# SDR USAABB99062

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 31, 1999
- Submitted: July 18, 2000
- Operation: Air carrier
- Aircraft: [N647US](https://openairdocs.org/aircraft/N647US), registered now
- Make and model: Boeing 767201
- Aircraft serial: 23899
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Seal
- Part number: 271T00703
- Condition: Ruptured
- Location: Hyd System
- Stage of operation: CL
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAABB99062

## Discrepancy

CDG - FLT 23 - AFTER TAKEOFF FROM CDG, CREW NOTED THE LEFT HYDRAULIC QUANTITY DECREASING TO ZERO, AND THE LEFT SYSTEM QUANTITY AND PRESSURE LIGHTS ILLUMINATING.  CRWE ALSO RECEIVED THE EICAS MESSAGES L HYD QTY AND L HYD SYS PRESS.  FLIGHT RETURNED TO CGD AND LANDED WITHOUT FURTHER INCIDENT.  MAINTENANCE FOUND A SEAL RUPTURED IN THE LEFT EDP PRESSURE AND CASE DRAIN FILTER MODULE ASSEMBLY.  MODULE WAS REPLACED.  THE VENDOR REPORTED THAT A PRESSURE SURGE OCCURED WHICH DESTROYED THE FILTER AND COCKED THE FILTER HOUSING, DAMAGING BOTH THE FILTER HOUSING AND CASE THREADS, RESULTING IN THE LEAK.  (M)

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