# NTSB CHI67A0039: Brantly B2-B, N2172U, Northbrook, IL, September 11, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: September 11, 1966
- Place: Northbrook, IL · NORTHBROOK, IL
- Location: 42.1287° N, 87.8352° W: Placed by OpenAirDocs: center of Northbrook, IL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.1287&lon=-87.8352&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report May 16, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 121579
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI67A0039
- Page: https://openairdocs.org/ntsb/CHI67A0039

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0950  66/9/11    NORTHBROOK ILL      BRANTLY B2-B        CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 40, 84 TOTAL
        TIME - 1348                    N2172U              PX-  0  0  1  PLEASURE/PERSONAL TRANSP  HOURS, 68 IN TYPE, NOT
                                       DAMAGE-DESTROYED    OT-  0  0  0                            INSTRUMENT RATED.
        NAME OF AIRPORT - SKY HARBOR
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           COLLIDED WITH: BUILDING(S)                               IN FLIGHT: EMERGENCY DESCENT
        PROBABLE CAUSE(S)
           MISCELLANEOUS - FOREIGN MATERIAL AFFECTING NORMAL OPERATIONS
           PILOT IN COMMAND - EXERCISED POOR JUDGMENT
           MISCELLANEOUS ACTS,CONDITIONS - UNWARRANTED LOW FLYING
           TERRAIN - HIGH OBSTRUCTIONS
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- LOOSE CARBON UNSEATED NO.3 CYL EXH VALVE. HELICOPTER WAS AT LOW ALT OVER CONJESTED AREA AT TIME.
```

## Aircraft

- Registration: N2172U (not matched to a registry record)
- Reported make and model: BRANTLY B2-B
- Category: Helicopter
- Engines: reciprocating
- Damage: Destroyed
- Airport: Sky Harbor

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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