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| Date: | Monday 27 November 2023 |
| Time: | 13:05 |
| Type: |  Cessna 170B |
| Owner/operator: | Private |
| Registration: | N170HT |
| MSN: | 20347 |
| Total airframe hrs: | 5336 hours |
| Engine model: | Franklin 6A350-C1R |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Other fatalities: | 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Cameron Park Airport (O61), Cameron Park, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Sacramento-Mather Airport, CA (MHR/KMHR) |
| Cameron Park Airport, CA (O61) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
On November 27, 2023, about 1305 Pacific standard time, a Cessna 170B, N170HT, was substantially damaged when it was involved in an accident near Cameron Park, California. The pilot and passenger were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.
The pilot was landing at his destination airport when the airplane veered to the left after touchdown. The pilot attempted to correct the movement and turn the airplane back to the runway centerline with the addition of power and right rudder inputs, but the airplane then veered to the right and departed the right side of the runway.
The pilot did not recall experiencing any mechanical anomalies with the brakes during the accident flight and observed normal resistance during the landing. Postaccident examination of the brake system revealed that the right brake master cylinder failed to release pressure twice during testing and the piston had to be manually lifted before the cylinder would release pressure, which the pilot was unlikely to have been able to do during landing. The seized brake master cylinder was likely due to a deformed return spring that had bowed at some point during its service life. The manufacturer reported that the failure of the cylinder to release pressure would have resulted in a locked brake.
Although the pilot could not recall if he applied brakes, both his and the witness' recollection that the airplane abruptly turned right and departed the runway suggests that he may have applied right brake as the airplane was veering left. During this time the piston likely failed to release pressure due to the faulty return spring, which resulted in a runway excursion.
Probable Cause: A failure of the right brake master cylinder piston due to a faulty return spring, which resulted in a seized right main landing gear brake and a runway excursion
Accident investigation:
 |
|
Sources:
NTSB WPR24LA045
https://data.ntsb.gov/Docket?ProjectID=193449
Location
Media:
Earlier today, CAL FIRE AEU\'s Cameron Park Engines 88/89 and @ElDoradoSheriff responded to an aircraft incident at the CP Airport involving a single engine Cessna. The aircraft lost control during the landing, coming to a stop perpendicular to the runway. There were no injuries. pic.twitter.com/ehtnSdlTaH
— CAL FIRE AEU (@CALFIREAEU) November 28, 2023
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Nov-2023 09:03 | harro | Added |
| 28-Nov-2023 09:06 | harro | Updated [Registration, Cn, Operator, Other fatalities, Source, Embed code, ] |
| 28-Nov-2023 14:53 | harro | Updated [Total occupants, Other fatalities, Damage, ] |
| 20-Dec-2023 12:52 | Captain Adam | Updated [Time, Location, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report, ] |
| 01-Mar-2025 12:55 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Departure airport, Destination airport, Source, Embed code, Narrative, ] |
| 02-Mar-2025 20:36 | Captain Adam | Updated [Time, Destination airport, Source, Narrative, ] |
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