ASN Wikibase Occurrence # 240549
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| Date: | Wednesday 26 August 2020 |
| Time: | 08:20 LT |
| Type: |  Cessna 210 Centurion |
| Owner/operator: | Private |
| Registration: | N9540T |
| MSN: | 57340 |
| Year of manufacture: | 1960 |
| Total airframe hrs: | 1173 hours |
| Engine model: | Continental IO-470 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Chino Airport (CNO/KCNO), Chino, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Chino Airport, CA (CNO/KCNO) |
| Chino Airport, CA (CNO/KCNO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that the accident flight was the first flight since the airplane had undergone recent landing gear maintenance. While in the airport traffic pattern, he extended the landing gear; however, he noticed that it would not lock into the down position. Despite multiple attempts to cycle the landing gear, which included using the emergency landing gear extension procedure, he was unable to obtain a positive down and locked indication. While landing, both main landing gear collapsed and the left wing and left horizontal stabilizer impacted the runway surface, which resulted in substantial damage to the left elevator and horizontal stabilizer.
Postaccident examination of the airplane revealed that the engine-driven hydraulic pump was not operational. No mechanical damage was observed within the engine's accessory case. No evidence of any preexisting mechanical malfunction was observed with the airframe or emergency gear extension system. Examination of the engine-driven hydraulic pump revealed a torn section of an oil seal that surrounded the pump drive shaft. The oil seal was hard, brittle, and torn, which resulted in an oil leak that prevented the pump from holding pressure, which likely prevented the landing gear from fully extending and locking into place during landing. The reason for the emergency gear extension system not functioning could not be determined.
Probable Cause: The failure of the engine-driven hydraulic pump, which resulted in the main landing gear not fully extending and locking into place during landing. Contributing to the accident was the failure of the emergency gear extension system for reasons that could not be determined.
Accident investigation:
 |
|
Sources:
NTSB WPR20LA288
https://flightaware.com/live/flight/N9540T
https://registry.faa.gov/AircraftInquiry/NNum_results.aspx?NNumbertxt=9540T
https://www.flickr.com/photos/chrisk48/5577877775
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Aug-2020 16:53 | Geno | Added |
| 08-Sep-2020 12:43 | ASN Update Bot | Updated [Operator, Departure airport, Destination airport, Source, Narrative] |
| 20-Jul-2022 08:59 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
| 20-Jul-2022 09:36 | harro | Updated [Source, Narrative] |
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