# NTSB DCA71AZ004: Martin 404, N464M, Silver Plume, CO, October 2, 1970

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: October 2, 1970
- Place: Silver Plume, CO · SILVER PLUME, CO
- Location: 39.6954° N, 105.7270° W: Placed by OpenAirDocs: center of Silver Plume, CO, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.6954&lon=-105.7270&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 30 fatal, 10 serious
- Status: Completed, report September 28, 1971
- Report: Brief approved by the director
- Safety recommendations: Yes
- NTSB case key (mKey): 79937
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DCA71AZ004
- Page: https://openairdocs.org/ntsb/DCA71AZ004

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1127   70/10/2 NR.SILVER PLUME,COLO  MARTIN 404          CR-  2  1  0  COMMERCIAL                AIRLINE TRANSPORT, AGE
        TIME - 1200                    N464M               PX- 28  9  0  CTR PASSG-D               27, 2452 TOTAL HOURS, 123
                                       DAMAGE-DESTROYED    OT-  0  0  0                            IN TYPE, INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          WICHITA,KANS                LOGAN,UT                     DENVER,COLO
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           STALL: MUSH                                              IN FLIGHT: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER IN-FLIGHT DECISIONS OR PLANNING
        FACTOR(S)
           TERRAIN - HIGH OBSTRUCTIONS
           PILOT IN COMMAND - INADEQUATE PREFLIGHT PREPARATION AND/OR PLANNING
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY LOADED AIRCRAFT-WEIGHT-AND/OR C.G.
           PILOT IN COMMAND - FAILED TO FOLLOW APPROVED PROCEDURES,DIRECTIVES,ETC.
           PERSONNEL - OPERATIONAL SUPERVISORY PERSONNEL: INADEQUATE SUPERVISION OF FLIGHT CREW
           WEATHER - HIGH DENSITY ALTITUDE
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        WEATHER FORECAST - FORECAST SUBSTANTIALLY CORRECT
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          NONE                                                      60
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          350                                                       10
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
         FIRE AFTER IMPACT
        REMARKS- INTNTL OPERATION OF ACFT OVER MTN VALLEY AT ALT TOO LOW FOR SAFE CLIMBOUT OR CRSE REVERSAL.
```

## Aircraft

- Registration: [N464M](https://openairdocs.org/deregistered/N464M-1970-11-16), registration cancelled 1970-11-16, S/N 14151, built 1952 (OpenAirDocs)
- Reported make and model: MARTIN 404
- Registry model: [Martin 404](https://openairdocs.org/model/martin-404) (registry code 5450702) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

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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