# NTSB DEN72AD001: Boeing 727, N7020U, Denver, CO, July 19, 1971

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: July 19, 1971
- 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: Minor injuries
- Injuries: 8 minor, 93 uninjured
- Status: Completed, report December 22, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 161216
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN72AD001
- Page: https://openairdocs.org/ntsb/DEN72AD001

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0015  71/7/19    DENVER,COLO         BOEING 727          CR-  0  0  6  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 0936                    N7020U              PX-  0  0 95                            43, 10500 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            1694 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - STAPLETON
        OPERATOR - UNITED AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          PHILADELPHIA,PA             SAN FRANCISCO,CALIF          DENVER,COLO
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GROUND-WATER LOOP-SWERVE                                 LANDING: ROLL
           GEAR COLLAPSED                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO FOLLOW APPROVED PROCEDURES,DIRECTIVES,ETC.
           PILOT IN COMMAND - MISJUDGED SPEED
           PILOT IN COMMAND - IMPROPER OPERATION OF BRAKES AND/OR FLIGHT CONTROLS
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
           SYSTEMS - ELECTRICAL SYSTEM: SWITCHES
           MISCELLANEOUS ACTS,CONDITIONS - OVERHEATED
           AIRPORTS/AIRWAYS/FACILITIES - AIRPORT CONDITIONS: WET RUNWAY
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  SUSPECTED MECHANICAL DISCREPANCY
        REMARKS- BOOST PUMP SWITCHES OVHTD.CREW MISTOOK SOURCE OF ODOR.TOOK WRONG ACTIONS.LND TOO FAST FOR RWY COND
```

## Aircraft

- Registration: [N7020U](https://openairdocs.org/deregistered/N7020U-1993-04-21), registration cancelled 1993-04-21, S/N 18312 (OpenAirDocs)
- Reported make and model: BOEING 727
- Registry model: [Boeing 727-22](https://openairdocs.org/model/boeing-727-22) (registry code 1384002) (OpenAirDocs)
- Category: Airplane
- Engines: turbo fan
- Damage: Substantial damage
- Airport: Stapleton

## Other investigations on N7020U (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 OAK66I0047](https://openairdocs.org/ntsb/OAK66I0047), Apr 20, 1966: Boeing 727-22 (N7020U), Sacramento, CA, incident, minor 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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