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B737 mechanic reported the aircraft he worked on diverted due to engine oil loss caused by a loose engine oil line fitting.
| Attributes | |
| ACN | 1595154 |
| Time | |
| Date | 201811 |
| Aircraft 1 | |
| Make Model Name | B737-900 |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Oil Line |
| Person 1 | |
| Function | Inspector |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
I was made aware of aircraft diverting due to the loss of engine oil on the number two engine. It was discovered that a line next to the fuel/oil heater was loose. The day before; I was involved as an inspector of the installation of a scheduled hmu (hydro mechanical unit) change. I performed a detailed visual inspection of the hmu prior to engine runs. During & after the engine runs no leaks were noted.due to the fact that only an idle leak check is required; fittings and connections are not tested for integrity under max loads. During any eng change; fuel pump; hmu ect. Regardless of its test status (tested or untested) the engs should be taken to high power setting to verify the integrity and security of all fittings and connections while under max pressures and loads. I believe if this had been a part of the run procedures this incident could have been avoided.
Original NASA ASRS Text
Title: B737 Mechanic reported the aircraft he worked on diverted due to engine oil loss caused by a loose engine oil line fitting.
Narrative: I was made aware of aircraft diverting due to the loss of engine oil on the number two engine. It was discovered that a line next to the fuel/oil heater was loose. The day before; I was involved as an inspector of the installation of a scheduled HMU (Hydro Mechanical Unit) change. I performed a detailed visual inspection of the HMU prior to engine runs. During & after the engine runs no leaks were noted.Due to the fact that only an idle leak check is required; fittings and connections are not tested for integrity under max loads. During any eng change; fuel pump; HMU ect. regardless of its test status (tested or untested) the engs should be taken to high power setting to verify the integrity and security of all fittings and connections while under max pressures and loads. I believe if this had been a part of the run procedures this incident could have been avoided.
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.