# NTSB OAK73IP020: Sikorsky S-61N, N4606G, Oakland, CA, November 17, 1973

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: November 17, 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: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 20 uninjured
- Status: Completed, report January 24, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 187732
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK73IP020
- Page: https://openairdocs.org/ntsb/OAK73IP020

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0026  73/11/17   OAKLAND,CALIF       SIKORSKY S-61N      CR-  0  0  3  SCHED DOM PASSG SRV       CERTIFICATE UNKNOWN, AGE
        TIME - 0758                    N4606G              PX-  0  0 17                            UNK/NR, UNK/NR TOTAL
                                       DAMAGE-MINOR        OT-  0  0  0                            HOURS, UNK/NR IN TYPE,
                                                                                                   UNK/NR INSTRUMENT RATED.
        CLASSIFIED AS INCIDENT
        NAME OF AIRPORT - OAKLAND INTL
        OPERATOR - SAN FRANCISCO AND OAKLAND HELICOPTER AIRLINES
        DEPARTURE POINT             INTENDED DESTINATION
          OAKLAND,CALIF               SAN FRANCISCO,CALIF
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GEAR RETRACTED                                           STATIC: OTHER
        PROBABLE CAUSE(S)
           SYSTEMS - ELECTRICAL SYSTEM: RELAYS AND WIRING
           MISCELLANEOUS ACTS,CONDITIONS - CORRODED/CORROSION
        REMARKS- TKOF RPM,JUST PRIOR LIFT-OFF.ELECT HARNESS P/N S6155-63093-6 SHRTD,ENERGIZED MLG PUMP MOTOR RELAY.
```

## Aircraft

- Registration: [N4606G](https://openairdocs.org/deregistered/N4606G-1976-12-29), registration cancelled 1976-12-29, S/N 61224 (OpenAirDocs)
- Reported make and model: SIKORSKY S-61N
- Registry model: [Sikorsky S-61N](https://openairdocs.org/model/sikorsky-s-61n) (registry code 8142104) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- Damage: Minor damage
- Airport: Oakland Intl

## Other investigations on N4606G (2)

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 OAK67A0043](https://openairdocs.org/ntsb/OAK67A0043), Oct 11, 1966: Sikorsky S-61N (N4606G), Mountain View, CA, substantial damage
- [NTSB OAK66A0054](https://openairdocs.org/ntsb/OAK66A0054), Jun 6, 1966: Sikorsky S-61N (N4606G), San Francisco, 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.

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