# NTSB FTW75DPA12: Harmon Monopl, N7UN, Sherman, TX, October 20, 1974

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: October 20, 1974
- Place: Sherman, TX · SHERMAN, TX
- Location: 33.6357° N, 96.6089° W: Placed by OpenAirDocs: center of Sherman, TX, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=33.6357&lon=-96.6089&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report November 20, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 141103
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW75DPA12
- Page: https://openairdocs.org/ntsb/FTW75DPA12

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3213  74/10/20   SHERMAN,TEX         HARMON MONOPL       CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 33, 95 TOTAL
        TIME - 1415                    N7UN                PX-  0  0  0  PLEASURE/PERSONAL TRANSP  HOURS, 2 IN TYPE, NOT
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        NAME OF AIRPORT - GRAYSON COUNTY
        DEPARTURE POINT             INTENDED DESTINATION
          SHERMAN,TEX                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            TAKEOFF: INITIAL CLIMB
           STALL: MUSH                                              LANDING: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF POWERPLANT & POWERPLANT CONTROLS
           MISCELLANEOUS ACTS,CONDITIONS - ANTI-ICING/DEICING EQUIPMENT-IMPROPER OPERATION OF/OR FAILED TO USE
           MISCELLANEOUS ACTS,CONDITIONS - ICE-CARBURETOR
           PILOT IN COMMAND - FAILED TO OBTAIN/MAINTAIN FLYING SPEED
        FACTOR(S)
           WEATHER - CONDITIONS CONDUCIVE TO CARB./INDUCTION SYSTEM ICING
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING ON AIRPORT/SEAPLANE BASE/HELIPT.
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          SCATTERED                                                UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  RELATIVE BEARING OF WIND
          NONE                                                     LEFT QUARTERING HEAD WIND 293-337 DEGREES
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
           90                                                       6
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
```

## Aircraft

- Registration: [N7UN](https://openairdocs.org/deregistered/N7UN-2013-05-06), registration cancelled 2013-05-06, S/N 1, built 1974 (OpenAirDocs)
- Reported make and model: HARMON MONOPL
- Registry model: [Harmon MONOPLANE](https://openairdocs.org/model/harmon-monoplane) (registry code 0560806) (OpenAirDocs)
- Registry engine: [Volkswagen CONVERSION](https://openairdocs.org/engine/volkswagen-conversion) (registry code 63501, reciprocating) (OpenAirDocs)
- Category: Airplane, amateur-built
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Grayson County

## 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 19741020035379A](https://openairdocs.org/incident/19741020035379A), Oct 20, 1974: Amtrbo ELGRINGO, Sherman, TX, Substantial damage

## Other investigations on N7UN (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 FTW79DPD03](https://openairdocs.org/ntsb/FTW79DPD03), Oct 15, 1978: Harmon 1 (N7UN), Gainesville, TX, substantial damage

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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