 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Improper removal procedure resulted in damage to a radar waveguide during maintenance.
| Attributes | |
| ACN | 842287 |
| Time | |
| Date | 200907 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Weather Radar |
| Person 1 | |
| Function | Technician |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
Aircraft had a weather radar log and also one prior history with the weather radar. Testing and troubleshooting reference; the amm; showed no faults or defects. After talking to other mechanics we decided that replacing the radar dish plate would be the best course of action. The aircraft was parked at the gate and it was nighttime. The MM states that you must remove four waveguide flange bolts before removing the eight ring mount bolts or damage can result. I visually searched for the planar waveguide bolts for sometime and never saw the four mount bolts. I thought that maybe the antenna I was working on didn't have these bolts after the upgrade modification was done to it. I proceeded to remove the eight ring bolts. When I removed the planar from the weather radar mount; I noticed that the waveguide had been torn from the radar.
Original NASA ASRS Text
Title: Improper removal procedure resulted in damage to a radar waveguide during maintenance.
Narrative: Aircraft had a weather radar log and also one prior history with the weather radar. Testing and troubleshooting reference; the AMM; showed no faults or defects. After talking to other mechanics we decided that replacing the radar dish plate would be the best course of action. The aircraft was parked at the gate and it was nighttime. The MM states that you must remove four waveguide flange bolts before removing the eight ring mount bolts or damage can result. I visually searched for the planar waveguide bolts for sometime and never saw the four mount bolts. I thought that maybe the antenna I was working on didn't have these bolts after the upgrade modification was done to it. I proceeded to remove the eight ring bolts. When I removed the planar from the weather radar mount; I noticed that the waveguide had been torn from the radar.
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.