# NTSB OAK66A0054: Sikorsky S-61N, N4606G, San Francisco, CA, June 6, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 6, 1966
- Place: San Francisco, CA · SAN 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: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 8 uninjured
- Status: Completed, report October 21, 1966
- Report: Brief approved by the director
- NTSB case key (mKey): 171451
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK66A0054
- Page: https://openairdocs.org/ntsb/OAK66A0054

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0023   66/6/6    SAN FRANCISCO CAL   SIKORSKY S-61N      CR-  0  0  3  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 1355                    N4606G              PX-  0  0  5                            28, 2070 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            1255 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - SAN FRANCISCO INT
        OPERATOR - SAN FRANCISCO AND OAKLAND HELICOPTER AIRLINES
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLIDED WITH: BUILDING(S)                               TAXI: GROUND TAXI, OTHER
        PROBABLE CAUSE(S)
           COPILOT - MISJUDGED CLEARANCE
           PILOT IN COMMAND - INADEQUATE SUPERVISION OF FLIGHT
        REMARKS- STRUCK TWA JETWAY GATE.DEBRIS DAMAGED 2 TWA BOEING 707S, 1 SFO SIKORSKY S-61.
```

## 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: Substantial damage
- Airport: San Francisco Int

## 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 OAK73IP020](https://openairdocs.org/ntsb/OAK73IP020), Nov 17, 1973: Sikorsky S-61N (N4606G), Oakland, CA, incident, minor damage
- [NTSB OAK67A0043](https://openairdocs.org/ntsb/OAK67A0043), Oct 11, 1966: Sikorsky S-61N (N4606G), Mountain View, 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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