B767-300 and 300 ER
Maintenance Airframe; Maintenance Inspection Authority; Maintenance Powerplant
Maintenance Inspector 6; Maintenance Lead Technician 6; Maintenance Technician 35
Communication Breakdown; Other / Unknown
Aircraft Equipment Problem Critical
Aircraft Aircraft Damaged; Flight Crew Inflight Shutdown; Flight Crew Diverted; Flight Crew Landed in Emergency Condition
Aircraft; Staffing; Human Factors; Company Policy
During flight from ZZZZ to ZZZZ1; left engine lost oil pressure and oil. The aircraft did a [priority] landing in ZZZ. I was called and told to fly to ZZZ to fix aircraft. I went to ZZZ and found that the Engine Tachometer generator had vibrated loose and lost oil. I also noticed the wrong hardware was used to install old generator. I ordered parts needed and repaired aircraft. After; the AMM (Aircraft Maintenance Manual) required a high power engine run; which I could not do at the gate; so we informed [Maintenance Control] and had pilots come out and we would do high power run before takeoff. During the high power run; the pilot over sped [the] engine and engine did a compressor stall. We [then] went back to the gate and started more trouble shooting according to the [Fault Isolation Manual]. We found the ATSU was bad and ordered another. While waiting on ATSU; Maintenance Control scheduled a maintenance ferry flight. I made my opinion clear this was not a good idea. We then received the new ATSU and installed [in accordance with] AMM. We did an engine run and engine did not pass. We reported this to [Maintenance Control] and went back to hotel. The next day; [Maintenance Control] is shooting out ideas and I requested an 18 month background report on this engine. When I read the report; I could not believe it. The maintenance history on this plane was unbelievable. I should have been given this information before I came out to work on plane. I was exhausted; my rotation days were up; [and] I was going home. I was frustrated and gave my two weeks notice. I proceeded home and before I got there; my company phone had been turned off and no access to my company email or safety program. When I tried to call the Director of Maintenance; no answer and he never returned my calls. I could not reach anyone in the company except for [Safety Manager]. After reporting the issue to him; he suggested that I make this report. For the past 35 years; I have been making planes safe for air travel and I will not jeopardize my license or human life for a company to make a dollar.
Mechanic reported experiencing questionable maintenance practices.