ASN Wikibase Occurrence # 248013
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| Date: | Thursday 18 February 2021 |
| Time: | 17:30 |
| Type: |  Aviat A-1C-200 Husky |
| Owner/operator: | Glasair III Investors LLC |
| Registration: | N43LL |
| MSN: | 3313 |
| Year of manufacture: | 2018 |
| Total airframe hrs: | 135 hours |
| Engine model: | Lycoming IO-360-A106 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Sky Ranch at Carefree (18AZ), Carefree, AZ -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Albuquerque-Double Eagle II Airport, NM (KAEG) |
| Sky Ranch at Carefree, AZ (18AZ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
On February 18, 2021, about 1730 mountain standard time, an Aviat Aircraft Inc. A-1C-200, N43LL, sustained substantial damage when it was involved in an accident in Carefree, Arizona. The commercial pilot and passenger were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.
The pilot reported that, during the approach to land, he disconnected the autopilot, and the airplane immediately yawed to the right. The pilot applied left pedal, engaged the yaw damper, and continued the approach. He subsequently disengaged the yaw damper and entered a cross-control slip to descend, and he was unable to make an effective left rudder input. The airplane touched down on the gravel runway surface and veered to the right. The airplane then crossed over to the asphalt runway surface and subsequently ground-looped.
The airplane’s autopilot had been installed in the airplane 7 weeks before the accident. Postaccident examination of the airframe revealed that the autopilot hardware installation was substandard. Specifically, the guard pin, which was designed to prevent the bridle cable from traveling out of the pulley’s groove past the sheaves, was not installed to the yaw servo tray and the right pulley assembly, which allowed the yaw servo bridle cable to separate from the pulley’s phenolic sheave. Additionally, the bridle cable, which was undertensioned, became trapped between the yaw servo pulley and the attachment tray and prohibited the pilot from applying left rudder. As a result, the pilot was unable to maintain directional control during the landing roll. The guard pin is designed to prohibit the bridle cable from being able to travel out of the pulley’s groove past the sheaves.
Probable Cause: The substandard installation of the airplane’s autopilot system hardware, which resulted in a malfunction of the rudder control system during flight and a loss of directional control during the landing roll.
Accident investigation:
 |
|
Sources:
NTSB
FAA
https://registry.faa.gov/aircraftinquiry/Search/NNumberResult
https://flightaware.com/live/flight/N43L
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Feb-2021 23:36 | Geno | Added |
Corrections or additions? ... Edit this accident description
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