Lycoming; Model O-360-A1H6; Fractured Intake Valve Alert

Lycoming; Model O-360-A1H6; Fractured Intake Valve Alert

Alert Extracted From:
AC No. 43-16A
Alert No. 316
November 2004

Lycoming; Model O-360-A1H6; Fractured Intake Valve; ATA 8530

During cruise flight, the pilot experienced surging manifold pressure on the left hand engine and a vibration was noticed on final approach.

An inspection revealed the number 2 cylinder intake valve was fractured with pieces in the number 2 and 3 combustion chambers. The cylinder head and piston tops were damaged from contact with broken valve pieces.

Part total time: 1,521.6 hours.

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