MD-11
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown; Situational Awareness
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Diverted
Procedure; Manuals; Incorrect / Not Installed / Unavailable Part; Chart Or Publication; Human Factors; Aircraft
I was assigned to Remove and Replace (R/R) the Generator Relay (GR) GR1 on an MD-11 aircraft. After installation of the relay; I torqued the feeder cables and connected the Generator Relay plug as per Aircraft Maintenance Manual (AMM) 24-21-05-4. I then reinstalled the access panels. I documented in Maintenance computer the removal and installation of the relay and left the item in work and turned over to next shift; as I had no more time to perform the Operational Test required per AMM. The item had been closed by the Aircraft Maintenance Technician (AMT) who performed a successful run-up and test required by the AMM; and released the Aircraft. The aircraft flew 16-legs until five days later [on the way] to ZZZ1 where it stayed on 4-day layover. At that time; ZZZ1 updated the MD-11 Information System (MDIS) as the Relay; Generator and Auxiliary Power adjustment and test was performed per AMM 24-21-05-5; using the test box. This procedure requires disconnecting the GR plugs. Later that day; the aircraft departed ZZZ1 and flew 7-legs and a diversion to ZZZ2. [Recommend that work be] checked by a second AMT.
A Line Mechanic reports he Removed and Replaced (R/R) a Generator Relay (GR); GR1 position; on an MD-11 aircraft. The Relay; Generator and Auxiliary Power Adjustment and Test were performed days later; but the aircraft diverted several flights after being release from Maintenance.