A DASSAULT FALCON-20F AD 2002-14-19 AFFECTING ROCKWELL COLLINS ADC-85 AIR DATA COMPUTER (ADC) WAS NEVER COMPLIED WITH.

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AIRWORTHINESS DIRECTIVE 2002-14-19 AFFECTING ROCKWELL COLLINS ADC -85 UNITS WAS NEVER COMPLIED WITH. THE AIRWORTHINESS DIRECTIVE NOTE WAS MISSED ALL THESE YRS BY OUR IN-HOUSE MAINT DEPT. WHEN YOU READ THE REASON FOR THE AIRWORTHINESS DIRECTIVE (SEE BELOW) IT IS NOT VERY REASSURING; AS A CREW MEMBER; AS TO THE AIRWORTHINESS OF THE ACFT. OUR LCL FAA FSDO SEEMS TO IGNORE ANY IN-DEPTH INSPECTIONS OF OUR REPAIR STATION. THE ONLY REASON THIS AIRWORTHINESS DIRECTIVE WAS DISCOVERED IS WE HAVE A COMPLETE CHANGE OF MAINT STAFF AND THEY ARE IN THE PROCESS OF A COMPLETE REVIEW OF ALL ACFT PAPERWORK. FROM AIRWORTHINESS DIRECTIVE 2002-14-19 SUPPLEMENTARY INFO: DISCUSSION: WHAT EVENTS HAVE CAUSED THIS AIRWORTHINESS DIRECTIVE? THE ADC; AS PART OF ITS MONITORING PROCESS; TESTS FOR ERRANT SENSOR BEHAVIOR SUCH AS UNREASONABLE JUMPS IN ALT AND UNREASONABLY HIGH VERT SPD. WHEN THE ADC DETECTS AN ERRANT SENSOR BEHAVIOR; THE ADC DISPLAYS A FLAG FOR 5.5 SECONDS; PLUS THE TIME IT TAKES FOR THE SENSOR TO SETTLE WITHIN THE LIMITS FOR ANOTHER 5.5-SECOND PERIOD. THIS RESULTS IN A MINIMUM ADC FLAG DISPLAY OF 11 SECONDS. TESTING OF CERTAIN ROCKWELL COLLINS ADC'S REVEALS THE ADC COULD DISPLAY UNWARRANTED FLAGS ON ACFT WHERE YOU CAN SELECT THE 'NORMAL/ALTERNATE AIR' STATIC SOURCE. WHEN THERE IS A SIGNIFICANT DIFFERENCE BTWN NORMAL AND ALTERNATE/REVISIONARY STATIC AIR SOURCES; YOU CAN EXCEED THE ADC MONITOR THRESHOLDS AND THE ADC WOULD DISPLAY FLAGS. IF THE FLT CREW USED THE UNDESIRABLE ADC FLAG DISPLAYS TO DESELECT THE ALTERNATE STATIC AIR SOURCE BEFORE THE INITIAL 11-SECOND DISPLAY PERIOD; A VALID AIR SOURCE MAY HAVE BEEN DESELECTED. CONFUSION COULD RESULT WHEN THE PREVIOUSLY UNFLAGGED NORMAL STATIC AIR SOURCE IS RESELECTED. THIS MAY ALSO RESULT IN THE ADS DISPLAYING A FLAG FOR THE FIRST 11 SECONDS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATES HIS COMPANY HAD NOT COMPLIED WITH THE A.D. 2002-14-19 WHEN ISSUED BY THE FAA IN 2002. THE A.D. WAS TO ADDRESS THE UNWARRANTED DISPLAY FLAGS THAT COULD OCCUR ON SOME ACFT WITH ROCKWELL COLLINS ADC-85 (AIR DATA COMPUTER); WHERE YOU CAN SELECT THE 'NORMAL/ALTERNATE AIR' STATIC SOURCE. PREVIOUSLY; PILOTS HAD GONE TO SENIOR MANAGEMENT ABOUT THEIR CONCERNS AS PIC'S (PILOT IN COMMAND) REGARDING MAINT PRACTICES NOT ASSOCIATED WITH THIS A.D. WITH THE NORMAL RETIREMENT OF THEIR MAINT MANAGER; A NEW CHIEF OF MAINT WAS HIRED AND THIS PERSON INITIATED A COMPLETE REVIEW OF THEIR ACFT PAPERWORK; FINDING NUMEROUS ISSUES OF NON-COMPLIANCE OF AIRWORTHINESS DIRECTIVES ISSUED; INSPECTIONS; AND MAINT NOT COMPLIED WITH.