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PART I-DESCRIPTIVE
(iii) An AIR EXTRACT magnetic indicator (49) which
shows white if a breakdown occurs in the air
extraction system for the space between the jet
pipe outer casing and the fuselage skin in zone 4
(see para. 13). It also shows white momentarily
when selecting undercarriage up or down.
12. Operation of the reheat system. (See para. 54.)
(a) Reheat is selected by moving the throttle into the reheat
gate with the shut-off switch at NORMAL, and the
reheat L.P. cock open. Light up should occur within 2-5
seconds of selection, depending on altitude. During this
period and for 2-3 seconds after light-up the jet-pipe
"eyelids" position indicator will show white.
(b) The throttle position at which the throttle-operated
reheat switch is closed is always the same. but minimum
r.p.m. obtainable, once reheat has been engaged, vary
from about 7,300 at sea level to 7,800 at 45,000 ft.
R.p.m. with reheat in use may be varied by throttle
movement but r.p.m. should not be allowed to fall below
7,600.
(c) Reheat is cancelled by pulling the throttle out of the
reheat gate and throttling back. At the lower altitudes
to avoid falling below 7,600 r.p.m. it will be necessary
to cancel reheat by pulling the throttle out of the gate
and then operating the shut-off switch.
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A.L.2 (d) Reheat can be cancelled by operating the shutoff switch with-
12 (c).13 out pulling the throttle out of the gate. but should the switch be
Page 17 set back to NORMAL with throttle still in the gate. the reheat
will relight.
(e) A reheat top-temperature limiter automatically cancels reheat
and closes the eyelids if the J.P.T. exceeds 700°C. In this event
the nozzle position indictor shows white until the throttle is
pulled out of the gate. When mod. 739 is embodied a NORMAL/
OVERRIDE switch (36) is fitted to the port side of the instrument
panel. When the switch is set to NORMAL the limiter is in
operation; when set to OVERRIDE the limiter is inoperative.
This position should be selected at take-off.
13. Fire-extinguishers and fuselage ventilation
(a) Two independent fire-extinguisher systems are fitted and
may be operated by combined warning light/press17
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