# NTSB OAK73AP009: Boeing 727, N7035U, S.Francisco, CA, October 1, 1972

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: October 1, 1972
- Place: S.Francisco, CA · S.FRANCISCO, CA
- Location: 37.7750° N, 122.4194° W: Placed by OpenAirDocs: center of San Francisco, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.7750&lon=-122.4194&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 9 minor, 88 uninjured
- Status: Completed, report April 5, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 168664
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK73AP009
- Page: https://openairdocs.org/ntsb/OAK73AP009

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0044   72/10/1   S.FRANCISCO,CALIF   BOEING 727          CR-  0  0  6  SCHED DOM PASSG SRV       ATP,FLIGHT INSTR., AGE
        TIME - 0830                    N7035U              PX-  0  0 91                            50, 21378 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            4795 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - SAN FRANCISCO INT
        OPERATOR - UNITED AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          BOISE,ID                    LOS ANGELES,CALIF            S.FRANCISCO,CALIF
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GEAR COLLAPSED                                           LANDING: ROLL
           COLLIDED WITH: BUILDING(S)                               LANDING: ROLL
        PROBABLE CAUSE(S)
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: SUBSTANDARD QUALITY CONTROL
           AIRFRAME - LANDING GEAR: NORMAL RETRACTION/EXTENSION ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  FALSE FIRE WARNING
        REMARKS- STRESS CORROSION,FRNT TRUNNION BRG SUPPORT FITTING.PRE-EXISTING CRACKS PRODUCED DRG REWORK.
```

## Aircraft

- Registration: [N7035U](https://openairdocs.org/deregistered/N7035U-1983-03-14), registration cancelled 1983-03-14, S/N 18327 (OpenAirDocs)
- Reported make and model: BOEING 727
- Registry model: [Boeing 727](https://openairdocs.org/model/boeing-727) (registry code 1384001) (OpenAirDocs)
- Category: Airplane
- Engines: turbo fan
- Damage: Substantial damage
- Airport: San Francisco Int

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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