# NTSB OAK77DVG67: Cessna 177RG, N35913, Trinity Center, CA, September 18, 1977

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: September 18, 1977
- Place: Trinity Center, CA · TRINITY CENTER, CA
- Location: 40.9841° N, 122.7083° W: Placed by OpenAirDocs: center of Trinity Center, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=40.9841&lon=-122.7083&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report January 24, 1978
- Report: Brief approved by the director
- NTSB case key (mKey): 144671
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK77DVG67
- Page: https://openairdocs.org/ntsb/OAK77DVG67

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3745  77/9/18  NR.TRINITY CENTER,CA  CESSNA 177RG        CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 42, 930
        TIME - 1900                    N35913              PX-  0  0  1  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 9 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          NEWPORT,OR                  REDDING,CA
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           GEAR COLLAPSED                                           LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           POWERPLANT - PROPELLER AND ACCESSORIES: OTHER
           POWERPLANT - ENGINE STRUCTURE: MASTER AND CONNECTING RODS
           MISCELLANEOUS ACTS,CONDITIONS - RPM-UNCONTROLLABLE-OVERSPEED
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           TERRAIN - ROUGH/UNEVEN
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- BROKEN O RING IN PROP GOV RELIEF VALVE ASSEMBLY ALLOWED OVERSPEED,NO 1,3,4 CONNCTNG RDS FAILD.
```

## Aircraft

- Registration: [N35913](https://openairdocs.org/aircraft/N35913), registered now, S/N 177RG1076, built 1976 (OpenAirDocs)
- Reported make and model: CESSNA 177RG
- Registry model: [Cessna 177RG](https://openairdocs.org/model/cessna-177rg) (registry code 2073709) (OpenAirDocs)
- Registry engine: [Lycoming IO-360-A1B6D](https://openairdocs.org/engine/lycoming-io-360-a1b6d) (registry code 41593, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19770918039449A](https://openairdocs.org/incident/19770918039449A), Sep 18, 1977: Cessna 177RG, Trinity Center, CA, Substantial damage. Broken o ring in prop gov relief valve assembly allowed overspeed,no 1,3,4 connctng rds faild.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.