Engine Conditions; Action For Engine Conditions - Lycoming IO-390-D Series Installation And Operation Manual

IO-390-D Series Engine Installation and Operation Manual

Action for Engine Conditions

Table 1 identifies action for engine conditions during engine start or operation. Detailed fault
isolation is included in the IO-390-D Series Engine Maintenance Manual.
NOTICE: Record any problems and maintenance-significant events in the engine logbook. Record
the magnitude and duration, and any out-of-tolerance values.
Condition
Engine roughness
Engine hesitates, misses
Low, high or surging rpm
Low, high or fluctuating oil
pressure
High oil temperature
Low or high fuel flow
Excessive manifold pressure
Engine Indication not available
Engine in an environment at
temperatures less than 10°F (-12°C)
for more than 2 hours
Stalled engine
Engine oscillation (either rpm or
manifold pressure)
Propeller strike, sudden stoppage
and lightning strikes
Engine does not hold rpm during
cruise, climb, or descent
Rapid decrease in cylinder head
temperature
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March 2020

ENGINE CONDITIONS

Table 1
Action for Engine Conditions
Make a safe landing and speak to Maintenance.
Make a safe landing and speak to Maintenance.
Make a safe landing and speak to Maintenance.
Make a safe landing and speak to Maintenance.
Make a safe landing and speak to Maintenance.
Make a safe landing and speak to Maintenance.
Make a safe landing and speak to Maintenance.
Make a safe landing and speak to Maintenance.
Refer to the section "Apply Heat to a Cold Engine" in this
chapter.
• Make sure the fuel selector is set to the correct fuel tank.
• Make sure that the auxiliary fuel pump is ON.
• Set the mixture to rich.
• Make sure that the ignition switch is set to BOTH.
• If the propeller has stopped turning, engage the starter.
If the engine restart procedure during flight is not
successful, complete a safe landing. Refer to the Aircraft
POH for complete procedures on in-flight loss of power.
Slowly decrease the throttle rpm until the oscillations STOP.
Then slowly increase rpm back to the desired operational
rpm. Complete a safe landing. Identify and correct the cause.
Make a safe landing. Refer to the IO-390-D Series Engine
Maintenance Manual for corrective action.
Make a safe landing and speak to Maintenance.
To prevent shock cooling, do not decrease cylinder head
temperature at a rate more than 50°F (10°C) per minute.
Action
Engine Conditions
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