inflation point and pressure gauge are on the rear
cockpit floor, on the starboard side of the seat. The correct
air pressure is 800 lb./sq.in.
(c) An air bottle, connected to the reservoir, maintains sea
level atmospheric pressure in the tank at any altitude.
(d) A handpump (85), to starboard of the front cockpit seat,
will operate all the services through the normal pipe lines,
after normal selection. The hand pump cannot be used to
charge the accumulator.
(e) There is no hydraulic pressure gauge, other than the accu-
mulator gauge in the rear cockpit.
14. Pneumatic system
(a) A compressor on the port engine charges an air storage
cylinder in the rear fuselage to a pressure of 450 lb./sq.in.
for the operation of the brakes. A pressure reducing valve16
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