TM 55-1510-220-10
Figure 2-11. P76A-41 Engine (Sheet 2 of 2)
operates continuously and automatically to heat the fuel
sufficiently to prevent ice from collecting in the fuel
control unit. Each fuel control unit is protected against
ice. Fuel control heat is automatically turned on for all
engine operations.
2-22. ENGINE FUEL CONTROL SYSTEM.
a.
Description. The basic engine fuel system
consists of an engine driven fuel pump, a fuel control unit,
a fuel flow divider, a dual fuel manifold and fourteen fuel
nozzles.
b.
Fuel Control Unit. One fuel control unit is
mounted on the accessory case of each engine. This unit
is a hydro-mechanical metering device which determines
the proper fuel schedule for the engine to produce the
amount of power requested by the relative position of its
power lever. The control of developed engine power is
accomplished by adjusting the engine compressor turbine
(N1) speed. N1 speed is controlled by varying the
amount of fuel injected into the combustion chamber
through
the
fuel
nozzles.
Engine
shutdown
is
accomplished by moving the appropriate condition lever
to the full aft FUEL CUTOFF position, which shuts off the
fuel supply.
Change 2 2-23
