Overspeed; Low Oil Pressure During Flight - Lycoming IO-360-N1A Installation And Operation Manual

IO-360-N1A Engine Installation and Operation Manual
(b) If the engine is not operating smoothly in flight, make a safe landing as soon as possible.
Identify and correct the cause of rough operation.
(c) Additional measures could be necessary under specific operating conditions. Refer to the
IO-360-N1A Engine Maintenance Manual for corrective action.

Overspeed

1. In engine overspeed, the engine operates above its rated speed (rpm). Operation of an engine
above its rated rpm (specified in Appendix A) can cause accelerated wear on already stressed
components. Momentary overspeed can occur during a landing attempt, when the propeller
governor is in a lag as the throttle is suddenly opened for a go-around. In fixed wing aircraft,
momentary overspeed is an increase of no more than 10% of rated engine rpm for 3 seconds
or less.
2. Refer to the latest revision of Service Bulletin No. SB-369 for corrective action for engine
overspeed.
3. Record all incidents of engine overspeed in the engine logbook, along with the inspection and
any specified corrective action taken per the IO-360-N1A Engine Maintenance Manual.

Low Oil Pressure During Flight

Circumstances which cause loss of oil pressure are many and varied. Therefore, it is difficult to
make a prediction of the extent of damage to the engine or its future reliability. In case of oil
pressure loss or engine operation with oil below the recommended minimum operating level, the
most conservative action is to remove the engine, disassemble, and completely examine all
engine components per instructions in the IO-360-N1A Engine Maintenance Manual.
NOTICE: Very often a sudden loss of oil pressure also shows a sudden increase in oil
temperature.
Any time oil pressure falls below the minimum level, complete a safe landing of the aircraft as
soon as possible. Identify the root cause according to the protocol per the following progressive
steps:
1. Complete a check of the oil level in the oil sump. Drain the oil, if necessary, to measure the
oil quantity. Refer to Chapter 12-10 in the IO-360-N1A Engine Service Manual.
2. If the oil level is sufficient, complete a check of the accuracy of the oil pressure indication
system. If the oil pressure gage is not operating correctly, replace it.
3. Examine oil line connections for leaks. Tighten any loose connections and look for leaks.
Replace leaking oil lines.
© 2016 Avco Corporation. All Rights Reserved
February 2016
DO NOT USE WATER INITIALLY TO REMOVE THE ASH. WHEN
VOLCANIC ASH COMES INTO CONTACT WITH WATER IT CAN
FORM A HARDENED, CORROSIVE COMPOUND.
DO NOT OPERATE AN ENGINE CONTINUOUSLY AT AN OVERSPEED
RATE BECAUSE IT CAN WEAR OUT ENGINE PARTS AND
EVENTUALLY CAUSE ENGINE FAILURE.
Engine Conditions
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