Accident Cessna T337G Pressurized Skymaster N8594M,
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ASN Wikibase Occurrence # 153492
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Date:Sunday 24 February 2013
Type:Silhouette image of generic P337 model; specific model in this crash may look slightly different    
Cessna T337G Pressurized Skymaster
Owner/operator:Exec Aviation Llc
Registration: N8594M
MSN: P3370006
Total airframe hrs:2096 hours
Engine model:Continental IO-360 SER
Fatalities:Fatalities: 0 / Occupants: 4
Aircraft damage: Substantial
Location:Biscayne Bay, Key Largo, FL -   United States of America
Phase: En route
Departure airport:Hollywood, FL (HWO)
Destination airport:Key West, FL (EYW)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The airplane was fueled before departure, and after fueling, the pilot reported that he checked the fuel tanks and fuel strainers and no contaminants were found. The facility that fueled the airplane reported no complaints or discrepancies related to the quality of fuel. The pilot departed and flew south along the coast at 900 feet above ground level when the rear engine suddenly lost power. The pilot was able to restart the rear engine, which regained only partial power, but not before losing 500 feet of altitude. Because of the low altitude, he did not want to troubleshoot the rear engine any further and opted to ditch the airplane with the landing gear extended. After touchdown, the airplane nosed over and all occupants exited the airplane and were rescued. The pilot further reported there was no issue related to the front engine.

Following recovery of the airplane, rear engine spark plugs tested satisfactorily. An alternate fuel supply was plumbed into the right wing root, and, after water and contaminants were removed from the internal portion of the rear engine, it was started but found to be only operating on the left magneto. The right magneto was replaced, and the engine was restarted and operated satisfactorily. A feather check of the rear propeller was performed during the engine run and no issues were noted.

The right magneto likely did not operate during the postaccident engine run because of internal moisture and corrosion due to salt water submersion. After cleaning the magneto, only the condenser tested outside its limits, most likely due to internal moisture. The magneto was placed on a test bench and it operated normally.

Postaccident testing of the rear engine did not reveal the reason for the reported loss of power.
Probable Cause: The reported partial loss of engine power from the rear engine for reasons that could not be determined because postaccident examination of the engine did not reveal any anomalies that would have precluded normal operation.

Accident investigation:
Investigating agency: NTSB
Report number: ERA13LA143
Status: Investigation completed
Download report: Final report




Revision history:

24-Feb-2013 16:50 Geno Added
25-Feb-2013 00:54 gerard57 Updated [Operator, Damage]
25-Feb-2013 10:47 Geno Updated [Aircraft type, Registration, Cn, Operator, Nature, Source, Damage, Narrative]
25-Feb-2013 14:17 RobertMB Updated [Aircraft type, Narrative]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
28-Nov-2017 14:08 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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