# NTSB UNK64X0628: Curtis C-46A, N611Z, Denver, CO, February 21, 1964

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: February 21, 1964
- 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: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report December 15, 1964
- Report: Brief approved by the director
- NTSB case key (mKey): 114065
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=UNK64X0628
- Page: https://openairdocs.org/ntsb/UNK64X0628

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0011  64/2/21    DENVER COLO         CURTIS C-46A        CR-  0  0  3  MILITARY CTR CARGO DOM    AIRLINE TRANSPORT, AGE
        TIME - 1853                    N611Z               PX-  0  0  0                            35, 7547 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            3538 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - LOWRY FIELD
        OPERATOR - ZANTOP AIR TRANSPORT
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GEAR RETRACTED                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO EXTEND LANDING GEAR
           PILOT IN COMMAND - LACK OF FAMILIARITY WITH AIRCRAFT
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPER EMERGENCY PROCEDURES
           AIRFRAME - LANDING GEAR: NORMAL RETRACTION/EXTENSION ASSEMBLY
           SYSTEMS - HYDRAULIC SYSTEM: RESERVOIR,LINES,FITTINGS
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        REMARKS- RIGHT ENGINE HYDRAULIC PRESSURE LINE
```

## Aircraft

- Registration: [N611Z](https://openairdocs.org/deregistered/N611Z-2013-02-01), registration cancelled 2013-02-01, S/N 398CK, built 1955 (OpenAirDocs)
- Reported make and model: CURTIS C-46A
- Registry model: [Curtiss Wright C-46A](https://openairdocs.org/model/curtiss-wright-c-46a) (registry code 2622602) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R-2800 series](https://openairdocs.org/engine/pratt-whitney-r-2800-series) (registry code 52026, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Lowry Field

## Other investigations on N611Z (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 MIA74AM037](https://openairdocs.org/ntsb/MIA74AM037), Oct 23, 1973: Curtis-Wrt C-46A (N611Z), Lakeland, FL, substantial damage
- [NTSB UNK65X0828](https://openairdocs.org/ntsb/UNK65X0828), Nov 25, 1964: Curtiss C-46 (N611Z), Covington, KY, 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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