PA23 pilot reported an inflight engine failure that resulted in one cylinder lying on the wing.

Attributes
ACN	1308726
Time
Date	201511
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-23 Apache/Geronimo Apache
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	VFR
Component
Aircraft Component	Engine
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Commercial Flight Crew Multiengine Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 10 Flight Crew Total 2700 Flight Crew Type 500
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Engine started running rough; went through memory items & went for checklist. Bang; looked out on right wing and an outboard cylinder was lying on the wing (happened over the ocean). Shut down and secured right engine with accordance to checklist. Landed without incident. Taxied off runway; parked in tie-down. Inspected engine; the back outboard cylinder was the one that ended up on the wing. Cylinder was still attached by 2 wires; thus it stayed put on the wing.it seems like the assembly of the engine was incorrect or a mechanical failure. The engine only had 150 hours on it. Only damage done was to the engine.

Original NASA ASRS Text

Title: PA23 pilot reported an inflight engine failure that resulted in one cylinder lying on the wing.

Narrative: Engine started running rough; went through memory items & went for checklist. Bang; looked out on right wing and an outboard cylinder was lying on the wing (happened over the ocean). Shut down and secured right engine with accordance to checklist. Landed without incident. Taxied off runway; parked in tie-down. Inspected engine; the back outboard cylinder was the one that ended up on the wing. Cylinder was still attached by 2 wires; thus it stayed put on the wing.It seems like the assembly of the engine was incorrect or a mechanical failure. The engine only had 150 hours on it. Only damage done was to the engine.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.