# NTSB DEN74DTE72: Maule M4, N40354, Boulder, CO, May 19, 1974

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: May 19, 1974
- Place: Boulder, CO · BOULDER, CO
- Location: 40.0244° N, 105.2513° W: Placed by OpenAirDocs: center of Boulder, CO, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=40.0244&lon=-105.2513&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report June 17, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 124318
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN74DTE72
- Page: https://openairdocs.org/ntsb/DEN74DTE72

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1204  74/5/19    BOULDER,COLO        MAULE M4            CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 44, 104
        TIME - 0800                    N40354              PX-  0  0  3  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 35 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - BOULDER MUNI
        DEPARTURE POINT             INTENDED DESTINATION
          BOULDER,COLO                LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GROUND-WATER LOOP-SWERVE                                 LANDING: ROLL
           COLLIDED WITH: DITCHES                                   LANDING: ROLL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF BRAKES AND/OR FLIGHT CONTROLS
           PILOT IN COMMAND - FAILED TO MAINTAIN DIRECTIONAL CONTROL
        FACTOR(S)
           AIRPORTS/AIRWAYS/FACILITIES - AIRPORT CONDITIONS: OTHER
        REMARKS- ACFT RAN OFF RNWY,HIT DITCH.WINDS LGT-VAR
```

## Aircraft

- Registration: [N40354](https://openairdocs.org/aircraft/N40354), registered now, S/N 2132C, built 1972 (OpenAirDocs)
- Reported make and model: MAULE M4
- Registry model: [Maule M-4-220C](https://openairdocs.org/model/maule-m-4-220c) (registry code 5460114) (OpenAirDocs)
- Registry engine: [Franklin 6V 350 series](https://openairdocs.org/engine/franklin-6v-350-series) (registry code 27043, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Boulder Muni

## 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 19740519013199A](https://openairdocs.org/incident/19740519013199A), May 19, 1974: Maule M4220C, Boulder, CO, Substantial damage. Acft ran off rnwy,hit ditch. Winds lgt-var

## Other investigations on N40354 (2)

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 CHI97LA258](https://openairdocs.org/ntsb/CHI97LA258), Aug 1, 1997: Maule M-4-220C (N40354), Bemidgi, MN, substantial damage. Probable cause: the pilot's failure or inability to maintain directional control of the airplane, as a result of an undetermined anomaly concerning of the right main landing gear brake.
- [NTSB NYC87LA182](https://openairdocs.org/ntsb/NYC87LA182), Jun 20, 1987: Maule M-4 (N40354), Wellsville, NY, 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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