# NTSB OAK74AP015: Hughes 269C, N9628F, Oakland, CA, October 2, 1973

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: October 2, 1973
- Place: Oakland, CA · OAKLAND, CA
- Location: 37.8044° N, 122.2708° W: Placed by OpenAirDocs: center of Oakland, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.8044&lon=-122.2708&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed, report March 20, 1974
- Report: Brief approved by the director
- Safety recommendations: Yes
- NTSB case key (mKey): 79872
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK74AP015
- Page: https://openairdocs.org/ntsb/OAK74AP015

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3942   73/10/2   OAKLAND,CALIF       HUGHES 269C         CR-  2  0  0  MISCELLANEOUS             COMMERCIAL, FL.INSTR.,
        TIME - 2039                    N9628F              PX-  0  0  0  POLICE PATROL             AGE 47, 4326 TOTAL HOURS,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            1800 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          OAKLAND,CALIF               LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: MAIN ROTOR                      IN FLIGHT: NORMAL CRUISE
           COLLIDED WITH: BUILDING(S)                               LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: MAIN ROTOR DRIVE SHAFT
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
        FACTOR(S)
           TERRAIN - HIGH OBSTRUCTIONS
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         FIRE AFTER IMPACT
        REMARKS- M/R GR DRIVE SHAFT FAILED. HIT CONDUIT PIPE & PATIO ROOF.CRASHED IN YARD.
```

## Aircraft

- Registration: [N9628F](https://openairdocs.org/deregistered/N9628F-1974-04-24), registration cancelled 1974-04-24, S/N 900037, built 1970 (OpenAirDocs)
- Reported make and model: HUGHES 269C
- Registry model: [Hughes 269C](https://openairdocs.org/model/hughes-269c) (registry code 4470504) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Destroyed

## Other investigations on N9628F (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 OAK72DVD49](https://openairdocs.org/ntsb/OAK72DVD49), May 31, 1972: Hughes 300C (N9628F), Oakland, CA, substantial 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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.