NTSB Identification: CHI82FEE03
14 CFR Part 91 General Aviation
Aircraft: SONERAI II, registration: N66LS

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 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
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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.

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