PART 1II-HANDLING
WARNING.-Derwent 9 engines. When charged, the
capacitor in the high energy ignition unit
possess lethal voltage. The unit must be
isolated and at least one minute allowed to
elapse, before the ground crew make
adjustments in the vicinity of the unit.
(g) Simultaneous starting of both engines is not permissible
but, when for operational purposes it is necessary to start
the engines with minimum delay, the starter pushbuitton
of the second engine may be prersssed not less than 5 seconds
after the starter pushbutton for the first engine has been
released. The starting sequence then becomes:-
(i) Starboard engine starter button-press and relaease.
(ii) When the starboardc engine r.p.m. reach 800-1,000,
turn the H.P. cock half on.
(iii) Port engine starter button-press and release.
(iv) When the port engine r.p.m. reach 800-1,000, turn
the H.P. cock half on.
(v) Ease both H.P. cocks to the fully-on position.
(h) If, while starting the starboard engine, severe hammering
is heard, it is due to air in the hydraulic system, and
should disappear when one of the hydraulic services is
operated.
(j) When both engines are running at idling r.p.m. and not
before, have the ground/flight switch placed to FLIGHT
and the ground starter battery disconnected.
52. Checks after starting
Engine fire-warning lights Out
Idling r.p.m. 3,300 to 3,700 r.p.m.
J.p.t. Max. 500°C.
Oil pressure 5 lb./sq.in. (min)
Pneumatic pressure 200 lb./sq.in. (minimum for
taxying) and increasing
(450 lb./sq.in. max)
Pressure at each wheel
120 lb./sq.in.
V.H.F. Channel and set-selected41
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