# NTSB SEA73AS033: Amer Avco AA-1B, W.Yellowstne, MT, May 15, 1973

- Type: NTSB accident investigation
- Date: May 15, 1973
- Place: W.Yellowstne, MT · W.YELLOWSTNE, MT
- Location: 44.6622° N, 111.1070° W: Placed by OpenAirDocs: center of West Yellowstone, MT, within about 6 miles (OpenAirDocs)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed
- Report: DirectorBrief, June 1, 1973
- NTSB case key (mKey): 169521
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA73AS033
- Page: https://openairdocs.org/ntsb/SEA73AS033

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0853  73/5/15    W.YELLOWSTNE,MONT   AMER AVCO AA-1B     CR-  1  0  0  MISCELLANEOUS             PRIVATE, AGE 23, 300
        TIME - 1000                    N9638L              PX-  1  0  0  FERRY                     TOTAL HOURS, 40 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - WEST YELLOWSTONE
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          W.YELLOWSTNE,MONT           LIVINGSTON,MONT             UNKNOWN/NOT REPORTED
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           STALL                                                    IN FLIGHT: CLIMB TO CRUISE
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO OBTAIN/MAINTAIN FLYING SPEED
        FACTOR(S)
           PILOT IN COMMAND - LACK OF FAMILIARITY WITH AIRCRAFT
           WEATHER - HIGH DENSITY ALTITUDE
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        WEATHER FORECAST - FORECAST SUBSTANTIALLY CORRECT
        MISSING AIRCRAFT - LATER RECOVERED
        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                  TEMPERATURE-F
          NONE                                                      63
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          200                                                       8
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
         FIRE AFTER IMPACT
        REMARKS- RECOVERED 5/17/73. DENSITY ALT ABOUT 8500 FT.PLT BELIEVED UNFAMILIAR WITH MTN OPNS.
```

## Sequence of events

- Enroute-climb to cruise

## Aircraft

- Registration: N9638L, a cancelled registration (https://openairdocs.org/deregistered/N9638L-1973-06-25) (OpenAirDocs)
- Reported make and model: AMER AVCO AA-1B
- Registry model: Grumman American Avn. AA-1B (registry code 3960103, https://openairdocs.org/model/grumman-american-avn-aa-1b) (OpenAirDocs)
- Category: Airplane
- Damage: Destroyed
- Airport: WEST YELLOWSTONE
- FAA reports: 19730515012029A (https://openairdocs.org/incident/19730515012029A) (OpenAirDocs)

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.

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From OpenAirDocs.org, an independent open copy of NTSB and FAA data. The NTSB's own report is the official record of an investigation.