A.P. 4348R.-P.N.
Pilots's Notes
A.L.1
Page 69
PART IV
EMERGENCY
HANDLING
76. Engine failure and relighting in flight
(a) Sudden drop in engine speed
NOTE:-This procedure only applies if the H.P. pump isolating
valve and switch are fitted (by engine mod. action).
(i) If a sudden inexplicable drop in engine speed occurs, which
cannot be identified as engine surge (see para. 53(c)) proceed
as follows:-
Above 20,000 ft. Close the throttle fully and descend:
check engine response to throttle movement during the
descent.
Below 20,000 ft. If the engine fails to respond to normal
thrott1e movement, close the throttle fully and set the H.P.
pump isolating switch ON. If the engine still fails to respond
to throttle movement, leave the switch at ON and carry out
relight action. Once the switch has been set ON it must be
left there for the remainder of the flight; with it thus set the
A.C.U. is ineffective and all throttle movement must be made
with care.
(b) Flame-out
(i) If a flame-out occurs when the engine is at or above cruising
power, it will be indicated by the r.p.m. decreasing at approxi-
mate1y 1,000 r.p.m. per second initially. A relight may he
attempted immediately, while r.p.m. are decreasing, by
pressing the relight button with the H.P. cock open and the
throttle at its set position. A successful relight w111 he indi-
cated by the r.p.m. stabilising and then commencing to rise;
the likelihood of a successful relight is increased if the height
and airspeed are below the permitted maxima for relighting.
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A.L.1 (ii) If no relight occurs within 10 seconds, release the relight button
Para. 76 and proceed as follows:-
(b) (ii) H.P. cock OFF.
Page 89 Throttle Closed.
Engine L.P. cock Leave on.
Reheat L.P. cock Closed.
All non-essential electrics OFF (see para. 89 (b)).
If below 35,000 ft. Relight at once.
If above 35,000 ft. Switch off the booster pumps, de-
scend to 35,000 ft. and carry
out the relight drill.
(iii) If above 35,000 ft. the decision either to descend quickly or
glide at 200 knots will depend on the prevailing circumstances
e.g. weather conditions, distance to travel, etc. The following
should be borne in mind:
1. The likelihood of obtaining a relight increases with decrease
in altitude. 69
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