Regional Jet 900 (CRJ900)
Maintenance Airframe; Maintenance Powerplant
Time Pressure
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Human Factors; Procedure
Aircraft X LH #1 OB Slat Actuator torque tube fell off. While performing a slat actuator remove and replace job for Aircraft X at wing station 164.00 for the left #1 outboard slat actuator; I thought that I aligned the torque tube hole with the actuator shaft hole; I continued to secure the actuator to the aircraft thinking that everything was correct; I have done this job several times beforehand and was comfortable doing the job; obviously I was mistaken and did not fully seat the torque tube completely on the actuator shaft. I went to slide the bolt in through the hole of the torque tube thinking that it was attached to the actuator. My mistake caused the torque tube to come off of the actuator shaft. Was reported that pilots could not retract the slats and flaps after landing. This was an honest mistake on my part. There was no environmental distractions to take my mind off the job; I was not pressed for time; did not rush the job; and it was an easy/slow night at the hanger.
Technician reported incorrectly installing leading edge slat actuator torque tube; causing flaps and slats to be  unable to retract.