# NTSB IAD71II039: Boeing 727, N7644U, Dulles Int Apt, DC, February 15, 1971

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: February 15, 1971
- Place: Dulles Int Apt, DC · DULLES INT APT, DC
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 62 uninjured
- Status: Completed, report July 13, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 161313
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=IAD71II039
- Page: https://openairdocs.org/ntsb/IAD71II039

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0023  71/2/15    DULLES INT APT,DC   BOEING 727          CR-  0  0  6  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 0830                    N7644U              PX-  0  0 56                            49, 19414 TOTAL HOURS,
                                       DAMAGE-NONE         OT-  0  0  0                            1011 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        CLASSIFIED AS INCIDENT
        NAME OF AIRPORT - DULLES INT APT
        OPERATOR - UNITED AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          BUFFALO,NY                  ATLANTA,GA
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           MISCELLANEOUS                                            IN FLIGHT: CLIMB TO CRUISE
        PROBABLE CAUSE(S)
           SYSTEMS - FLIGHT CONTROL SYSTEMS: WING FLAP CONTROL SYSTEM HYDRAULIC
           MISCELLANEOUS ACTS,CONDITIONS - STUCK
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  SUSPECTED MECHANICAL DISCREPANCY
        REMARKS- OUTBD TRAILING EDGE FLAPS STUCK AT 2 DEG DUE FAULTY INDICATOR. ACFT WAS DIVERTED TO DULLES,LND OK.
```

## Aircraft

- Registration: [N7644U](https://openairdocs.org/deregistered/N7644U-2017-06-15), registration cancelled 2017-06-15, S/N 20038, built 1969 (OpenAirDocs)
- Reported make and model: BOEING 727
- Registry model: [Boeing 727-222](https://openairdocs.org/model/boeing-727-222) (registry code 1384073) (OpenAirDocs)
- Registry engine: [Pratt & Whitney JT8D-5](https://openairdocs.org/engine/pratt-whitney-jt8d-5) (registry code 52046, turbo-jet) (OpenAirDocs)
- Category: Airplane
- Engines: turbo fan
- Damage: No damage
- Airport: Dulles Int Apt

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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