TM55-2840-251-23
Section III PRINCIPLES OF OPERATION (Continued)
1-11 FUEL SYSTEM (Cont)
Temperature Compensator
The unit is mounted at the air inlet area of the engine
and
comprises
a
needle
valve
actuated
by
a
temperature sensitive disk arrangement. P3 is supplied
to the unit where its flow is affected by the position of
the needle valve, which is, in turn affected by inlet air
temperature. As inlet air temperature changes, varying
modified P3 air pressure (Px) is delivered to the
pneumatic section of the fuel control.
Fuel Manifold Adapter and Nozzle Assembly
The assembly consists of 14 fuel manifold adapter
assemblies, inter-connected by 14 transfer tubes. Each
adapter assembly is fitted with a simplex fuel nozzle
assembly which is positioned on the adapter extension
to give a continuous tangential spray from one nozzle to
the next in the combustion chamber liner. Each fuel
nozzle assembly has a spray nozzle and tip shielded
from the heat by a sheath.
Nf Governor
The governor is driven at a speed proportional to the
power turbine (Nf). Any change in Nf causes the
centrifugal weights to move to open or close a valve
varying Py pressure to the pneumatic section of the fuel
control unit.
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