# NTSB NYC78FGM25: Entwicklung B-1, N421F, Butler, PA, April 16, 1978

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: April 16, 1978
- Place: Butler, PA · BUTLER, PA
- Location: 40.8616° N, 79.8962° W: Placed by OpenAirDocs: center of Butler, PA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=40.8616&lon=-79.8962&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report October 31, 1978
- Report: Brief approved by the director
- NTSB case key (mKey): 142141
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC78FGM25
- Page: https://openairdocs.org/ntsb/NYC78FGM25

## NTSB brief (aircraft 2)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2594  78/4/16    BUTLER,PA           PIPER PA-28         CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 56, 1193
        TIME - 1410                    N48891              PX-  0  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, ALL IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  1                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - BUTLER-GRAHAM
        DEPARTURE POINT             INTENDED DESTINATION
          MARS,PA                     BUTLER,PA
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  LANDING: TRAFFIC PATTERN-CIRCLING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OTHER AIRCRAFT
           PERSONNEL - MISCELLANEOUS-PERSONNEL: PILOT OF OTHER AIRCRAFT
         SPECIAL DATA
          SEGMENTS OF AVIATION INVOLVED - SMALL US GEN.AV.-SMALL US GEN.AV.
          CONTROLLING AGENCY - NO CONTROL                          RADAR CTL/SURVEILLANCE - UNKNOWN/NOT REPORTED
          TRAFFIC ADVISORY ISSUED - NONE                           CONTROLLED/UNCONTROLLED AIRPORT - UNCONTROLLED AIRPORT
          CONTROL ZONE/AREA - NO                                   CONVERGENCE ANGLE-DEGREES -  0
          HORIZONTAL COLLISION ANGLE-DEGREES -   180               VERTICAL COLLISION ANGLE-DEGREES -  0
          EVASIVE ACTION TAKEN - NO                                ANTI-COLLISION LIGHTS - INSTALLED,OPERATION UNKNOWN
```

## NTSB brief (aircraft 1)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2594  78/4/16    BUTLER,PA           ENTWICKLUNG B-1     CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 26, 58 TOTAL
        TIME - 1410                    N421F               PX-  0  0  0  PLEASURE/PERSONAL TRANSP  HOURS, 3 IN TYPE, NOT
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  1                            INSTRUMENT RATED.
        NAME OF AIRPORT - BUTLER-GRAHAM
        DEPARTURE POINT             INTENDED DESTINATION
          BUTLER,PA                   LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  LANDING: TRAFFIC PATTERN-CIRCLING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OTHER AIRCRAFT
           PERSONNEL - MISCELLANEOUS-PERSONNEL: PILOT OF OTHER AIRCRAFT
         SPECIAL DATA
          SEGMENTS OF AVIATION INVOLVED - SMALL US GEN.AV.-SMALL US GEN.AV.
          CONTROLLING AGENCY - NO CONTROL                          RADAR CTL/SURVEILLANCE - UNKNOWN/NOT REPORTED
          TRAFFIC ADVISORY ISSUED - NONE                           CONTROLLED/UNCONTROLLED AIRPORT - UNCONTROLLED AIRPORT
          CONTROL ZONE/AREA - NO                                   CONVERGENCE ANGLE-DEGREES -  0
          HORIZONTAL COLLISION ANGLE-DEGREES -   180               VERTICAL COLLISION ANGLE-DEGREES -  0
          EVASIVE ACTION TAKEN - NO                                ANTI-COLLISION LIGHTS - INSTALLED,OPERATION UNKNOWN
```

## Aircraft 1

- Registration: N421F (not matched to a registry record)
- Reported make and model: ENTWICKLUNG B-1
- Category: Glider
- Engines: none
- Damage: Substantial damage
- Airport: Butler-Graham

## Aircraft 2

- Registration: N48891 (not matched to a registry record)
- Reported make and model: PIPER PA-28
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Butler-Graham

## 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 19780416026671A](https://openairdocs.org/incident/19780416026671A), Apr 16, 1978: Entwic PHOEBUSC, Butler, PA, 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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