NTSB Identification: DFW05LA167.
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Accident occurred Tuesday, June 21, 2005 in Carizzo Springs, TX
Probable Cause Approval Date: 01/31/2006
Aircraft: Piper PA-23-250, registration: N2521M
Injuries: 4 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

While in cruise flight the 1,403-hour pilot noticed that the trim wheel had rotated almost 360 degrees from its original position, stopped, and rotated 180 degrees in the opposite direction with no pitch attitude changes. The pilot then felt a strong vibration moving forward and aft in the yoke, followed by a clacking sound. The pilot feathered both engines and subsequently made a forced landing following an in-flight loss of the stabilator trim control. Examination of the stabilator trim tab control rod, revealed evidence of internal corrosion at the stabilator trim tab rod. Further examination revealed evidence that the corrosion had reduced the thickness of the load carrying area of the stabilator trim tab control rod.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The failure of the stabilator trim control rod due to internal corrosion. A contributing factor was the lack of suitable terrain for the forced landing.

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