Aircraft maintenance technician reported maintenance on engine prior to inflight engine malfunction.
Synopsis
Aircraft maintenance technician reported maintenance on engine prior to inflight engine malfunction.
Narrative
I worked on the #2 engine change on the aircraft. I was informed last night aircraft X experienced an engine 2 thrust lever disagree caution ECAM message in flight that led to a diversion into ZZZ. It is my understanding that the mechanic that responded to the discrepancy at ZZZ found connector 407VC-A not completely engaged; and that is the supposed reason for the fault in flight. During the engine change; I was the mechanic that installed connector 407VC-A. I have installed these particular pylon connectors on A320 engine changes before and am familiar with the task. I make a point every time I perform maintenance to ensure I am following the current work card; and this task was no exception. I also have a personal habit of installing these pylon connectors left-to-right; ensuring each connector is tightened properly before moving on to the next one. When installing each connector; I use cannon plug pliers to ensure the plug is tightened securely and completely. When installing connector 406VC-A; which is located directly to the right of connector 407VC-A; I realized the connector 406VC-A was not engaging in its receptacle because it was routed too short when the engine was built up. During troubleshooting of this; a fellow mechanic and I decided to loosen and remove connector 407VC-A to give us more room to work. After adjusting several clamps on the harness attached to connector 406VC-A; we were able to engage connector 406VC-A. At this point; I stopped to reinstall and secure connector 407VC-A. We didn't want to remove connector 406VC-A after it was engaged; because we had spent upwards of 30-40 minutes trying to get this one connector to engage. I installed connector 407VC-A and tightened it securely with my cannon plug pliers; ensuring to the best of my knowledge that it was fully engaged and tight. I then proceeded to complete the installation of connector 406VC-A and the remaining pylon connectors in this area. After completing the installation of these pylon connectors; I double-checked my work to ensure everything was installed correctly at least three more times before leaving at the end of my shift. To the best of my knowledge; connector 407VC-A was installed properly and safe for flight. I take personal pride in my work and am not able to leave work that I've performed until I'm as sure as I can be that it is completed safely and properly.
Second reporter narrative
I was the lead technician on Aircraft X #2 scheduled engine change. I signed for the technician that did the electric hook-ups. The technician is a very thorough technician and he relayed to me that all the cannon plugs were tight. When the plane left for a revenue flight; it had an inflight shut-down and the subsequent inspection found canon plug 407VCA was loose.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.