ASN Wikibase Occurrence # 284838
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| Date: | Wednesday 30 May 2007 |
| Time: | 14:50 LT |
| Type: |  Cessna 340A |
| Owner/operator: | Echo Aviation LLC |
| Registration: | N17MH |
| MSN: | 340A-0797 |
| Total airframe hrs: | 4575 hours |
| Engine model: | Teledyne Continental TSIO-520-NB |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Middleton, Wisconsin -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Madison-Dane County Regional Airport, WI (MSN/KMSN) |
| Middleton, WI (C29) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot stated that multiple approaches and landings had been conducted during the dual proficiency flight. Prior to the accident landing, he observed three green lights indicating that the landing gear was properly extended. The landing touchdown was "light." A "few seconds" after touchdown the aircraft began to "shudder" and the gear horn started to sound. The airplane began to drift right and the right wing began to settle. As the right main gear collapsed, the aircraft departed the runway pavement, striking two runway lights in the process. The aircraft came to rest in a grass area adjacent to the runway. The nose and left main landing gear remained extended during the accident. A post accident examination of the aircraft revealed that the forward bellcrank attachment flange on the landing gear strut failed. In addition, the lower flange on the bellcrank had also failed. According to the airplane manufacturer, the location of the failures was consistent with the cumulative effect of improper adjustment of the downlock mechanism over time. However, any improper adjustment procedure could not be attributed to any specific maintenance action or to a particular mechanic. Additionally, the maintenance log entry related to the adjustments made during the most recent annual inspection indicated that the airplane maintenance manual instructions regarding landing gear adjustments were complied with properly.
Probable Cause: Failure of the right main landing gear extension and retraction linkage, which allowed the gear assembly to collapse during landing rollout. An additional cause was the improper adjustment procedure(s) by undetermined mechanic(s). The runway lights struck during the accident sequence were contributing factors.
Accident investigation:
 |
|
Sources:
NTSB CHI07LA159
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Oct-2022 09:28 | ASN Update Bot | Added |
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