Confusion; Workload; Time Pressure
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Human Factors; Incorrect / Not Installed / Unavailable Part; Procedure
We got a call for a Main Landing Gear tire showing cord. We arrived as the passengers were starting to board. My partner started jacking the plane & I serviced the tire. We removed the old tire; swapped them out; and everything seemed to fit fine. We loaded up and went to the parts department to get another tire. It was then that we discovered our mistake and immediately called our lead to try to stop the plane; but it was too late.We went straight over to parts to swap out tires; entered our info on the computer; and realized what had happened.If I knew exactly why; this never would have happened. As we were leaving; another mechanic was using our truck to service a CRJ 900 tire. We arrived at the CRJ 700; feeling a little pressure to get it done quickly; as the passengers were boarding as we got there. I serviced a tire; we swapped it out; and got out of the rampers' way so the plane could be pushed back. The only difference in the two tires is the shoulder width at the hub; and we didn't catch it. The lead on duty was immediately contacted; to see if we could keep the plane from taking off; but it was too late.I need to be more vigilant in learning the new company policies on the color coded caps on the tires for identification purposes; and double check that I'm on the correct CRJ in the future.
This event happened on the ramp during routine line maintenance. A main landing gear tire assembly needed changed on a CRJ 700. A CRJ 900 main landing gear tire assembly was installed on the aircraft. Once we had finished changing the tire we were returning it to our stores department; when it occurred to me that we had used a CRJ 900 tire assembly.We arrived at the aircraft inspected the tire determined it needed changed so I began jacking the aircraft and then proceeded to remove the tire assembly while I was doing this my partner was inflating the new tire assembly in our work vehicle and brought it out to the aircraft. Then we both proceeded to install the new CRJ900 tire assembly on the aircraft; which fits perfectly so no suspicion was raised. Once we realized what had happened we immediately notified the supervisor in charge at the time. Be more vigilant of the CRJ 700 and CRJ 900 tires because they are very similar.
Maintenance installed an incorrect tire on a CRJ-900 aircraft.