# NTSB FTW80DPJ01: Brantly B-2B, N2191U, Guymon, OK, October 1, 1979

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: October 1, 1979
- Place: Guymon, OK · GUYMON, OK
- Location: 36.6901° N, 101.4770° W: Placed by OpenAirDocs: center of Guymon, OK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.6901&lon=-101.4770&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report November 7, 1979
- Report: Brief approved by the director
- NTSB case key (mKey): 133392
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW80DPJ01
- Page: https://openairdocs.org/ntsb/FTW80DPJ01

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2524   79/10/1   GUYMON,OK           BRANTLY B-2B        CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, AGE 23, 527
        TIME - 1700                    N2191U              PX-  0  0  1  CORP/EXEC                 TOTAL HOURS, 65 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          GUYMON,OK                   LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      TAKEOFF: INITIAL CLIMB
           ROLL OVER                                                LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: TAIL ROTOR DRIVE SHAFT ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        REMARKS- TAIL ROTOR SHAFT COUPLING BOLT FAILED
```

## Aircraft

- Registration: [N2191U](https://openairdocs.org/aircraft/N2191U), registered now, S/N 402, built 1964 (OpenAirDocs)
- Reported make and model: BRANTLY B-2B
- Registry model: [Brantly B-2B](https://openairdocs.org/model/brantly-b-2b) (registry code 1440506) (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

## 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 19791001040389A](https://openairdocs.org/incident/19791001040389A), Oct 1, 1979: Hynes B2B, Guymon, OK, Substantial damage. Tail rotor shaft coupling broke on initial climb from hover. Helicopter rolled over on emergency landing.

## Other investigations on N2191U (2)

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.

- [NTSB NYC67A0149](https://openairdocs.org/ntsb/NYC67A0149), Apr 8, 1967: Brantly B-2B (N2191U), Burlington, CT, substantial damage
- [NTSB NYC65A0093](https://openairdocs.org/ntsb/NYC65A0093), Jan 1, 1965: Brantly B2B (N2191U), Oxon Hill, MD, destroyed

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.

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