A319 Technician reported incorrect trouble shooting and recording of data led to an engine failure on take-off. Communications between maintenance and engineering caused critical engine data to not be reviewed and reported to appropriate personnel; allowing the engine to remain in service without proper inspections and maintenance action.

Narrative

Aircraft X had an engine failure that could have been prevented. An vibration was observed by the flight crew which went onto monitor as a result. When set down into ZZZ for troubleshooting; the item was rewritten back up but at a higher vibration amount than when it was placed on monitor. Engineering reviewed the data and determined that it was an indication issue and had the incorrect Technical Service Manual (TSM) procedure dictated to be done and regardless replace a vibration sensor; versus the correct TSM procedure. This dictation by engineering with maintenance lead to local maintenance to use the incorrect TSM at their request. The engine was placed back into service with just an idle run and nobody questioned to have a vibration survey completed to inspect for correction. The aircraft was dispatched with every flight afterwards reaching high vibrations and being signed off even though the indicated level was above the authority limit. Maintenance never issued a maintenance discrepancy to keep the aircraft at maintenance bases and the aircraft was flown to ZZZZ over water to its failure on departure from that station.The Company had created a culture where engineering will determine what needs to be done and cause deviations in correct and effective troubleshooting while maintenance will not challenge nor will the technicians involved. This adds to the reasons as to why the company has had a high engine fail rate. The propulsion engineers willfully dictate what needs to be done and it creates these deviations on required troubleshooting by licensed mechanics. There is too much office troubleshooting being accomplished without actually relying on correct or effective troubleshooting and it has created a motive to replace parts until the item is fixed. The company needs to stop relying on engineering as the main source of troubleshooting as this creates deviations plus actions placed into the web based system that are not the correct way to troubleshoot nor repair aircraft. Engineering is abusing technicians A&Ps and the company willfully knows it. This type of culture needs to be corrected and halted as well as place the technicians back in control of their licenses and not engineers who are allowed to not create Engineering Authorizations (EAs) for accountability.