# NTSB OAK66A0036: Brantly B-2, N2136U, Sonoma, CA, March 2, 1966

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: March 2, 1966
- Place: Sonoma, CA · SONOMA, CA
- Location: 38.2903° N, 122.4598° W: Placed by OpenAirDocs: center of Sonoma, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=38.2903&lon=-122.4598&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor
- Status: Completed
- Report: Brief approved by the director
- NTSB case key (mKey): 174076
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK66A0036
- Page: https://openairdocs.org/ntsb/OAK66A0036

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0046   66/3/2  NR.SONOMA CALIF       BRANTLY B-2         CR-  0  0  2  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1300                    N2136U              PX-  0  0  0  DUAL                      AGE 27, 209 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            13 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - SONOMA VALLEY
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: CONTROLLED                  IN FLIGHT: HOVERING
        PROBABLE CAUSE(S)
           DUAL STUDENT - IMPROPER OPERATION OF FLIGHT CONTROLS
          FLT INSTR-INADEQUATE INSTRUCTION.
           PILOT IN COMMAND - INADEQUATE SUPERVISION OF FLIGHT
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - INSTRUCTIONS-MISINTERPRETED
        REMARKS- STUDENT ATTEMPTED HOVER DOWNWIND TURNAROUND
```

## Aircraft

- Registration: [N2136U](https://openairdocs.org/deregistered/N2136U-1971-04-09), registration cancelled 1971-04-09, S/N 184, built 1962 (OpenAirDocs)
- Reported make and model: BRANTLY B-2
- Registry model: [Brantly B-2](https://openairdocs.org/model/brantly-b-2) (registry code 1440502) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Sonoma Valley

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.