NTSB Identification: LAX06CA027.
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Accident occurred Friday, November 04, 2005 in Tucson, AZ
Probable Cause Approval Date: 02/28/2006
Aircraft: Lee Kolb Mark III Classic, registration: N515AB
Injuries: 2 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The airplane made a forced landing after the horizontal stabilizer attachment failed in flight. The instructional flight departed with the intention of practicing takeoffs and landings. On the downwind leg, the pilots heard a loud bang. The airplane lurched nose up, then nose down. The flight instructor took control of the aircraft and informed the tower he had a flight control problem. He was able to land the aircraft using cross control inputs. The instructor inspected the airplane and determined that the right horizontal stabilizer had separated from the fuselage due to a stainless steel "L" bracket failure. The instructor attributed the failure to a loose bolt in the "L" bracket that allowed a vibration and caused metal fatigue of the component.

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

the fatigue failure of the attachment that secured the horizontal stabilizer to the fuselage.

Full narrative available

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