ASN Wikibase Occurrence # 290201
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| Date: | Thursday 7 February 2013 |
| Time: | 16:00 LT |
| Type: |  Air Tractor AT-502 |
| Owner/operator: | South Delta Aviation Inc |
| Registration: | N198LA |
| MSN: | 502-0198 |
| Year of manufacture: | 1993 |
| Engine model: | P&W PT6A SER |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Forrest City, Arkansas -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | Forrest CIty, AR |
| Forrest CIty, AR | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
After making an agricultural application, the pilot made a climbing left turn; the airplane then began vibrating and shaking. The pilot was able to return the airplane to level flight, but it rocked left and right, with the left aileron going up and down from stop to stop. The pilot chose to perform an emergency landing in a field next to an airport. A postaccident examination of the airplane revealed that the two aileron push-pull rod bolts were missing. The bolts and associated hardware were not located among the wreckage. The airplane had undergone extensive maintenance about 5 months before the accident. A review of the airplane's maintenance manual revealed that the nuts installed in the airplane control system are self-locking nuts, which can loosen if insufficient torque is applied to them. It is likely that maintenance personnel applied improper torque to the aileron's push-pull rod self-locking nuts, which resulted in the eventual loosening of the nuts and the separation of the left aileron's push-pull rod and hardware.
Probable Cause: The in-flight separation of the left aileron's push-pull rod and hardware. Contributing to the accident was the failure of maintenance personnel to apply proper torque to the self-locking nuts.
Accident investigation:
 |
|
Sources:
NTSB CEN13LA168
History of this aircraft
Other occurrences involving this aircraft
| 29 May 2009 | N198LA | R | 0 | Mendota, Illinois | |
sub |
| Runway excursion | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 06-Oct-2022 12:02 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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