# NTSB CHI79FEE70: Scorpion TOO, N36JB, Rockford, IL, July 23, 1979

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 23, 1979
- Place: Rockford, IL · ROCKFORD, IL
- Location: 42.2711° N, 89.0940° W: Placed by OpenAirDocs: center of Rockford, IL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.2711&lon=-89.0940&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report April 29, 1980
- Report: Brief approved by the director
- NTSB case key (mKey): 133774
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI79FEE70
- Page: https://openairdocs.org/ntsb/CHI79FEE70

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3662  79/7/23    ROCKFORD,IL         SCORPION TOO        CR-  0  0  1  MISCELLANEOUS             COMMERCIAL, AGE 41, 402
        TIME - 1759                    N36JB               PX-  0  0  0  DEMONSTRATION             TOTAL HOURS, 71 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        NAME OF AIRPORT - SELFRIGE PARK
        DEPARTURE POINT             INTENDED DESTINATION
          ROCKFORD,IL                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: MAIN ROTOR                      TAKEOFF: VERTICAL
           COLLISION WITH GROUND/WATER: CONTROLLED                  LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: MAIN ROTOR PULLEYS,BELTS
           MISCELLANEOUS ACTS,CONDITIONS - VIBRATION,EXCESSIVE
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING ON AIRPORT/SEAPLANE BASE/HELIPT.
        REMARKS- 3 OF 8 ENG DRIVE BELTS FOUND TWISTED & NOT SEATED IN ENG DRIVE PULLEY.
```

## Aircraft

- Registration: [N36JB](https://openairdocs.org/deregistered/N36JB-1980-02-20), registration cancelled 1980-02-20, S/N 4927, built 1977 (OpenAirDocs)
- Reported make and model: SCORPION TOO
- Registry model: [Branch SCORPION TOO](https://openairdocs.org/model/branch-scorpion-too) (registry code 13025B7) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Selfrige Park

## 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 19790723041009A](https://openairdocs.org/incident/19790723041009A), Jul 23, 1979: Amtrrw SCORPION2, Rockford, IL, Substantial damage. Partial power loss engine vibration made hard landing. Found 3 twisted main drive belts.

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.