PART I-DESCRIPTIVE
8. Relighting pushbutton
The igniter plugs are used to relight the engine in flight
by pressing the relight button on the inboard side the
H.P. cock with the ignition switch on.
9. Throttle control
(a) The throttle lever (21) moves in a quadrant which
incorporates a reheat gate forward of the normal full
throttle position.
(b) Incorporated in the throttle handle is the GGS manual
ranging twist-grip, together with the flaps inching switch
and press-to-transmit button.
10. Reheat system
(a) The purpose of the system is to augment engine thrust
by burning injected fuel in the jet-pipe. The temperature
of the exhaust gases and hence their efflux speed from the
jet-pipe nozzle is thereby increased, giving added thrust.
(b) When reheat is selected (see para. 12), the reheat igniter
is energized for about 30 seconds and simultaneously
causes solenoids to open two cocks. One cock permits
fuel from the engine H.P. system to flow to a reheat
pilot burner where it is lit by the igniter: the other cock
allows air from the engine compressor to start up the
reheat pump. As fuel pressure from the reheat pump
builds up a pressure switch energizes a solenoid to open
the reheat H.P. fuel cock allowing fuel to pass to the
main reheat burner where it is ignited by the pilot burner
flame.
(c) The pressure switch also energizes a second solenoid on
the jet-pipe nozzle control valve. Air from the com-
pressor then operates four ram jacks which open the jet
pipe "eyelids" thereby increasing the final nozzle area.
(d) After about 30 seconds a time switch operates to cut off
current to the reheat igniter. 14
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