ENGINE SYSTEM EMERGENCIES
Loss of Engine Oil Pressure
The OIL PRESS LOW annunciation will display on the PFD when the oil
pressure falls below 45 PSI. Complete loss of engine oil pressure will read
out on the oil pressure indicator and the pilot should be aware of the following:
• Complete loss of oil pressure will eventually result in the loss of propeller
control, since the propeller springs and centrifugal counterweights will drive
the propeller into the feathered position.
• Complete loss of oil pressure will eventually cause the engine to seize.
Therefore, it is not recommended that the pilot to continue to operate the
engine following a complete loss of oil pressure.
• Engine and propeller operation should be monitored closely for indications
of the onset of propeller feathering and engine seizure. The Engine Failure
checklist should be completed as soon as possible.
• Operating the engine at the minimum power required to sustain ight will
normally prolong the time until loss of engine and propeller thrust.
Operating the engine with the oil pressure indicating in the yellow range is
not considered to be critical, but is a denite cause for concern and should
be tolerated only for the purpose of completing the immediate ight. Do not
attempt a takeoff with the oil pressure indicating in the yellow range.
Fuel Control Unit Malfunctions
A malfunction in the pneumatic or governing section of the fuel control unit
may cause the engine power to decrease to a low idle condition. Fuel
control unit pneumatic or governing malfunctions can be identied by: an ITT
indication in the idle range of 500° to 600°C, an
indication of approximately
48-52% (this gure increases with altitude), and the engine not responding
to power lever input. If it is determined this type of malfunction has occurred,
the emergency power lever (fuel control unit manual override) should be used
to restore power to the engine. To use the fuel control unit manual override
system, place the engine power lever in the IDLE position and slowly move
the emergency power lever forward of its IDLE gate and advance as desired.
Any time the emergency power lever is moved forward of its NORMAL
position,
EMER PWR LVR will be annunciated.
CAUTION: When using the fuel control manual override system, engine
acceleration may be more rapid than when using the engine power lever.
Additional caution should be exercised to avoid exceeding the engine
operating limitations.
NOTE: When using the emergency power lever, closely monitor the gas
generator RPM when reducing power to idle. Keep the
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