# NTSB MKC74FER29: Brantly B2, N5920X, Rosemount, MN, December 21, 1973

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: December 21, 1973
- Place: Rosemount, MN · ROSEMOUNT, MN
- Location: 44.7394° N, 93.1258° W: Placed by OpenAirDocs: center of Rosemount, MN, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.7394&lon=-93.1258&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 21, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 187647
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC74FER29
- Page: https://openairdocs.org/ntsb/MKC74FER29

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3557  73/12/21   ROSEMOUNT,MINN      BRANTLY B2          CR-  0  0  2  INSTRUCTIONAL             AIRLINE TRANSPORT, AGE
        TIME - 1030                    N5920X              PX-  0  0  0  DUAL                      53, 14729 TOTAL HOURS, 31
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - SOUTHPORT
        DEPARTURE POINT             INTENDED DESTINATION
          ROSEMOUNT,MINN              LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           COLLIDED WITH: OBJECT                                    LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           MISCELLANEOUS - FOREIGN MATERIAL AFFECTING NORMAL OPERATIONS
           POWERPLANT - ENGINE STRUCTURE: OTHER
           MISCELLANEOUS ACTS,CONDITIONS - OIL EXHAUSTION-ENGINE LUBRICATION SYSTEM
           TERRAIN - ROUGH/UNEVEN
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- ENG VENT LINE FROZE CAUSING ENG CASE TO BLOW TOPCRANKSHAFT OIL SEAL.R SKID HIT LARGE DIRT CLOD.
```

## Aircraft

- Registration: [N5920X](https://openairdocs.org/deregistered/N5920X-2013-02-01), registration cancelled 2013-02-01, S/N 56, built 1960 (OpenAirDocs)
- Reported make and model: BRANTLY B2
- 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: Southport

## 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 19731221038419A](https://openairdocs.org/incident/19731221038419A), Dec 21, 1973: Hynes B2, Rosemount, MN, Substantial damage. Eng vent line froze causing eng case to blow topcrankshaft oil seal.r skid hit large dirt clod.

## Other investigations on N5920X (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 CHI75FEM47](https://openairdocs.org/ntsb/CHI75FEM47), Jun 15, 1975: Brantly B-2 (N5920X), Ionia, MI, substantial damage

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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