# NTSB ANC73AA040: Cessna 180D, N3156D, Cooper Ldg, AK, February 4, 1973

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: February 4, 1973
- Place: Cooper Ldg, AK · COOPER LDG, AK
- Location: 60.4900° N, 149.8342° W: Placed by OpenAirDocs: center of Cooper Landing, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=60.4900&lon=-149.8342&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 6 fatal
- Status: Completed, report April 19, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 169864
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC73AA040
- Page: https://openairdocs.org/ntsb/ANC73AA040

## NTSB brief (aircraft 2)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0416   73/2/4    COOPER LDG,ALAS     PIPER PA-20         CR-  1  0  0  NONCOMMERCIAL             PRIVATE, AGE 29, 200
        TIME - 1230                    N7698K              PX-  1  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 50 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  4  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          KENAI,ALAS                 UNKNOWN/NOT REPORTED
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  IN FLIGHT: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OTHER AIRCRAFT
        FACTOR(S)
           WEATHER - OTHER
           MISCELLANEOUS ACTS,CONDITIONS - SUNGLARE
        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                  TYPE OF WEATHER CONDITIONS
          NONE                                                     VFR
        TYPE OF FLIGHT PLAN
          NONE
         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
          CONVERGENCE ANGLE-DEGREES -  0                           HORIZONTAL COLLISION ANGLE-DEGREES -   290
          EVASIVE ACTION TAKEN - UNKNOWN/NOT REPORTED
        REMARKS- RESTRICTED VISIBILITY DUE TO BRIGHT SUN.
```

## NTSB brief (aircraft 1)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0416   73/2/4    COOPER LDG,ALAS     CESSNA 180D         CR-  1  0  0  NONCOMMERCIAL             PRIVATE, AGE 33, 863
        TIME - 1230                    N3156D              PX-  3  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 183 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  2  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          ANCHORAGE,ALAS              LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  IN FLIGHT: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OTHER AIRCRAFT
        FACTOR(S)
           WEATHER - OTHER
           MISCELLANEOUS ACTS,CONDITIONS - SUNGLARE
        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                  TYPE OF WEATHER CONDITIONS
          NONE                                                     VFR
        TYPE OF FLIGHT PLAN
          NONE
         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
          CONVERGENCE ANGLE-DEGREES -  0                           HORIZONTAL COLLISION ANGLE-DEGREES -   110
          VERTICAL COLLISION ANGLE-DEGREES -  *ERROR-INVALID CODE* EVASIVE ACTION TAKEN - UNKNOWN/NOT REPORTED
        REMARKS- RESTRICTED VISIBILITY DUE TO BRIGHT SUN.
```

## Aircraft 1

- Registration: [N3156D](https://openairdocs.org/deregistered/N3156D-1973-06-26), registration cancelled 1973-06-26, S/N 31954, built 1955 (OpenAirDocs)
- Reported make and model: CESSNA 180D
- Registry model: [Cessna 180](https://openairdocs.org/model/cessna-180) (registry code 2072602) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

## Aircraft 2

- Registration: [N7698K](https://openairdocs.org/deregistered/N7698K-1973-06-25), registration cancelled 1973-06-25, S/N 20-519 (OpenAirDocs)
- Reported make and model: PIPER PA-20
- Registry model: [Piper PA-20](https://openairdocs.org/model/piper-pa-20) (registry code 7102002) (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 19730204005591A](https://openairdocs.org/incident/19730204005591A), Feb 4, 1973: Cessna 180E, Cooper Ldg, AK, Destroyed, 3 fatal. Restricted visibility due to bright sun.
- [Accident 19730204005592A](https://openairdocs.org/incident/19730204005592A), Feb 4, 1973: Piper PA20115, Cooper Ldg, AK, Destroyed, 1 fatal. Restricted visibility due to bright sun.

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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