# NTSB SEA70D0023: Thorp T-18, N3715, Puyallup, WA, July 1, 1969

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: July 1, 1969
- Place: Puyallup, WA · PUYALLUP, WA
- Location: 47.1790° N, 122.2915° W: Placed by OpenAirDocs: center of Puyallup, WA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=47.1790&lon=-122.2915&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report September 11, 1969
- Report: Brief approved by the director
- NTSB case key (mKey): 169281
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA70D0023
- Page: https://openairdocs.org/ntsb/SEA70D0023

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2267   69/7/1    PUYALLUP,WASH       THORP T-18          CR-  0  0  1  MISCELLANEOUS             PRIVATE, AGE 30, 234
        TIME - 1900                    N3715               PX-  0  0  0  TEST                      TOTAL HOURS, 2 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - THUN
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            LANDING: TRAFFIC PATTERN-CIRCLING
           COLLIDED WITH: TREES                                     LANDING: OTHER
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE CONTROLS: THROTTLE-POWER LEVER ASSEMBLIES
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: POOR/INADEQUATE DESIGN
           MISCELLANEOUS ACTS,CONDITIONS - CONGESTED TRAFFIC-PATTERN
           TERRAIN - HIGH OBSTRUCTIONS
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- UN REDUCE PWR W/THROTTLE,USED MXTR CTL.EXTENDED DOWNWIND DUE TRAFFIC.UN REGAIN PWR LANDED IN TREES
```

## Aircraft

- Registration: [N3715](https://openairdocs.org/deregistered/N3715-2012-01-11), registration cancelled 2012-01-11, S/N 66, built 1969 (OpenAirDocs)
- Reported make and model: THORP T-18
- Registry model: [Thorp T-18](https://openairdocs.org/model/thorp-t-18) (registry code 89510S7) (OpenAirDocs)
- Registry engine: [Lycoming 0-290 series](https://openairdocs.org/engine/lycoming-0-290-series) (registry code 41506, 4 cycle) (OpenAirDocs)
- Category: Airplane, amateur-built
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Thun

## Other investigations on N3715 (1)

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.

- [NTSB SEA07CA185](https://openairdocs.org/ntsb/SEA07CA185), Jun 26, 2007: Hammer Thorp T-18 (N3715), Everett, WA, substantial damage. Probable cause: Excessive airspeed during a return for landing which resulted in an overrun. An unlatched canopy, a proper touchdown point not attained and rough terrain were factors.

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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