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A line aircraft maintenance technician (amt) reports he may have over-tightened the clamp or damaged the threads on a 'T' bar strap that secures the crew oxygen bottle on a B737-700 aircraft. Lack of available correct replacement hardware and pressure to avoid maintenance delays were also noted by technician.
| Attributes | |
| ACN | 1173249 |
| Time | |
| Date | 201405 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
I was assigned to replace a crew oxygen bottle on a live through flight. In the process; I lost the nut that secures the clamp that secures the crew oxygen bottle in place. So I went to our shop stock room to find a replacement nut. We did not have the exact nut; but I found one that fit; so I used it to secure the oxygen bottle in place. But this nut had a locking feature that made it harder to start on the clamp 'T' bar threads and then it got easy to tighten. Because of this; I may have over-tightened the clamp or damaged the threads on the 'T' bar. A contributing factor could be the pressure to avoid causing flight delays due to aircraft maintenance tasks. I am submitting this ASRS report and I contacted (company) maintenance control (moc) about this incident to make sure that the crew oxygen bottle is installed correctly and ensure the flight safety of this B737-700 aircraft and the passengers that fly on it. Evening shift. [Recommend] stocking the correct hardware for the crew oxygen bottle replacement and understanding from our management team that sometimes flight delays caused by aircraft maintenance work are unavoidable. Aircraft later corrected.
Original NASA ASRS Text
Title: A Line Aircraft Maintenance Technician (AMT) reports he may have over-tightened the clamp or damaged the threads on a 'T' bar strap that secures the crew oxygen bottle on a B737-700 aircraft. Lack of available correct replacement hardware and pressure to avoid maintenance delays were also noted by Technician.
Narrative: I was assigned to replace a crew oxygen bottle on a live through flight. In the process; I lost the nut that secures the clamp that secures the crew oxygen bottle in place. So I went to our shop stock room to find a replacement nut. We did not have the exact nut; but I found one that fit; so I used it to secure the oxygen bottle in place. But this nut had a locking feature that made it harder to start on the clamp 'T' bar threads and then it got easy to tighten. Because of this; I may have over-tightened the clamp or damaged the threads on the 'T' bar. A contributing factor could be the pressure to avoid causing flight delays due to aircraft maintenance tasks. I am submitting this ASRS report and I contacted (Company) Maintenance Control (MOC) about this incident to make sure that the crew oxygen bottle is installed correctly and ensure the flight safety of this B737-700 aircraft and the passengers that fly on it. Evening shift. [Recommend] stocking the correct hardware for the crew oxygen bottle replacement and understanding from our Management team that sometimes flight delays caused by aircraft maintenance work are unavoidable. Aircraft later corrected.
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.