ASN Wikibase Occurrence # 292521
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| Date: | Wednesday 29 March 2006 |
| Time: | 10:42 LT |
| Type: |  Piper PA-44-180 Seminole |
| Owner/operator: | Embry-riddle Aeronautical University |
| Registration: | N938ER |
| MSN: | 44-96200 |
| Total airframe hrs: | 621 hours |
| Engine model: | Lycoming LO-360-A1H6 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Daytona Beach, Florida -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Daytona Beach International Airport, FL (DAB/KDAB) |
| Daytona Beach International Airport, FL (DAB/KDAB) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The landing gear was confirmed to be down and locked, three green annunciator lights were noted, and the nose landing gear was visually seen to be down and locked. The airplane touched down, veered sharply to the left and departed the runway. It collided with a runway distance remaining sign, damaging the right wing. Post-accident examination revealed the nose landing gear had collapsed. The upper drag brace (that connects the nose gear to the fuselage) was fractured, and the pivot lug (that connects the upper brace to the lower brace) was fractured in two places. The pivot lug fractures were consistent with overload stress separations. At least 13 internal horizontal and parallel cracks were uncovered near the vertical centerline of the brace. The cracks followed the grain flow lines resulting from forging. Flow lines were longitudinal in the arm portion of the brace with a smooth, gently curving transition into the thicker portion of the lug. However, flow lines in the upper fracture were convoluted and tightly twisted. A laboratory-induced fracture of the brace revealed an irregular boundary with ductile overstress features interspersed along the edge of the crack. Low magnification revealed a smooth, undulating surface. High magnification revealed a fine granular texture. Energy dispersive x-ray spectra revealed an increased oxygen level on the crack surface.
Probable Cause: Failure of the nose landing gear upper drag brace assembly due to overload acting on an undetected forging defect formed during the initial forging of the brace. A contributing factor in this accident was the runway distance remaining sign.
Accident investigation:
 |
|
Sources:
NTSB MIA06LA074
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Oct-2022 19:41 | ASN Update Bot | Added |
| 17-Nov-2022 15:48 | Ron Averes | Updated [Aircraft type, Narrative] |
Corrections or additions? ... Edit this accident description
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