# NTSB OAK71IP009: Boeing 747, N4703U, Sacramento, CA, August 15, 1970

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: August 15, 1970
- Place: Sacramento, CA · SACRAMENTO, CA
- Location: 38.5816° N, 121.4944° W: Placed by OpenAirDocs: center of Sacramento, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=38.5816&lon=-121.4944&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 8 uninjured
- Status: Completed, report July 21, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 108095
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK71IP009
- Page: https://openairdocs.org/ntsb/OAK71IP009

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0077  70/8/15    SACRAMENTO,CALIF    BOEING 747          CR-  0  0  8  TRAINING                  AIRLINE TRANSPORT, AGE
        TIME - 1148                    N4703U              PX-  0  0  0                            57, 22800 TOTAL HOURS, 40
                                       DAMAGE-MINOR        OT-  0  0  0                            IN TYPE, INSTRUMENT
                                                                                                   RATED.
        CLASSIFIED AS INCIDENT
        NAME OF AIRPORT - SACRAMENTO METRO
        OPERATOR - UNITED AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          SAN FRANCISCO,CALIF         RETURN                       SACRAMENTO,CALIF
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           OVERSHOOT                                                TAKEOFF: ABORTED
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - DELAYED ACTION IN ABORTING TAKEOFF
           MISCELLANEOUS ACTS,CONDITIONS - ASYMETRICAL FLAPS
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: OTHER
           SYSTEMS - HYDRAULIC SYSTEM: BY-PASS VALVE
           MISCELLANEOUS ACTS,CONDITIONS - HYDRAULIC FAILURE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - TOUCH AND GO LANDING
        REMARKS- INBRD TE FLAPS 25DEG,OUTBRD 10DEG,LE DEVICES EXTDD.BOEING VALVE NR 60B00244-1 INSTLD-NO FLT CLNCE.
```

## Aircraft

- Registration: N4703U (not matched to a registry record)
- Reported make and model: BOEING 747
- Category: Airplane
- Engines: turbo fan
- Damage: Minor damage
- Airport: Sacramento Metro

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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