PART I-DESCRIPTIVE
(iii) If the automatic balancing system, it can be
overridden by setting the retrim switch in the
direction of the white indication to RETRIM as
required. This causes an alternative feed to the
booster pump speed relays to obtained.
5. L.P. fuel cock controls
(a) The engine L.P. cock (27) on the port shelf controls the
flow of fuel from the collector box to the engine-driven
H.P. pumps and throttle. It is moved forward to on
and should never be used to stop the engine except in an
emergency. This cock cannot be set to off without
moving the reheat L.P. cock to off.
(b) The reheat L.P. cock (28) controls the flow of fuel to
the reheat H.P. pump. The cock should normally be ON
but may be set to off without affecting the normal engine
fuel supply (see para. 11).
(c) Both L.P. cocks must be off before pressure refuelling is
possible.
ENGINE CONTROLS
6. Avon 114 engine
(a) General
The engine is a 12-stage axial-flow gas turbine develop-
ing 7,175 lb. static thrust at sea level without reheat and
9,450 lb. with reheat. The main engine systems
include:-
A cartridge starting system. (See para. 7.)
Relighting facilities. (See para. 8.)
A high pressure fuel and reheat system. (See paras.
10-13.)
Variable swirl vanes and air bleed valves. (See
para. 14.)
Self-contained oil system. 12
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