# NTSB SEA75AS023: Cessna 150L, N11383, Mt Vernon, WA, November 29, 1974

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: November 29, 1974
- Place: Mt Vernon, WA · MT VERNON, WA
- Location: 48.4171° N, 122.3118° W: Placed by OpenAirDocs: center of Mount Vernon, WA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=48.4171&lon=-122.3118&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 4 fatal
- Status: Completed, report March 28, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 144866
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA75AS023
- Page: https://openairdocs.org/ntsb/SEA75AS023

## NTSB brief (aircraft 2)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4279  74/11/29   MT VERNON,WASH      PIPER PA-32         CR-  2  0  0  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1340                    N3863W              PX-  0  0  0  DUAL                      AGE 43, 8537 TOTAL HOURS,
                                       DAMAGE-DESTROYED    OT-  2  0  0                            31 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          BELLINGHAM,WASH             SEATTLE,WASH
        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
           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 - YES
          HORIZONTAL COLLISION ANGLE-DEGREES -   18                EVASIVE ACTION TAKEN - UNKNOWN/NOT REPORTED
          ANTI-COLLISION LIGHTS - INSTALLED,OPERATION UNKNOWN
        REMARKS- INADEQUATE ATTENTION OUTSIDE AIRCRAFT.
```

## NTSB brief (aircraft 1)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4279  74/11/29   MT VERNON,WASH      CESSNA 150L         CR-  1  0  0  NONCOMMERCIAL             PRIVATE, AGE 20, 77 TOTAL
        TIME - 1340                    N11383              PX-  1  0  0  PLEASURE/PERSONAL TRANSP  HOURS, 23 IN TYPE, NOT
                                       DAMAGE-DESTROYED    OT-  2  0  0                            INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          SEATTLE,WASH                RETURN
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  IN FLIGHT: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - OPERATED CARELESSLY
           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 - YES
          HORIZONTAL COLLISION ANGLE-DEGREES -   18                EVASIVE ACTION TAKEN - UNKNOWN/NOT REPORTED
          ANTI-COLLISION LIGHTS - INSTALLED,OPERATION UNKNOWN
         FIRE AFTER IMPACT
        REMARKS- OBS STATED CESSNA DOVE & THEN PULLED UP.
```

## Aircraft 1

- Registration: [N11383](https://openairdocs.org/deregistered/N11383-1975-05-02), registration cancelled 1975-05-02, S/N 15075372, built 1973 (OpenAirDocs)
- Reported make and model: CESSNA 150L
- Registry model: [Cessna 150L](https://openairdocs.org/model/cessna-150l) (registry code 2071826) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

## Aircraft 2

- Registration: [N3863W](https://openairdocs.org/deregistered/N3863W-1975-06-09), registration cancelled 1975-06-09, S/N 32-806 (OpenAirDocs)
- Reported make and model: PIPER PA-32
- Registry model: [Piper PA-32-260](https://openairdocs.org/model/piper-pa-32-260) (registry code 7103206) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

## 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 19741129043842A](https://openairdocs.org/incident/19741129043842A), Nov 29, 1974: Cessna 150L, Mt Vernon, WA, Destroyed, 1 fatal. OBS stated Cessna dove & then pulled up.
- [Accident 19741129043841A](https://openairdocs.org/incident/19741129043841A), Nov 29, 1974: Piper PA32260, Mt Vernon, WA, Destroyed. Inadequate attention outside aircraft.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; 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.