# NTSB MKC76DER12: Brantley B-2, N5988X, Mankato, MN, July 25, 1975

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 25, 1975
- Place: Mankato, MN · MANKATO, MN
- Location: 44.1711° N, 93.9756° W: Placed by OpenAirDocs: center of Mankato, MN, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.1711&lon=-93.9756&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report November 3, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 150005
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC76DER12
- Page: https://openairdocs.org/ntsb/MKC76DER12

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2918  75/7/25    MANKATO,MN          BRANTLEY B-2        CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, AGE 48, 3706
        TIME - 2100                    N5988X              PX-  0  0  0  PRACTICE                  TOTAL HOURS, 0 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - PRIVATE AIRSTRIP
        DEPARTURE POINT             INTENDED DESTINATION
          MANKATO,MN                  LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ROLL OVER                                                IN FLIGHT: HOVERING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - ATTEMPTED OPERATION BEYOND EXPERIENCE/ABILITY LEVEL
           PILOT IN COMMAND - LACK OF FAMILIARITY WITH AIRCRAFT
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
           PILOT IN COMMAND - EXERCISED POOR JUDGMENT
        REMARKS- ALL FLT HRS IN HELICOPTERS WAS IN BELL 47G2.NO DUAL INSTRUCTION THIS MAKE MODEL ONLY DEMO FLT.
```

## Aircraft

- Registration: [N5988X](https://openairdocs.org/deregistered/N5988X-2013-04-24), registration cancelled 2013-04-24, S/N 132, built 1959 (OpenAirDocs)
- Reported make and model: BRANTLEY 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: Private Airstrip

## Other investigations on N5988X (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 MKC72FCD10](https://openairdocs.org/ntsb/MKC72FCD10), Jul 17, 1971: Brantly B-2 (N5988X), Whiting, IA, no damage
- [NTSB MKC68A0026](https://openairdocs.org/ntsb/MKC68A0026), Sep 28, 1967: Brantly B-2 (N5988X), Merriman, NE, 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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