# NTSB MKC73DCD12: Brantly B-2B, N2161U, Marshalltown, IA, August 6, 1972

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 6, 1972
- Place: Marshalltown, IA · MARSHALLTOWN, IA
- Location: 42.0343° N, 92.9063° W: Placed by OpenAirDocs: center of Marshalltown, IA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.0343&lon=-92.9063&mi=10
- Phase of flight: [Uncontrolled descent](https://openairdocs.org/ntsb-phases/650) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report April 17, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 168467
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC73DCD12
- Page: https://openairdocs.org/ntsb/MKC73DCD12

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3180   72/8/6  NR.MARSHALLTOWN,IOWA  BRANTLY B-2B        CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 46, 252
        TIME - 1630                    N2161U              PX-  0  0  1  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 139 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         UNKNOWN/NOT REPORTED        MARSHALLTOWN,IOWA
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        FACTOR(S)
           WEATHER - UNFAVORABLE WIND CONDITIONS
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        WEATHER FORECAST - FORECAST SUBSTANTIALLY CORRECT
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          NONE                                                      80
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
           30                                                       20
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
```

## Aircraft

- Registration: [N2161U](https://openairdocs.org/deregistered/N2161U-2014-09-16), registration cancelled 2014-09-16, S/N 322, built 1963 (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: Destroyed

## Other investigations on N2161U (3)

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 FTW84LA381](https://openairdocs.org/ntsb/FTW84LA381), Sep 8, 1984: Brantly Helicopter B-2B (N2161U), Alvin, TX, destroyed
- [NTSB MKC72FCD05](https://openairdocs.org/ntsb/MKC72FCD05), Jul 9, 1971: Brantly B2B (N2161U), Spencer, IA, substantial damage
- [NTSB UNK64X1811](https://openairdocs.org/ntsb/UNK64X1811), May 17, 1964: Brantly B2B (N2161U), Port Jefferson, NY, 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.

---
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.