# NTSB SEA77FYE21: Amer Avco AA-1B, N9950L, Silvana, WA, June 6, 1977

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 6, 1977
- Place: Silvana, WA · SILVANA, WA
- Location: 48.2018° N, 122.2458° W: Placed by OpenAirDocs: center of Silvana, WA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=48.2018&lon=-122.2458&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report July 26, 1977
- Report: Brief approved by the director
- NTSB case key (mKey): 147538
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA77FYE21
- Page: https://openairdocs.org/ntsb/SEA77FYE21

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1390   77/6/6  NR.SILVANA,WA         AMER AVCO AA-1B     CR-  0  0  2  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 0950                    N9950L              PX-  0  0  0  DUAL                      AGE 30, 539 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            175 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          EVERETT,WA                  LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: CONTROLLED                  LANDING: GO-AROUND
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - MISJUDGED ALTITUDE
           PILOT IN COMMAND - DELAYED IN INITIATING GO-AROUND
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SIMULATED CONDITIONS
        REMARKS- PRACTICE FORCED LNDG. IP BEGAN RCVRY TOO LOW,DRAGGED WINGTIP.
```

## Aircraft

- Registration: [N9950L](https://openairdocs.org/deregistered/N9950L-2025-11-21), registration cancelled 2025-11-21, S/N AA1B-0250 (OpenAirDocs)
- Reported make and model: AMER AVCO AA-1B
- Registry model: [Grumman American Avn. AA-1B](https://openairdocs.org/model/grumman-american-avn-aa-1b) (registry code 3960103) (OpenAirDocs)
- Registry engine: [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series) (registry code 41505, 4 cycle) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage

## 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 19770606014389A](https://openairdocs.org/incident/19770606014389A), Jun 6, 1977: Grumav AA1B, Silvana, WA, Substantial damage. Practice forced lndg. Ip began rcvry too low,dragged wingtip.

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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