Regional Jet 900 (CRJ900)
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown; Confusion; Distraction; Situational Awareness; Time Pressure
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Incorrect / Not Installed / Unavailable Part; Manuals; Human Factors
Upon starting my shift; June morning 2013; Mechanic Y and I; as (Mechanic X); were informed that we were going to [another airport] to replace a right hand; inboard Slat Disconnect Sensor that was physically broken on a CRJ-900 aircraft. Arriving at the gate; I ordered the part with the part number given to me from Maintenance Tracking Program  parts computer system for merged Air Carrier aircraft; instead of [using] our Air Carrier's Parts Computer System. I transposed a CRJ-900 aircraft into a CRJ-200 aircraft in my head; mistakenly made a material request for a CRJ-200 and prepared tooling; manual references; etc. to leave [for the other airport]. It was not until we arrived back that I realized that I had the wrong Serviceable tag; and that I had ordered the part from the wrong stock. I discovered I had the wrong type of Serviceable tag for the aircraft I was working on. I was slightly rushed to get everything together to get to the plane on time; but I am in no way using that as an excuse for the mental lapse. I just did not pay close enough attention to which fleet I was to work on. I contacted the Supervisor on duty. [Recommend] paying closer attention to what aircraft fleet I am working on. Aircraft Out of Service (AOS).
A Line Aircraft Maintenance Technician (AMT) realizes he improperly ordered an inboard Slat Disconnect Sensor for a CRJ-900 aircraft through the parts computer ordering system of their merged Air Carrier's inventory program; instead of using their own parts ordering system. He noticed the incorrect serviceable tag after returning from a field trip.