3. 25-Hour Initial and Routine Engine Inspection
A. The purpose of this inspection is to measure the oil level and oil consumption, and identify
any oil leaks.
B. Complete the 25-Hour Engine Inspection at the following times:
— After 25 hours of initial operation of a new, repaired, or rebuilt/overhauled engine for the
first (engine-break-in) or after the first 6 months since the engine was placed in service
(whichever comes first)
— After one or more new engine cylinders and/or piston rings have been installed
— If the rate of oil consumption has not stabilized, repeat this inspection after the next 50
hours of operation. Refer to the "Oil Consumption" section in Chapter 12-10.
C. Complete the 25-hour Initial and Routine 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.
Engine Model Number__________________ Engine Serial Number:______________
Date Inspection Done: ________ Inspection done by:_____________________________
Aircraft Tachometer:____________________ Engine Time:_______________________
NOTICE: At 25 hours after the first oil sump suction screen cleaning - complete an oil change,
filter replacement and oil sump suction screen check for new, remanufactured or
newly overhauled engines and for engines with any newly installed cylinders.
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