MD-83
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Human Factors; MEL; Aircraft
MD-83 aircraft inbound with a discrepancy that the anti-ice light came on for the right engine. On inspection found the right engine; right anti-ice valve would not electrically move to the 'open' position. Placarded the right engine; right anti-ice valve in 'open' position as instructed in MEL. I don't know. There was no discrepancy written in logbook after I placed the MEL. Once again I was in compliance with the MEL. I was in compliance with everything with this MEL. It flew six legs after I placarded the valve with no discrepancy before it landed in ZZZ and stayed 2.7 days. Evening shift. Gate location.
MD-83 Aircraft had an inbound pirep; right engine anti-ice valve light on. Performed troubleshooting; found right outboard anti-ice valve inoperative. Placarded valve per MEL. Accomplished Minimum Performance Downgrade. Four other Maintenance personnel were involved. On the Line during Day shift late morning. After the Aircraft flew for six days with no faults; Maintenance Control attempted to clear the MEL to find it was out of compliance. Between those six days; someone performed undocumented maintenance on the aircraft. The [electrical] jumper that is suppose to be in the special items book is missing and needs to be replaced for future MELs. Ramp location.
Two Aircraft Maintenance Technicians (AMTs) report about an MEL disconnect procedure they had performed on the right engine; right outboard anti-ice valve on an MD-83 aircraft. The valve was later found to be connected and not in compliance with the MEL dispatch requirements they had signed for. Technician notes that undocumented maintenance had occurred.