B787 Dreamliner Undifferentiated or Other Model
Maintenance Airframe; Maintenance Powerplant
Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Other / Unknown
General Maintenance Action
Procedure
I was assigned aircraft to check and placard the aft crew rest l/h fwd curtain; which was currently placarded; by Personnel XX. The aircraft arrived at gate and was pulled by the pull crew to go to the departure gate. The aircraft arrived on the departure gate. I went out to check on the crew rest curtain that I was assigned. When I entered L2 door and walked through the cabin; I noticed an unknown substance throughout the entire cabin; but not limited to overhead bins; ceiling panels; sidewall trim; galleys and interior door trim; and I created a [maintenance ticket]. I notified Personnel XX of what I discovered; he said he would let Supervisor XX know to come out and sign off the logbook. Supervisor XY came out and Mechanic XX was interior ETOPS; doing his check when we showed Supervisor XY the unknown substance in the cabin. I pointed and used my flashlight to show him the areas that I saw with the unknown substance in the cabin Personnel XX sent me a text to go to lunch; I was in the middle of assisting Mechanic XX on a PIREP with the f/c ovens that would only show the temp in c and the flight attendants wanted the temp to show in f. I was sent to lunch as a retaliatory action by Management and Personnel XX for writing up the unknown substance in the log book. Personnel XX asked other mechanics who were on lunch if the wanted a broken lunch ( .5 hrs. overtime) while he sent me to lunch. I was assigned to work on that aircraft; Personnel XX never sent Mechanic XX or Mechanic XY to lunch; they both were handed sheets signed by Personnel XX to receive their paid lunch; I was not. The aircraft [maintenance ticket] was signed off by [Company] Management Supervisor XX. Inspected aircraft with environmental coordinator found to be consistent with previously affected airplanes to be over-spray of disinfection residue. [Company] policy and procedures have not been followed; the Environmental Manual section [for] spill response guide for line stations; Unknown Spill Identification Checklist and [Company] Form XX Checklist not done. Aircraft signed off going out on trip.
B787 Mechanic reported unknown dried substance residue throughout the cabin. Entered in aircraft logbook and and reported to Supervisor.