EMB ERJ 170/175 ER/LR
Training / Qualification; Time Pressure; Confusion; Communication Breakdown; Workload
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural MEL / CDL; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem; General Flight Cancelled / Delayed
Procedure; Human Factors; MEL
I was asked to replace the potable water fill line elbow hose on Aircraft X. The original line was punctured and the potable water system placed on MEL (Minimum Equipment List). I replaced that line. I cleared the MEL and the aircraft was taken to the gate and released. We usually drain the potable water system in the hangar in colder weather before it goes back to the gate.At the gate; the ramp service noticed the 'DO NOT SERVICE' placard was still installed on the potable water service door. They contacted the hangar and were told that the aircraft was ok to service. A short while later the Lead asked me about it and we determined that the potable water system had not been fully restored as per the MEL procedure. The galley shut off valves and lavatory shut off valves were not returned to the open position. Our line mechanics tried to go to the airplane but it had already pushed back and they were unable to open the shut off valves. Our supervisors were notified that the potable water system had not been fully restored; the flight crew was contacted and were able to open the valves.I failed to completely understand the procedures before restoring the potable water system. When I was asked to change the line; I was working on another aircraft and had to finish the maintenance on that aircraft before I could work on Aircraft X.When ramp noticed the sticker; I was taxiing another aircraft and was not able to immediately talk to my lead about the restoration of the potable water system. I had a lot of tasks to complete on multiple aircrafts and was rushing to complete the assigned tasks. In the future I will try to completely understand maintenance procedures and utilize my time to compete the task at hand and to not allow myself to be rushed.
Maintenance Technician reported potable water system was not properly restored per MEL procedure.