ENSTROM 280FX OPERATOR’S MANUAL
7-5
Rev.
10
Report No. 28-AC-020
Apr 15/15
circuit breaker panel. For starting and normal operation,
place the switch in the “both” position.
d. Ignition Circuit Breaker. This circuit breaker closes the
circuit to the starter button on the collective control.
e. Starter Button. The starter button is located on the end
of the pilot collective control (and the copilot collective
control, if equipped with dual start). Push to engage.
f. Master Switch. The master switch is located on the left
side of the switch circuit breaker panel. It is a single-
throw, two-position switch.
3. Turbocharger
The turbocharger unit has only one moving part: a rotating
shaft with a turbine wheel on one end and a compressor
impeller on the other. Both the turbine wheel and the
compressor impeller are precision balanced and contained
in their own housings. The turbine wheel, driven by exhaust
gas energy, drives the impeller that compresses intake air
to a density greater than sea level and delivers it to the
engine intake. This increased mass of air allows the engine
to “breathe” with the same volumetric efficiency that it does
at low altitudes. The engine can produce 225 HP at all
altitudes up to 12,000 ft density altitude.
4. Wastegate
The wastegate is a valve that controls the amount of
exhaust gases directed to the turbocharger. The valve is
located on the exhaust manifold just upstream of the
turbine inlet. The valve is controlled by mechanical linkage
connected to the fuel servo throttle valve.
7-5. Turbine Inlet Temperature System
The turbine inlet temperature (TIT) is used for fuel mixture
leaning in cruising flight. TIT is obtained from a temperature
probe located on the exhaust stack just before the inlet to the
turbocharger. This allows an actual
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