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A B737-300 in cruise shutdown the left engine due to loss of oil pressure and quantity, caused by angle gearbox housing flange bolts missing.
| Attributes | |
| ACN | 566448 |
| Time | |
| Date | 200211 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : dfw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 566448 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 567170 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : low oil press warning other other : person 1 |
| Resolutory Action | flight crew : landed in emergency condition |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure contributing factor : work cards performance deficiency : inspection performance deficiency : installation performance deficiency : non compliance with legal requirements performance deficiency : testing |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
Flight called halfway between and said they had #1 engine lop light on and shutdown #1 engine when the aircraft arrived uneventfully, and I opened up the cowl, the seal on the flange gearbox return oil line was leaking. It was leaking because the bolts of flange were gone -- missing. I had the bolts and a new seal sent, and after installation, leak checked good. I removed and checked chip detectors and filter, and all were clean. I performed a power assurance run, and all was normal per M/M. Back at the gate, I checked the chip detectors and seal one last time, all checked ok. Callback conversation with reporter revealed the following information: reporter stated when the cowling was open it was found the angle gearbox housing flange was missing the attach bolts. The reporter said the seal and bolts were replaced, leaked checked, and checked ok on run.
Original NASA ASRS Text
Title: A B737-300 IN CRUISE SHUTDOWN THE L ENG DUE TO LOSS OF OIL PRESSURE AND QUANTITY, CAUSED BY ANGLE GEARBOX HOUSING FLANGE BOLTS MISSING.
Narrative: FLT CALLED HALFWAY BTWN AND SAID THEY HAD #1 ENG LOP LIGHT ON AND SHUTDOWN #1 ENG WHEN THE ACFT ARRIVED UNEVENTFULLY, AND I OPENED UP THE COWL, THE SEAL ON THE FLANGE GEARBOX RETURN OIL LINE WAS LEAKING. IT WAS LEAKING BECAUSE THE BOLTS OF FLANGE WERE GONE -- MISSING. I HAD THE BOLTS AND A NEW SEAL SENT, AND AFTER INSTALLATION, LEAK CHKED GOOD. I REMOVED AND CHKED CHIP DETECTORS AND FILTER, AND ALL WERE CLEAN. I PERFORMED A PWR ASSURANCE RUN, AND ALL WAS NORMAL PER M/M. BACK AT THE GATE, I CHKED THE CHIP DETECTORS AND SEAL ONE LAST TIME, ALL CHKED OK. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED WHEN THE COWLING WAS OPEN IT WAS FOUND THE ANGLE GEARBOX HOUSING FLANGE WAS MISSING THE ATTACH BOLTS. THE RPTR SAID THE SEAL AND BOLTS WERE REPLACED, LEAKED CHKED, AND CHKED OK ON RUN.
Data retrieved from NASA's ASRS site as of July 2007 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.