SDR CA980430002

Service difficulty report · Crankshaft · Cessna 172N

Difficulty date: April 15, 1998
Submitted: March 26, 2000
Operation: General aviation
Make and model: Cessna 172N
Engine: Lyc O320H2AD
Propeller: Mcauly 1C160DTM
System (JASC): 8520 · Reciprocating Engine Power Section
Part: Crankshaft
Condition: Cracked
Location: Engine
Part time: 2,139 hours
Stage of operation: IN
Nature of condition: O
Precautionary procedure: K

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

What was found

(CAN) WHILE CARRYING OUT AD 98-02-08 (LYCOMING SB 505B), INITIAL INSPECTION FOUND MODERATE AMOUNTS OF PITTING IN THE INSIDE DIAMETER OF THE CRANKSHAFT. NDT TESTING, PER THE SB, DETECTED TWO CRACKS, ONE .25 LONG, THE SECOND .50 LONG. THE ENGINE WAS REMOVED.

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