ASN Wikibase Occurrence # 295321
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| Date: | Monday 25 August 2003 |
| Time: | 12:30 LT |
| Type: |  Aero Commander Callair A-9B |
| Owner/operator: | Teton Avjet, Ltd, LLC |
| Registration: | N7924V |
| MSN: | 1563 |
| Total airframe hrs: | 4587 hours |
| Engine model: | Lycoming IO-540-G1C5 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Driggs, Idaho -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Driggs, ID (U59) |
| (U59) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During takeoff with a glider in tow, while passing through an altitude of 200 feet above the ground (agl), the aircraft's engine experienced a catastrophic failure. The pilot then released the glider and executed a forced landing on nearby terrain. Although the touchdown was successful, the aircraft hit a fence before the pilot could bring it to a stop. A teardown examination of the engine determined that the circlip holding one of the counterweight roller pin retaining washers had come out of the groove in the counterweight body. This lead to the roller pin coming in contact with the number five and number six connecting rods, and ultimately to the catastrophic failure. A comparison of wear pattern development on the subject circlip with the others on the counterweight body determined that it had come out of its retaining groove soon after the counterweight was overhauled about 21 hours prior to the accident. Wear patterns also indicated that the subject circlip had been installed with its "sharp edge" facing inwards, which is contradictory to the instructions contained in Textron Lycoming Service Instruction 1012F.
Probable Cause: A loss of engine power due to the improper installation of a counterweight roller pin retaining washer circlip, leading to the circlip coming out of its groove and the counterweight roller pin coming in contact with two of the engines connecting rods. Contributing to the accident were the fence and the uneven terrain.
Accident investigation:
 |
|
Sources:
NTSB SEA03FA179
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Oct-2022 07:04 | ASN Update Bot | Added |
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