# NTSB CHI75FEE56: Sikorsky S-55B, N90407, Chicago, IL, April 27, 1975

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: April 27, 1975
- Place: Chicago, IL · CHICAGO, IL
- Location: 41.8500° N, 87.6501° W: Placed by OpenAirDocs: center of Chicago, IL, within about 9 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.8500&lon=-87.6501&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report September 5, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 149229
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI75FEE56
- Page: https://openairdocs.org/ntsb/CHI75FEE56

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1954  75/4/27    CHICAGO,IL          SIKORSKY S-55B      CR-  0  0  1  MISCELLANEOUS             ATP,FLIGHT INSTR., AGE
        TIME - 0810                    N90407              PX-  0  0  0  OTHER                     49, 14218 TOTAL HOURS,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            700 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          HINSDALE,IL                 CHICAGO,IL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: MAIN ROTOR                      IN FLIGHT: HOVERING
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: CLUTCH ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - EXCESSIVE-WEAR/PLAY
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         FIRE AFTER IMPACT
        REMARKS- HOUSING(P/N S14-35-2208) BORE DIAM UP TO .0015 OVER HIGH LIMIT.
```

## Aircraft

- Registration: [N90407](https://openairdocs.org/deregistered/N90407-1975-09-03), registration cancelled 1975-09-03, S/N 137843 (OpenAirDocs)
- Reported make and model: SIKORSKY S-55B
- Registry model: [Sikorsky CH-19E](https://openairdocs.org/model/sikorsky-ch-19e) (registry code 8141616) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Destroyed

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19750427020999A](https://openairdocs.org/incident/19750427020999A), Apr 27, 1975: Orlhel CH19ESKRSKY, Chicago, IL, Destroyed. Housing(p/n S14-35-2208) bore diam up to .0015 over high limit.

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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