T
RAINING
M
ANUAL
–
L
ANCAIR
IV/IVP
Turbocharger failure will be evidenced by inability of the engine to develop
manifold pressure above ambient pressure. The engine will revert to “normal
aspirated” and can be operated, but will produce less than its rated horsepower.
Readjust mixture as necessary to obtain fuel flow appropriate to manifold
pressure and rpm.
WARNING: if turbocharger failure is a result of a loose,
disconnected or burned through exhaust, then a serious hazard exists.
If turbocharger failure occurs before takeoff, DO NOT fly the aircraft.
If failure occurs in-flight, and the choice is made to continue operating the engine
proceed as follows:
NOTE:
At altitudes above 15,000 feet an
overrich
mixture may result if
the turbocharger fails and the engine may quit operating. If this occurs,
employ the following procedure:
1.
Mixture – IDLE CUTOFF
2.
Throttle – FULL OPEN
3.
Propeller Control – Normal Cruise RPM
4.
Throttle – RETARD TO CRUISE POSITION
5.
Mixture – ADVANCE slowly. When the proper mixture ration is reached,
the engine will start. Continue to adjust the mixture control unit until the
correct fuel flow for the manifold pressure and rpm is obtained.
NOTE:
An interruption in fuel flow to the engine can cause engine power
loss due to turbocharger “run-down”. At high altitude, merely restoring fuel
flow may not cause the engine to restart because the mixture will be
excessively rich. If the engine does not restart, there will be insufficient
mass flow through the exhaust to turn the turbine. This condition may give
indications similar to turbocharger failure. If a power loss is experienced
followed by surging of rpm, fuel flow, and manifold pressure, the following
steps are recommended:
1.
Mixture Control – IDLE CUTOFF
2.
Auxiliary Fuel Pump – LOW
‐
74
–
©
Copyright
2007
LOBO
May
not
be
copied
without
permission.