# NTSB SEA70D0109: Monocoupe 110, N18642, Monroe, WA, October 19, 1969

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: October 19, 1969
- Place: Monroe, WA · MONROE, WA
- Location: 47.8598° N, 121.9840° W: Placed by OpenAirDocs: center of Monroe, WA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=47.8598&lon=-121.9840&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report May 15, 1970
- Report: Brief approved by the director
- NTSB case key (mKey): 152170
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA70D0109
- Page: https://openairdocs.org/ntsb/SEA70D0109

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4147  69/10/19   MONROE,WASH         MONOCOUPE 110       CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, FL.INSTR.,
        TIME - 1500                    N18642              PX-  0  0  1  PLEASURE/PERSONAL TRANSP  AGE 28, 547 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            4 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          SNOHOMISH,WASH              SNOHOMISH,WASH
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: ACROBATICS
           COLLISION WITH GROUND/WATER: UNCONTROLLED                LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           AIRFRAME - FLIGHT CONTROL SURFACES: HORIZONTAL STABILIZER, ATTACHMENTS
           PILOT IN COMMAND - EXCEEDED DESIGNED STRESS LIMITS OF AIRCRAFT
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
                                  SUSPECTED OR KNOWN AIRCRAFT DAMAGE
        REMARKS- R HORIZ STAB TWISTED DURING RECOVERY FROM PRACTICE SPIN. CRASH LANDED IN FLD.
```

## Aircraft

- Registration: [N18642](https://openairdocs.org/aircraft/N18642), registered now, S/N 6W53, built 1933 (OpenAirDocs)
- Reported make and model: MONOCOUPE 110
- Registry model: [Monocoupe 110](https://openairdocs.org/model/monocoupe-110) (registry code 5810202) (OpenAirDocs)
- Registry engine: [Warner SCARAB series](https://openairdocs.org/engine/warner-scarab-series) (registry code 64502, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N18642 (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 LAX07CA097](https://openairdocs.org/ntsb/LAX07CA097), Mar 1, 2007: Monocoupe 110 (N18642), Camarillo, CA, substantial damage. Probable cause: The pilot's failure to maintain directional control during the landing rollout that resulted in a ground loop.

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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