# NTSB CHI82FEE03: Sonerai II, N66LS, Romeoville, IL, October 20, 1981

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: October 20, 1981
- Place: Romeoville, IL · ROMEOVILLE, IL
- Location: 41.6278° N, 88.1012° W: Placed by OpenAirDocs: center of Romeoville, IL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.6278&lon=-88.1012&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report January 19, 1982
- Report: Brief approved by the director
- NTSB case key (mKey): 123485
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI82FEE03
- Page: https://openairdocs.org/ntsb/CHI82FEE03

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2969  81/10/20   ROMEOVILLE,IL       SONERAI II          CR-  1  0  0  NONCOMMERCIAL             COMMERCIAL, AGE 23, 824
        TIME - 0935                    N66LS               PX-  0  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 50 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - LEWES-LOCKPORT
        DEPARTURE POINT             INTENDED DESTINATION
          ROMEOVILLE,IL               HAMPSHIRE,IL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              TAKEOFF: INITIAL CLIMB
        PROBABLE CAUSE(S)
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: SUBSTANDARD QUALITY CONTROL
           AIRFRAME - FLIGHT CONTROL SURFACES: AILERON SURFACES,ATTACHMENTS
           MISCELLANEOUS ACTS,CONDITIONS - WRONG PART
           MISCELLANEOUS ACTS,CONDITIONS - FLUTTER
        FACTOR(S)
           AIRFRAME - WINGS: SPARS
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        REMARKS- AILERON COUNTERWEIGHT RIBS FD CONSIDERABLY BELOW HARDNESS STANDARDS FOR 2024TS ALUMINUM.
```

## Aircraft

- Registration: [N66LS](https://openairdocs.org/deregistered/N66LS-2012-10-10), registration cancelled 2012-10-10, S/N 6, built 1975 (OpenAirDocs)
- Reported make and model: SONERAI II
- Registry model: [Yarger SONERIA 2](https://openairdocs.org/model/yarger-soneria-2) (registry code 0565913) (OpenAirDocs)
- Registry engine: [Volkswagen CONVERSION](https://openairdocs.org/engine/volkswagen-conversion) (registry code 63501, reciprocating) (OpenAirDocs)
- Category: Airplane, amateur-built
- Engines: reciprocating
- Damage: Destroyed
- Airport: Lewes-Lockport

## 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 19811020069019A](https://openairdocs.org/incident/19811020069019A), Oct 20, 1981: Amtrmo SONERAI2, Romeoville, IL, Destroyed. Indicates loss of aileron counterweights, roll, then wing seperation. Pilot ejected, failed to open parachute.

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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