# NTSB SEA70F0018: Brantly B-2, N5987X, Helena, MT, July 14, 1969

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 14, 1969
- Place: Helena, MT · HELENA, MT
- Location: 46.5955° N, 112.0187° W: Placed by OpenAirDocs: center of Helena, MT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=46.5955&lon=-112.0187&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report August 14, 1969
- Report: Brief approved by the director
- NTSB case key (mKey): 167522
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA70F0018
- Page: https://openairdocs.org/ntsb/SEA70F0018

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1935  69/7/14    HELENA,MONT         BRANTLY B-2         CR-  0  0  1  INSTRUCTIONAL             STUDENT, AGE 28, 40 TOTAL
        TIME - 1915                    N5987X              PX-  0  0  0  TRAINING                  HOURS, 28 IN TYPE, NOT
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - FUEL SYSTEM: CARBURETOR
           MISCELLANEOUS ACTS,CONDITIONS - STUCK
           MISCELLANEOUS ACTS,CONDITIONS - ENGINE LOADED UP
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        FACTOR(S)
           TERRAIN - ROUGH/UNEVEN
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- RICH MIXTURE DUE TO FLOAT STICKING.IMPROPER FUEL-AIR RATIO WITH RAPID APPLICATION OF CARB HEAT.
```

## Aircraft

- Registration: [N5987X](https://openairdocs.org/deregistered/N5987X-1977-12-05), registration cancelled 1977-12-05, S/N 125 (OpenAirDocs)
- Reported make and model: BRANTLY B-2
- Registry model: [Brantly B-2](https://openairdocs.org/model/brantly-b-2) (registry code 1440502) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N5987X (1)

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 MKC76FCD40](https://openairdocs.org/ntsb/MKC76FCD40), Apr 27, 1976: Brantley B-2B (N5987X), Marshalltown, IA, 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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