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After servicing the right hydraulic system quantity on a B767-300 and turning on hydraulic pumps; mechanic notices the center hydraulic reservoir quantity was over full by 20%. Drained center system; turned on hydraulic pumps and right hydraulic quantity at 70%. Made write-up for hydraulic system; or brake shuttle valve internal leak; but supervisor signed-off write-up as system normal.
| Attributes | |
| ACN | 907676 |
| Time | |
| Date | 201009 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Hydraulic Syst Reservoir Tank |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Experience | Maintenance Technician 21 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
I was servicing hydraulic on the right system as it was reading low at 70%. Serviced right system and accomplished leak check by turning on hydraulics. Found no leaks. Did find center system hydraulic overfull [reading] 120%. Drained center system hydraulics to 90%. Turned on hydraulics and found and right system hydraulics to 70%. Made a write-up on system hydraulic as internal leak. Write-up was signed off as system operates normally with no leaks. This affects flight controls and braking. This maintenance issue needs to be fixed. Possible brake shuttle valve leak. This aircraft can lose hydraulics in an overfill condition!!!
Original NASA ASRS Text
Title: After servicing the right hydraulic system quantity on a B767-300 and turning on hydraulic pumps; Mechanic notices the center hydraulic reservoir quantity was over full by 20%. Drained center system; turned on hydraulic pumps and right hydraulic quantity at 70%. Made write-up for hydraulic system; or brake shuttle valve internal leak; but Supervisor signed-off write-up as system normal.
Narrative: I was servicing hydraulic on the right system as it was reading low at 70%. Serviced right system and accomplished leak check by turning on hydraulics. Found no leaks. Did find center system hydraulic overfull [reading] 120%. Drained center system hydraulics to 90%. Turned on hydraulics and found and right system hydraulics to 70%. Made a write-up on system hydraulic as internal leak. Write-up was signed off as system operates normally with no leaks. This affects flight controls and braking. This maintenance issue needs to be fixed. Possible brake shuttle valve leak. This aircraft can lose hydraulics in an overfill condition!!!
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.