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A mechanic reported a serviceable trimmable horizontal stabilizer (ths) jackscrew assembly they had installed on an A319 aircraft would not pass an operational test. The pitch trim actuator had faulted requiring another ths to be installed.
| Attributes | |
| ACN | 971849 |
| Time | |
| Date | 201109 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Horizontal Stabilizer Trim Motor |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
After installing a serviceable trimmable horizontal stabilizer (ths); we were unable to pass the ths operational checks. While troubleshooting for a couple of days [we] found [two] units to be causing our problems. Pitch trim actuator to be bad; installed a replacement unit; ths passed that test. See rejected component tag. Also found transducer was failing [during] spoiler elevator computer (second-2) test. This too was replaced and the ths passed all tests.
Original NASA ASRS Text
Title: A Mechanic reported a Serviceable Trimmable Horizontal Stabilizer (THS) jackscrew assembly they had installed on an A319 aircraft would not pass an operational test. The Pitch Trim Actuator had faulted requiring another THS to be installed.
Narrative: After installing a Serviceable Trimmable Horizontal Stabilizer (THS); we were unable to pass the THS operational checks. While troubleshooting for a couple of days [we] found [two] units to be causing our problems. Pitch Trim Actuator to be bad; installed a replacement unit; THS passed that test. See Rejected Component Tag. Also found Transducer was failing [during] Spoiler Elevator Computer (SEC-2) Test. This too was replaced and the THS passed all tests.
Data retrieved from NASA's ASRS site as of April 2012 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.