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Technician reported incorrectly installing leading edge slat actuator torque tube; causing flaps and slats to be unable to retract.
| Attributes | |
| ACN | 1704970 |
| Time | |
| Date | 201911 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Regional Jet 900 (CRJ900) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Leading Edge Slat |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy |
Narrative:
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.
Original NASA ASRS Text
Title: Technician reported incorrectly installing leading edge slat actuator torque tube; causing flaps and slats to be unable to retract.
Narrative: 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.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.