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A B757-200, on taxi out, experienced loss of left hydraulic system pressure and quantity due to a flight spoiler actuator failure.
| Attributes | |
| ACN | 482114 |
| Time | |
| Date | 200006 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance repairman : 4 maintenance technician : 7 |
| ASRS Report | 482114 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : left hydraulic qty ind other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : engineering procedure contributing factor : manuals contributing factor : work cards |
| Supplementary | |
| Problem Areas | Company Aircraft Chart Or Publication |
| Primary Problem | Aircraft |
Narrative:
Complete failure of piston rod seal and retainer. Total loss of hydraulic fluid in l-hand system. 3/4 of center system failure during taxi out. Aircraft return to gate. Improper torque on the gland nut may be the cause of failure. New notes have been added to our overhaul service manual. The gland nut is also sent out to non destructive testing for checks of cracks.
Original NASA ASRS Text
Title: A B757-200, ON TAXI OUT, EXPERIENCED LOSS OF L HYD SYS PRESSURE AND QUANTITY DUE TO A FLT SPOILER ACTUATOR FAILURE.
Narrative: COMPLETE FAILURE OF PISTON ROD SEAL AND RETAINER. TOTAL LOSS OF HYD FLUID IN L-HAND SYS. 3/4 OF CTR SYS FAILURE DURING TAXI OUT. ACFT RETURN TO GATE. IMPROPER TORQUE ON THE GLAND NUT MAY BE THE CAUSE OF FAILURE. NEW NOTES HAVE BEEN ADDED TO OUR OVERHAUL SVC MANUAL. THE GLAND NUT IS ALSO SENT OUT TO NON DESTRUCTIVE TESTING FOR CHKS OF CRACKS.
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.