TEO-540-A1A Engine Maintenance Manual
05-20 © 2021 Avco Corporation. All Rights Reserved
Page 18 February 2021
YO-233-B2A Engine Maintenance Manual
4. 50-Hour Engine Inspection
A. The purpose of this inspection is to make sure that the engine operates correctly and agrees
with operational specifications.
B. Complete the 50-Hour Engine Inspection after every 50 hours of engine operation or every 4
months, whichever occurs first.
C. Complete the 50-hour Engine Inspection Checklist for this inspection.
WARNING
BEFORE ANY ENGINE INSPECTION OR SERVICE PROCEDURE,
MAKE SURE THE IGNITION SWITCH IS SET TO OFF AND THAT ALL
POWER TO THE ENGINE IS DISCONNECTED. ENSURE ALL
OBJECTS/PERSONNEL ARE CLEAR OF THE PROPELLER’S
ROTATIONAL ARC. IF POWER IS ON, A LOOSE OR BROKEN WIRE
CAN CAUSE THE ENGINE TO START AND THE PROPELLER TO
TURN WHICH CAN LEAD TO DEATH OR SERIOUS INJURY OR A
PROPELLER STRIKE.
NOTICE: Copy the blank checklist and complete the checklist as a record of engine
maintenance. Put the completed checklist in the engine logbook.
50-Hour Engine Inspection Checklist
Engine Model Number__________________ Engine Serial Number:______________
Date Inspection Done: ________ Inspection done by:______________________________
Aircraft Tachometer:____________________ Engine Time:_______________________
Complete the visual
inspection.
Refer to the “Visual Inspection”
section in this chapter.
Measure the oil level and
calculate the rate of
consumption.
If the rate of oil consumption is
not within limits repeat the steps
in the 25-Hour Engine
Inspection Checklist.
Refer to the "Oil Change
Procedure" in Chapter 12-10.
Collect an oil sample for
analysis.
If steel, copper or aluminum
particles are found in the oil
filter, examine the engine
cylinders and other metal
components for worn parts or
damage. Refer to the sections
"Engine Wear and Oil Analysis"
and "Guidelines for Results of
Oil Analysis" in Chapter 12-10.
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