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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
6. 400-Hour Engine Inspection
A. Complete the 400-Hour Engine Inspection after every 400 hours of operation since the
engine has been in service.
B. Complete the 400-Hour Engine Inspection Checklist for this inspection.
WARNING
NOTICE: Copy the blank checklist and complete this checklist as a record of engine
maintenance. Put the completed checklist in the engine logbook.
Engine Model Number__________________
Date Inspection Done: ________ Inspection done by:_____________________________
Aircraft Tachometer:____________________
Inspection Item
Complete the 100-Hour Engine
Inspection.
Cylinders
Remove rocker box covers.
Look for evidence of abnormal wear
or broken parts in the area of the valve
tips, valve keeper, springs, and spring
seats. If any of these indications are
found, remove the cylinder and all of
its components (including the piston
and connecting rod assembly) and
examine for further damage.
Complete the Cylinder Borescope Inspection as per the "Cylinder Borescope Inspection Procedure"
in Chapter 72-30 of this manual. Record the results below.
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
© 2021 Avco Corporation. All Rights Reserved
February 2021
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.
400-Hour Engine Inspection Checklist
Refer to the section "100-
Hour or Annual
Inspection" in this chapter.
Engine Serial Number:______________
Engine Time:_______________________
Comments
Results/Notes
Done
05-20
Page 29
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