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A line mechanic reports finding a deteriorated o-ring at the union attached to the parking brake valve after the inbound A320 aircraft loss yellow hydraulic system pressure and quantity. O-ring appeared to be made of material not compatible with skydrol type hydraulic fluid.
| Attributes | |
| ACN | 919596 |
| Time | |
| Date | 201011 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Hydraulic System Lines Connectors Fittings |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Amber alert. Loss of yellow hydraulic system pressure and quantity; thirty miles out; inbound to ZZZ. Found o-ring eroded on the union attached to the parking brake valve. (Illustrated parts catalog) ipc 32-45-03-3b; item #230. I have the damaged packing; it looks like the material the o-ring was made of is not compatible with skydrol; o-ring just disintegrated; part number NAS-1612-8.
Original NASA ASRS Text
Title: A Line Mechanic reports finding a deteriorated O-ring at the union attached to the Parking Brake valve after the inbound A320 aircraft loss Yellow Hydraulic System pressure and quantity. O-ring appeared to be made of material not compatible with Skydrol type hydraulic fluid.
Narrative: Amber alert. Loss of Yellow Hydraulic System pressure and quantity; thirty miles out; inbound to ZZZ. Found O-ring eroded on the union attached to the parking brake valve. (Illustrated Parts Catalog) IPC 32-45-03-3b; Item #230. I have the damaged packing; it looks like the material the O-ring was made of is not compatible with Skydrol; O-ring just disintegrated; Part Number NAS-1612-8.
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.