What was found
PROCESSING CENTER (P/N 2536-6) CONTROLS A MULTITUDE OF FUNCTIONS WITHIN THE AIRCRAFT, INCLUDING FLIGHT CONTROLS, PRESSURIZATION, FUEL, AND THE ENGINES THEMSELVES. IN THE LAST WEEK ALONE, HAVE SEEN TWO OCCURRENCES OF THE LEFT ACS FADEC CHANNEL B FAILING, CAUSING THE LOSS OF 429 DATA COMMUNICATIONS. THE LOSS OF COMMUNICATION MOST COMMONLY RESULTS IN THE LOSS OF CONTROL OF THE PRIMARY OUTFLOW VALVE AND A SERIES OF OTHER FAILURES, INCLUDING THE FAILURE OF THE STICK PUSHER. THE CAS MESSAGES WILL CONTINUE TO POPULATE, AND SYSTEMS WILL CEASE TO RESPOND. THE TWO MOST RECENT FAILURES FOLLOW A PATTERN WHICH WE HAVE SEEN PREVIOUSLY. EACH OF THE PREVIOUS INCIDENTS VIEWED BY ITSELF WOULD BE EVALUATED AS AN ISOLATED OCCURRENCE, BUT IT HAS BECOME CLEAR THAT A PATTERN IS FORMING. PREVIOUSLY REPORTED A CATASTROPHIC FAILURE OF SEVERAL FADEC CARDS. TO THE BEST OF OUR KNOWLEDGE THOSE FAILURES REMAIN UNRESOLVED.