SDR 2016FA0000038

Service difficulty report · Piston Ring · Cessna 320D

Difficulty date: December 20, 2015
Submitted: January 28, 2016
Operation: General aviation
Aircraft: N3308Q
Make and model: Cessna 320D
Aircraft serial: 320D0108
Engine: Cont TSIO520B
System (JASC): 8520 · Reciprocating Engine Power Section
Part: Piston Ring
Part number: AEC631397
Condition: Broken
Location: Nr 2 Cylinder
Stage of operation: IN
How discovered: 9
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

NR 1 AND NR 2 TOP RING LAN FAILURE. ENGINE LOSS OF COMRESSION. FOUND LOOKING AT TOP OF PISTON FROM ABOUT 7 O`CLOCK POSITION TO 11 O`CLOCK RING LAN MISSING AND BROKEN RINGS. OPERATION AT 11,000 FT, 68 PERCENT POWER ENGINE DEVELOPED A VIBRATION. POSSIBLE DEFECTIVE PISTON.

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