 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Technician reported a proximity switch target that was improperly installed during the heavy check process; caused a #1 system prox fault.
| Attributes | |
| ACN | 1713862 |
| Time | |
| Date | 201910 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Regional Jet 900 (CRJ900) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Indicating and Warning - Landing Gear |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy |
Narrative:
Plane came in with proximity system 1 fault. Went through mdc (maintenance data computer) to isolate which proximity sensor was faulting. After confirming [the] fault; [the] aircraft was sent to [the] hangar. [I] jacked [up the] aircraft and upon closer and more proper inspection of target; [I] found that it was installed backward. This caused the target to be a lot closer to the sensor. After comparing it to the adjacent targets and confirming with tech data; we concluded that the target was definitely installed incorrectly.because the aircraft only recently exited from heavy check; we assume it happened during that process as it could easily be overlooked. [I] removed [the] target; flipped it; re-installed; and performed all adjustments and operation checks in accordance with all [of] the appropriate tech data. It is not uncommon to see planes exit heavy check with small mishaps causing big problems and thereby delays. There could perhaps be a more thorough process in order to return these aircraft to service.
Original NASA ASRS Text
Title: Technician reported a proximity switch target that was improperly installed during the heavy check process; caused a #1 System Prox Fault.
Narrative: Plane came in with PROX SYS 1 fault. Went through MDC (Maintenance Data Computer) to isolate which PROX sensor was faulting. After confirming [the] fault; [the] aircraft was sent to [the] hangar. [I] jacked [up the] aircraft and upon closer and more proper inspection of target; [I] found that it was installed backward. This caused the target to be a lot closer to the sensor. After comparing it to the adjacent targets and confirming with tech data; we concluded that the target was definitely installed incorrectly.Because the aircraft only recently exited from heavy check; we assume it happened during that process as it could easily be overlooked. [I] removed [the] target; flipped it; re-installed; and performed all adjustments and operation checks in accordance with all [of] the appropriate tech data. It is not uncommon to see planes exit heavy check with small mishaps causing big problems and thereby delays. There could perhaps be a more thorough process in order to return these aircraft to service.
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.