Accident Beechcraft 58P Baron N6688D, Monday 2 September 2002
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Date:Monday 2 September 2002
Type:Silhouette image of generic B58T model; specific model in this crash may look slightly different    
Beechcraft 58P Baron
Owner/operator:6688Delta Inc
Registration: N6688D
MSN: TJ-242
Year of manufacture:1979
Total airframe hrs:2699 hours
Engine model:Teledyne Continental TSIO-520
Fatalities:Fatalities: 7 / Occupants: 7
Other fatalities:0
Aircraft damage: Destroyed
Location:Swanzey, NH -   United States of America
Phase: Landing
Departure airport:Keene Dillant-Hopkins Airport, NH (EEN/KEEN)
Destination airport:Yeager Airport, WV (CRW)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The six-passenger airplane arrived at the departure airport with a malfunctioning landing gear system. Due to lack of maintenance personnel, the pilot elected to conduct the accident flight with the landing gear extended. The airplane departed with seven occupants, near the certified gross weight. Witnesses observed the airplane flying about 200-300 feet above the ground, with its engines "sputtering and backfiring." The airplane made a left turn towards the airport, descended, and came to rest in a wooded area about 2 miles southeast of the airport. Examination of the right engine revealed the propeller was not feathered, and the number 5 cylinder head was fractured about 3/4 inch from the bottom of the upper portion of the head. A fatigue fracture initiated in the root radius of the cylinder head thread that engaged with the top thread on the cylinder barrel. Indentations and displaced material on the upper and lower flanks of the cylinder head threads matched with the locations of protruding material observed on the cylinder barrel threads. The protruding material was located on the flank/crown radius of the threads, and was consistent with the folding over of a burr into the thread, originating during the manufacturing process. The number 5 cylinder assembly consisted of a new cylinder head that had been installed on a remanufactured barrel. The right engine was remanufactured in 2001, and had accumulated about 140 total hours of operation since. According to 14 CFR Part 91.7, "No person may operate a civil aircraft unless it is in an airworthy condition. The pilot in command of a civil aircraft is responsible for determining whether that aircraft is in condition for safe flight. The pilot in command shall discontinue the flight when unairworthy mechanical, electrical, or structural conditions occur." According to 14 CFR Part 91.107, "...each person on board a U.S.-registered civil aircraft must occupy an approved seat or berth with a safety belt...during movement on the surface, takeoff, and landing." According to the Airplane Flying Handbook (FAA-H-8083-3), Transition to a Multiengine Airplanes, "When one engine fails on a multiengine airplane, performance is not halved, but is reduced by approximately 80 percent."

Probable Cause: The pilot's improper preflight planning and his decision to depart with known landing gear system mechanical deficiencies, which resulted in a forced landing during a partial loss of power on one engine. Factors related to the accident were the fatigue failure of an engine cylinder barrel, the inadequate manufacturing process of the cylinder barrel, and the pilot's inability to retract the landing gear.

Accident investigation:
Investigating agency: NTSB
Report number: NYC02FA178
Status: Investigation completed
Duration: 1 year and 9 months
Download report: Final report


FAA register: 2. FAA:



Photo: NTSB

Revision history:

28-Oct-2008 00:45 ASN archive Added
03-Mar-2016 22:58 Dr.John Smith Updated [Time, Operator, Location, Departure airport, Destination airport, Source, Narrative]
03-Mar-2016 22:58 Dr.John Smith Updated [Narrative]
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
09-Dec-2017 17:46 ASN Update Bot Updated [Operator, Departure airport, Destination airport, Source, Narrative]
21-May-2022 21:10 Captain Adam Updated [Operator, Location, Departure airport, Destination airport, Source, Narrative, Accident report, Photo]

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