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Mechanic reports he inspected; but did not notice a horizontal stabilizer (H/south) pitch trim switch had been installed 180-degrees from the proper position on an emb-145 aircraft. An operational check of the pitch trim by another shift failed to notice the H/south moving in the opposite direction contributing to an inflight incident.
| Attributes | |
| ACN | 1028669 |
| Time | |
| Date | 201208 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 145 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff Parked |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Horizontal Stabilizer Trim |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Repairman |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Inflight Event / Encounter Other / Unknown |
Narrative:
Mechanic Y reinstalled a first officer's pitch trim switch on a emb-145 aircraft; which I inspected and back-signed. I did not notice it was installed 180-degrees from the proper position. We then made a logcan discrepancy [write-up] for an operational check for the replacement of the switch. At the time we could not apply power to the aircraft to perform the operational check; so it was turned over to the night shift. When the operational check was complied with; it was not caught that the horizontal stabilizer was moving in the wrong direction. I have completed and submitted an inspection manual discrepancy report. Due to the severity of this incident; the manual in question needs to have a warning and possibly an illustration of the proper orientation of the pitch trim switch.
Original NASA ASRS Text
Title: Mechanic reports he inspected; but did not notice a Horizontal Stabilizer (H/S) Pitch Trim switch had been installed 180-degrees from the proper position on an EMB-145 aircraft. An Operational Check of the Pitch Trim by another shift failed to notice the H/S moving in the opposite direction contributing to an inflight incident.
Narrative: Mechanic Y reinstalled a First Officer's Pitch Trim switch on a EMB-145 aircraft; which I inspected and back-signed. I did not notice it was installed 180-degrees from the proper position. We then made a Logcan discrepancy [write-up] for an Operational Check for the replacement of the switch. At the time we could not apply power to the aircraft to perform the Operational Check; so it was turned over to the night shift. When the Operational Check was complied with; it was not caught that the Horizontal Stabilizer was moving in the wrong direction. I have completed and submitted an inspection manual discrepancy report. Due to the severity of this incident; the manual in question needs to have a warning and possibly an illustration of the proper orientation of the Pitch Trim switch.
Data retrieved from NASA's ASRS site as of July 2013 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.