# NTSB SEA72IS008: Boeing 747, N606US, Seattle, WA, September 2, 1971

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: September 2, 1971
- Place: Seattle, WA · SEATTLE, WA
- Location: 47.6062° N, 122.3321° W: Placed by OpenAirDocs: center of Seattle, WA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=47.6062&lon=-122.3321&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 189 uninjured
- Status: Completed, report August 16, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 164569
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA72IS008
- Page: https://openairdocs.org/ntsb/SEA72IS008

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0041   71/9/2    SEATTLE,WASH        BOEING 747          CR-  0  0 12  SCHED INTERNATL PASSG SRV AIRLINE TRANSPORT, AGE
        TIME - 1855                    N606US              PX-  0  0177                            UNK/NR, UNK/NR TOTAL
                                       DAMAGE-MINOR        OT-  0  0  0                            HOURS, UNK/NR IN TYPE,
                                                                                                   INSTRUMENT RATED.
        CLASSIFIED AS INCIDENT
        NAME OF AIRPORT - SEATTLE-TACOMA
        OPERATOR - NORTHWEST AIRLINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          TOKYO,JAPAN                 SEATTLE,WASH
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           MISCELLANEOUS                                            LANDING: FINAL APPROACH
        PROBABLE CAUSE(S)
           SYSTEMS - FLIGHT CONTROL SYSTEMS: WING FLAP CONTROL SYSTEM HYDRAULIC
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY SECURED
           MISCELLANEOUS ACTS,CONDITIONS - ASYMETRICAL FLAPS
        REMARKS- 3 SCREWS AND SAFETY WIRE TO SECURE L FLAP DRIVE TORQUE TUBE TO NR 3 COUPLING MISSING,TIME UNDET.
```

## Aircraft

- Registration: N606US (not matched to a registry record)
- Reported make and model: BOEING 747
- Category: Airplane
- Engines: turbo fan
- Damage: Minor damage
- Airport: Seattle-Tacoma

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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