ASN Wikibase Occurrence # 179296
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| Date: | Friday 2 July 2004 |
| Time: | 19:36 |
| Type: |  Cessna 421B |
| Owner/operator: | Private |
| Registration: | N421KS |
| MSN: | 421B0507 |
| Year of manufacture: | 1973 |
| Total airframe hrs: | 4310 hours |
| Engine model: | Teledyne Continental GTSIO-520-H |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Portland International Jetport, Cumberland County, ME -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Groton-New London Airport, CT (GON/KGON) |
| Portland International Jetport, ME (PWM/KPWM) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Line personnel reported to the pilot that while the airplane had been parked on the ramp, heavy wind and rain "hydroplaned" the airplane across the ramp about 25 feet. After takeoff, the pilot retracted the landing gear and noticed an unfamiliar "clunking" noise during the retraction cycle. During the approach to the destination airport, he extended the landing gear and noted all three of the landing gear down and locked indicator lights were green. Sometime during the rollout he heard the "clunk" noise again, and the right wing began to settle lower than normal. The airplane then began to veer to the right and came to rest in the grass on the right side of runway. Examination of the right main landing gear revealed that two components of the down-lock mechanism had broken. The parts were submitted to the Safety Board Materials Laboratory. Metallurgical examination of the mating fractures revealed features typical of overstress separation. The fractures contained no evidence of fatigue.
Probable Cause: Failure of the right main landing gear down-lock mechanism resulting in the collapse of the right main landing gear.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20040726X01065&key=1
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Sep-2015 14:37 | Noro | Added |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 07-Dec-2017 18:11 | ASN Update Bot | Updated [Cn, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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