Service difficulty report · Crankcase · Cessna 172P

Difficulty date
May 3, 2023
Submitted
May 3, 2023
Operation
General aviation
Aircraft
N65497
Make and model
Cessna 172P
Aircraft serial
17275765
Engine
Lyc O320D2J
Engine time
618 hours
Part
Crankcase
Part number
50153813
Condition
Unknown
Location
Unknown
Part time
618 hours
Component
Crankcase Bolt · Lyc
Component part number
50153813
Stage of operation
CL
How discovered
V
Nature of condition
R
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

ON AUGUST 23, 2022 AN ENGINE EXAMINATION WAS CONDUCTED AT AIR SALVAGE OF DALLAS UNDER FAA OVERSIGHT. A GVI ON THE NUMBER 1 CYLINDER FOUND 4 SMALLER DIAMETER STUDS AND 1 LARGER DIAMETER STUD FRACTURED. THESE DECK STUD BOLTS EXHIBITED FATIGUE FAILURE/INDUCTILE OVERLOAD BASED ON TORQUE SEQUENCING. THE ENGINE INSPECTION FOUND NO ADDITIONAL ITEMS OF CONCERN THAT WOULD PRECLUDE IT FROM OPERATING. ENGINE LOG IDENTIFIES OVERHAULED ENGINE SERIAL NUMBER L-10451-39A ON JANUARY 16, 2019 WITH TSMO 0.0. CURRENT 100-HOUR/ANNUAL ENGINE INSPECTION ON SERIAL NUMBER L-10451-39A WAS COMPLETED ON APRIL 6, 2023 WITH TSMO: 618.4.

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