# NTSB DEN77FA034: Cessna 150, N50513, Boulder, CO, April 9, 1977

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: April 9, 1977
- Place: Boulder, CO · BOULDER, CO
- Location: 40.0244° N, 105.2513° W: Placed by OpenAirDocs: center of Boulder, CO, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=40.0244&lon=-105.2513&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 3 fatal
- Status: Completed, report June 8, 1977
- Report: Brief approved by the director
- NTSB case key (mKey): 158090
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN77FA034
- Page: https://openairdocs.org/ntsb/DEN77FA034

## NTSB brief (aircraft 2)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0888   77/4/9    BOULDER,CO          BELLANCA 8KCAB      CR-  1  0  0  NONCOMMERCIAL             PRIVATE, AGE 35, 240
        TIME - 1235                    N88261              PX-  0  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 20 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  2  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - BOULDER MUNICIPAL
        DEPARTURE POINT             INTENDED DESTINATION
          BOULDER,CO                   LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OTHER AIRCRAFT
         SPECIAL DATA
          SEGMENTS OF AVIATION INVOLVED - SMALL US GEN.AV.-SMALL US GEN.AV.
          CONTROLLING AGENCY - NO CONTROL                          RADAR CTL/SURVEILLANCE - NOT UNDER RADAR CONTACT
          TRAFFIC ADVISORY ISSUED - NONE                           CONTROL ZONE/AREA - NO
          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
----------------------------------------------------------------------------------------------------------------------------
3-0888   77/4/9    BOULDER,CO          CESSNA 150          CR-  1  0  0  NONCOMMERCIAL             COMMERCIAL, AGE 58, 762
        TIME - 1235                    N50513              PX-  1  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 217 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  1  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - BOULDER MUNICIPAL
        DEPARTURE POINT             INTENDED DESTINATION
          BOULDER,CO                  LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           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 - NOT UNDER RADAR CONTACT
          TRAFFIC ADVISORY ISSUED - NONE                           CONTROL ZONE/AREA - NO
          EVASIVE ACTION TAKEN - NO                                ANTI-COLLISION LIGHTS - INSTALLED,OPERATION UNKNOWN
```

## Aircraft 1

- Registration: [N50513](https://openairdocs.org/deregistered/N50513-1977-08-03), registration cancelled 1977-08-03, S/N 15069359 (OpenAirDocs)
- Reported make and model: CESSNA 150
- Registry model: [Cessna 150J](https://openairdocs.org/model/cessna-150j) (registry code 2071820) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed
- Airport: Boulder Municipal

## Aircraft 2

- Registration: [N88261](https://openairdocs.org/deregistered/N88261-1977-07-22), registration cancelled 1977-07-22, S/N 161-74, built 1974 (OpenAirDocs)
- Reported make and model: BELLANCA 8KCAB
- Registry model: [Bellanca 8KCAB](https://openairdocs.org/model/bellanca-8kcab) (registry code 1220801) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed
- Airport: Boulder Municipal

## FAA reports on this event (2)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19770409011892A](https://openairdocs.org/incident/19770409011892A), Apr 9, 1977: Cessna 150J, Boulder, CO, Destroyed, 1 fatal
- [Accident 19770409011891A](https://openairdocs.org/incident/19770409011891A), Apr 9, 1977: Blanca 8KCAB, Boulder, CO, Destroyed

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.