Accident Kolb Mark III Classic N515AB, Friday 4 November 2005
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Date:Friday 4 November 2005
Time:09:30 LT
Type:Kolb Mark III Classic
Registration: N515AB
MSN: 101553
Total airframe hrs:545 hours
Engine model:Rotax 912S
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Location:Tucson, Arizona -   United States of America
Phase: Unknown
Departure airport:Tucson-Ryan Field, AZ (KRYN)
Destination airport:Tucson-Ryan Field, AZ (KRYN)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
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.

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

Accident investigation:
Investigating agency: NTSB
Report number: LAX06CA027
Status: Investigation completed
Duration: 3 months
Download report: Final report



Revision history:

09-Oct-2022 10:04 ASN Update Bot Added

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