ASN Wikibase Occurrence # 236650
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| Date: | Sunday 31 May 2020 |
| Time: | 11:33 LT |
| Type: |  Zenith STOL CH 701 |
| Owner/operator: | Private |
| Registration: | N324WS |
| MSN: | 8836 |
| Year of manufacture: | 2014 |
| Total airframe hrs: | 289 hours |
| Engine model: | Rotax 912UL |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Ambler, AK -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Ambler, AK |
| Noorvik-Curtis Memorial Airport, AK (ORV/PFNO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot, who was also the owner and builder of the experimental amateur-built airplane, reported that he landed the airplane on sand dunes. Forty-five minutes later, he took off from the sand dunes, and during the takeoff roll, the airplane hit some bumps. Just before the airplane reached rotation speed, it hit a larger bump, which propelled it upward. The airplane then descended in a nose-high attitude and impacted terrain, followed immediately by the nose landing gear (NLG) collapsing. Subsequently, the airplane nosed over and came to rest inverted.
Postaccident examination of the airplane revealed that the rudder and both wing struts sustained substantial damage. The nosewheel fork had separated from the nose strut in three fragments at two fracture locations, one on each side of the nose strut attachment. Examination of the fracture surfaces revealed that all the fractures exhibited features consistent with overstress fracture in upward bending of the nosewheel fork. No evidence of preexisting cracks, wear marks, or corrosion was found. The pilot reported that the accident may have been prevented if he had conducted a more 'detailed' inspection of the takeoff area. Given the evidence, it is likely that, during the takeoff roll, the NLG impacted uneven terrain, which led to the airplane becoming airborne in a nose-up attitude and then impacting terrain with force that exceeded the nosewheel fork's structural capabilities and resulted in the nosewheel fracturing.
Probable Cause: The pilot's improper decision to take off from unsuitable terrain, which resulted in impact with uneven terrain, the subsequent failure of the nosewheel fork, and a nose over.
Accident investigation:
 |
|
Sources:
NTSB ANC20LA053
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-Jun-2020 21:39 | Captain Adam | Added |
| 01-Jul-2022 09:09 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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