Maintenance Airframe; Maintenance Powerplant
Situational Awareness; Time Pressure; Troubleshooting
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Manuals; MEL; Human Factors
When myself and another Mechanic arrived at the aircraft; we were made aware of an Engine #2 (E2) Oil Impeller Bypass message happening during flight; from the logbook. The other Mechanic spoke with the pilot(s) and checked the cockpit indications; while I waited outside because the passengers were beginning the boarding process. We were in contact with Maintenance Control about the message. I spoke with Maintenance Control in regards to the differential indication on the oil filter. I verified with them that once we opened up the E2 Cowl; the red indicator did not appear to be popped and we were advised that the E2 Oil Impeller Bypass message could be MEL'd. From there; the other Mechanic communicated that the Central Maintenance Computer (CMC) showed no oil debris message of any sort; while I placed the E2 oil impeller bypass message on deferral. Based on the message and the Maintenance actions; MEL 79-35-01-1 was used as the reference. The Fault Isolation Manual (FIM) was not used. The FIM would have been a better reference; without regard to time. Despite working well in a team manner and communicating well throughout the task; I could have reviewed the other mechanics work.
A Line Mechanic reports he deferred a #2 Engine Oil Impeller Bypass message on an EMB-145 aircraft after referencing  maintenance actions that he and another Mechanic had performed. He was later notified the Fault Isolation Manual (FIM); which he did not use; would have been a better reference souce for the deferral.