What was found
ON THE 28TH OF JUNE 2022 THE L/H FLAP LIMIT SWITCH ASSY I.A.W. AMM 27-50-05 WAS CHANGED AT THE A/C D-CADA. THE ORDERED SWITCH ASSY WAS ACCOMPANIED WITH AN FAA FORM 8130-3 STATUS NEW, WHICH WAS ISSUED BY LEARJET INC ON THE 08/03/2020. THE SWITCH WAS ADJUSTED I.A.W. AMM 27-50-05 AND AFTERWARDS, A FUNCTIONAL TEST OF THE FLAP SYSTEM WAS PERFORMED I.A.W. AMM 27-50-00. ALL WORK WAS SUCCESSFULLY COMPLETED WITHOUT ANY COMPLAINTS AND THE AIRCRAFT WAS RELEASED TO SERVICE ON THE 28.06.2022. HE CREW RECEIVED A T/O-WARNING DURING T/O-ROLL (FLAPS 8‘). THE T/O WAS ABORTED AT LOW SPEED (APPROXIMATELY 40KT). THE FLIGHT WAS CANCELLED, AND A TECHLOG ENTRY WAS MADE (SEE ALSO OPS OCCURRENCE REPORT #256). THE AIRCRAFT WAS RETURNED TO THE MAINTENANCE HANGAR FOR TROUBLESHOOTING. DURING THE TROUBLESHOOTING, A WIRING CHECK WAS PERFORMED DURING WHICH THE CONTINUITY WAS MEASURED ON J1071 BETWEEN PIN 4 AND PIN 5 IN THE FLAPS FULL DOWN POSITION. AT THIS POINT, NO CONTINUITY WAS MEASURED. DURING THE SUBSEQUENT CHECK OF THE WIRING OF THE L/H FLAP SWITCH, IT WAS FOUND THAT THE CABLE DESIGNATION FOR NO. 1 (C) & NO. 2 (NO) WERE MIXED UP AND THEREFORE THE TWO CABLES WERE CONNECTED THE WRONG WAY ROUND DURING INSTALLATION. THE REASON FOR THE ABORTED TAKE-OFF WAS THE INCORRECTLY CONNECTED SWITCH S53 DUE TO THE INCORRECT LABELING OF THE CABLES FROM THE MANUFACTURER.