SDR 95ZZZX1460

Service difficulty report · Cylinder · Beech F33A

Difficulty date: February 22, 1995
Submitted: March 26, 2000
Operation: General aviation
Aircraft: N1096W
Make and model: Beech F33A
Aircraft serial: CE436
Engine: Cont IO520BA
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Cylinder
Part number: 538288
Condition: Guide Loose
Location: Nr 1
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

DURING A ROUTE INPSECTION, NR 1 CYLINDER DISPLAYED LOW COMPRESSION. FURTHER INVESTIGATION, AFTER REMOVAL OF CYLINDER, REVEALED A LOOSE VALVE GUIDE IN THE CYLINDER HEAD. THIS ENGINE HAD BEEN OVERHAULED 70.0 HOURS PREVIOUS TO THE INSPECTION. CAUSE: INCORRECT TOLERANCES ON INSTALLATION. PREVENTION: INSPECTION OF GUIDES AFTER 100 HOURS OF OPERATION.

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