ASN Wikibase Occurrence # 202105
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Date: | Sunday 4 April 1999 |
Time: | 14:30 LT |
Type: | Cessna 180J Skywagon 6 |
Owner/operator: | Bobby Graham |
Registration: | N420SB |
MSN: | 18052313 |
Total airframe hrs: | 3990 hours |
Engine model: | Continental O-470-R |
Fatalities: | Fatalities: 0 / Occupants: 2 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Iliamna, AK -
United States of America
|
Phase: | Landing |
Nature: | Private |
Departure airport: | , AK |
Destination airport: | Palmer, AK (PAQ) |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:The pilot was landing the wheel/ski equipped airplane on a frozen lake to wait for improving weather. During the landing roll, the pilot heard a 'whump' and the airplane settled onto the left wing. Inspection revealed the main landing gear attaching bolt had fractured in overload across a threaded area. The installed NAS-147R bolt was not the one specified for installation, and had a shorter smooth shank section (1.3 inches) than the specified AN bolt (1.43 inches). When an undamaged NAS-147R bolt is installed in the landing gear, a threaded area remains within the bolt hole. The bolt had been installed three weeks prior to the accident during the last annual inspection.
Probable Cause: The improper installation of the main landing gear attaching bolt by maintenance personnel, which resulted in total failure of the bolt and collapse of the landing gear.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | ANC99LA042 |
Status: | Investigation completed |
Duration: | 1 year and 2 months |
Download report: | Final report |
|
Sources:
NTSB ANC99LA042
History of this aircraft
Other occurrences involving this aircraft Location
Revision history:
Date/time | Contributor | Updates |
26-Nov-2017 12:37 |
ASN Update Bot |
Added |
08-Apr-2024 07:42 |
ASN Update Bot |
Updated [Time, Operator, Other fatalities, Departure airport, Source, Narrative, Category, Accident report] |
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