Commercial Fixed Wing
Maintenance Powerplant; Maintenance Airframe
Training / Qualification; Communication Breakdown; Workload
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter FOD
General Flight Cancelled / Delayed; General Maintenance Action
Human Factors; Chart Or Publication; Aircraft; Procedure
During accomplishment of portable water system disinfect done by using ozone cart; as instructed by fellow mechanic assigned as support; (name unknown). I might have improperly connected the water supply line. This happened at ZZZ [Gate] around XA:00 [Date]. As soon as I noticed water coming out of the aft fuselage drain holes; I immediately stopped the re circulation process; notified crew chef; dumped over serviced wasted and requested for assistance form tech crew personnel.Lack of work experience with this specific task on my part; lack of assigned training; inability to complete work interdependently due to not having D1 endorsement and being able to drive on airport premises and move around with equipment and tools. Hostile work environment.Assigned training required to completed before being assigned to perform ozone cards; different diameter or tread pattern on water fill line attainment port preventing from improper installation; picture diagrams included in revised work card; hands on ozone unit classroom training; ZZZ ramp driving credentials; hangar access in below freezing conditions; better gate illumination; larger port markings allowing to differentiate between both ports housed only 3 ft. apart.
I was assigned to drive new transfer AMT's around since none of them had their DR1/3. One group required the 'blue cart' for water servicing; and the tech responsible for the job asked me questions about it. I gave him a basic description of the job; helped hooked the FILL line to the FILL nipple; and showed him the correct adapter for the job and threaded it in to show it was the right fit. After which I left to move other techs around. When I came back to the gate; that's when the results of the improper servicing occurred. The event occurred at [Gate] at roughly XA:00 on [Date] during the cycling phase of the disinfect.
Technicians reported not connecting potable water disinfection equipment to aircraft correctly; causing the aircraft to flood the lower areas.