# NTSB DEN74AD059: Dehavilland DHC-6, N23RM, Denver, CO, June 28, 1974

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 28, 1974
- Place: Denver, CO · DENVER, CO
- Location: 39.7392° N, 104.9847° W: Placed by OpenAirDocs: center of Denver, CO, within about 7 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.7392&lon=-104.9847&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 13 uninjured
- Status: Completed, report September 16, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 130228
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN74AD059
- Page: https://openairdocs.org/ntsb/DEN74AD059

## NTSB brief (aircraft 2)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2272  74/6/28    DENVER,COLO         BEECH V35B          CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, AGE 40, 242
        TIME - 1306                    N8105R              PX-  0  0  0  BUSINESS                  TOTAL HOURS, 86 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0 12                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - STAPLETON INTL
        DEPARTURE POINT             INTENDED DESTINATION
          AMARILLO,TEX                DENVER,COLO
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  LANDING: TRAFFIC PATTERN-CIRCLING
        PROBABLE CAUSE(S)
           PERSONNEL - TRAFFIC CONTROL PERSONNEL: INADEQUATE SPACING OF AIRCRAFT
           PERSONNEL - MISCELLANEOUS-PERSONNEL: PILOT OF OTHER AIRCRAFT
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OTHER AIRCRAFT
           PILOT IN COMMAND - FAILED TO FOLLOW APPROVED PROCEDURES,DIRECTIVES,ETC.
        FACTOR(S)
           PERSONNEL - TRAFFIC CONTROL PERSONNEL: OTHER
         SPECIAL DATA
          SEGMENTS OF AVIATION INVOLVED - SMALL US GEN.AV.-SMALL US GEN.AV.
          CONTROLLING AGENCY - LOCAL CONTROL                       RADAR CTL/SURVEILLANCE - UNDER RADAR CONTACT
          TRAFFIC ADVISORY ISSUED - BY LOCAL CONTROL               CONTROLLED/UNCONTROLLED AIRPORT - CONTROLLED AIRPORT
          CONTROL ZONE/AREA - YES                                  CONVERGENCE ANGLE-DEGREES -  53
          HORIZONTAL COLLISION ANGLE-DEGREES -   45                EVASIVE ACTION TAKEN - NO
          ANTI-COLLISION LIGHTS - INSTALLED,OPERATION UNKNOWN
        REMARKS- CLRD DNWND,#3 TO LND BEHIND OTTER.TURNED BASE,ADVISED TRAFFIC IN SIGHT.COLLISION TURNING TO FINAL.
```

## NTSB brief (aircraft 1)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2272  74/6/28    DENVER,COLO         DEHAVILLAND DHC-6   CR-  0  0  2  COMMERCIAL                AIRLINE TRANSPORT, AGE
        TIME - 1306                    N23RM               PX-  0  0 10  COMMUTER AIR CARRIER      30, 4565 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  1  AIR TAXI-PASSG S-D        1393 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - STAPLETON INTL
        DEPARTURE POINT             INTENDED DESTINATION
          STEAMBOAT SPGS,COLO         DENVER,COLO
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  LANDING: FINAL APPROACH
        PROBABLE CAUSE(S)
           PERSONNEL - TRAFFIC CONTROL PERSONNEL: INADEQUATE SPACING OF AIRCRAFT
           PERSONNEL - MISCELLANEOUS-PERSONNEL: PILOT OF OTHER AIRCRAFT
           PILOT IN COMMAND - INADEQUATE SUPERVISION OF FLIGHT
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OTHER AIRCRAFT
        FACTOR(S)
           PERSONNEL - TRAFFIC CONTROL PERSONNEL: OTHER
         SPECIAL DATA
          SEGMENTS OF AVIATION INVOLVED - SMALL US GEN.AV.-SMALL US GEN.AV.
          CONTROLLING AGENCY - LOCAL CONTROL                       RADAR CTL/SURVEILLANCE - UNDER RADAR CONTACT
          TRAFFIC ADVISORY ISSUED - NONE                           CONTROLLED/UNCONTROLLED AIRPORT - CONTROLLED AIRPORT
          CONTROL ZONE/AREA - YES                                  CONVERGENCE ANGLE-DEGREES -  53
          HORIZONTAL COLLISION ANGLE-DEGREES -   82                EVASIVE ACTION TAKEN - YES
          ANTI-COLLISION LIGHTS - INSTALLED,OPERATION UNKNOWN
        REMARKS- STRAIGHT-IN RWY 8L,CLRD #2 TO LND.ATC PERS FAILED TO USE AVAIL BRITE DISPLAY TO EFFECT SEPN.
```

## Aircraft 1

- Registration: N23RM (not matched to a registry record)
- Reported make and model: DEHAVILLAND DHC-6
- Category: Airplane
- Engines: turbo prop
- Damage: Substantial damage
- Airport: Stapleton Intl

## Aircraft 2

- Registration: [N8105R](https://openairdocs.org/aircraft/N8105R), registered now, S/N D-9089, built 1969 (OpenAirDocs)
- Reported make and model: BEECH V35B
- Registry model: [Beech V35B](https://openairdocs.org/model/beech-v35b) (registry code 1151548) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Stapleton Intl

## FAA reports on this event (2)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19740628022492A](https://openairdocs.org/incident/19740628022492A), Jun 28, 1974: Dhav DHC6*, Denver, CO, Substantial damage. Straight-in rwy 8L,clrd #2 to lnd.ATC pers failed to use avail brite display to effect sepn.
- [Accident 19740628022491A](https://openairdocs.org/incident/19740628022491A), Jun 28, 1974: Beech V35B, Denver, CO, Substantial damage. Clrd dnwnd,#3 to lnd behind otter. Turned base,advised traffic in sight. Collision turning to final.

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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