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A B767-200 was dispatched after the right engine hydraulic pump was replaced. 2 hours later; flight diverted due to loss of engine oil due hydraulic pump shaft seal was damaged when installed.
| Attributes | |
| ACN | 673575 |
| Time | |
| Date | 200509 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance lead technician : 2 maintenance technician : 15 |
| ASRS Report | 673575 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : r eng oil qty indicator other flight crewa other flight crewb |
| Resolutory Action | flight crew : diverted to another airport |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : inspection performance deficiency : installation performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : testing |
| Supplementary | |
| Problem Areas | Chart Or Publication Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Aircraft X was turned over to me with the #2 engine driven hydraulic pump inoperative (no pressure). I determined that the pump was at fault; and subsequently removed and replaced the pump. During the replacement; I may have (inadvertently) left the shaft seal (o-ring) off the new pump. After the installation; I motored the engine over to operations check and leak check the installation. All operations checks were normal; and the leak checks were satisfactory. The aircraft logbook was signed off and subsequently released for flight. Approximately 2 hours later; the aircraft experienced a loss of engine oil; and was diverted. Investigation determined shaft seal was in place on shaft but damaged and that amm required idle engine run was not completed. Engine was motored but not run.
Original NASA ASRS Text
Title: A B767-200 WAS DISPATCHED AFTER THE R ENG HYD PUMP WAS REPLACED. 2 HRS LATER; FLT DIVERTED DUE TO LOSS OF ENG OIL DUE HYD PUMP SHAFT SEAL WAS DAMAGED WHEN INSTALLED.
Narrative: ACFT X WAS TURNED OVER TO ME WITH THE #2 ENG DRIVEN HYD PUMP INOP (NO PRESSURE). I DETERMINED THAT THE PUMP WAS AT FAULT; AND SUBSEQUENTLY REMOVED AND REPLACED THE PUMP. DURING THE REPLACEMENT; I MAY HAVE (INADVERTENTLY) LEFT THE SHAFT SEAL (O-RING) OFF THE NEW PUMP. AFTER THE INSTALLATION; I MOTORED THE ENG OVER TO OPS CHK AND LEAK CHK THE INSTALLATION. ALL OPS CHKS WERE NORMAL; AND THE LEAK CHKS WERE SATISFACTORY. THE ACFT LOGBOOK WAS SIGNED OFF AND SUBSEQUENTLY RELEASED FOR FLT. APPROX 2 HRS LATER; THE ACFT EXPERIENCED A LOSS OF ENG OIL; AND WAS DIVERTED. INVESTIGATION DETERMINED SHAFT SEAL WAS IN PLACE ON SHAFT BUT DAMAGED AND THAT AMM REQUIRED IDLE ENG RUN WAS NOT COMPLETED. ENG WAS MOTORED BUT NOT RUN.
Data retrieved from NASA's ASRS site as of January 2009 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.