# SDR FDEA202609291451

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 29, 2026
- Submitted: October 7, 2026
- Operation: Air carrier
- Aircraft: [N721FD](https://openairdocs.org/aircraft/N721FD), registered now
- Make and model: Airbus A300 B4-622R
- Registry model: [Airbus A300 B4-622R](https://openairdocs.org/model/airbus-a300-b4-622r) (OpenAirDocs)
- Aircraft serial: 477
- Aircraft time: 56,594 hours, 30,995 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Drain Line
- Condition: Misinstalled
- Location: Zone 100
- Stage of operation: CL
- How discovered: O
- Nature of condition: W, J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA202609291451

## Discrepancy

DURING THE CLIMB TO FL160 WE NOTICED THE GREEN HYD SYS QITY DECREASING.  GREEN HYD  SYSTEM CONTINUED TO ZERO ON BOTH ECAM AND OVERHEAD GAUGE. THE BLUE OVER-HEAD HYD SYSTEM QUANTITY  INCREASED TO SHOWING OFF SCALE FULL.  FOLLOWED ECAM & QRH PROCEDURES INCLUDING MANUAL GEAR EXTENSION.  EMERGENCY DECLARED,  FOUND BLUE & GREEN CASE DRAIN LINES SWAPPED AT THE PYLON/ HYDRAULIC JUNCTION   BOX FROM ENG DRAWING. SWAPPED LINES BACK TO CORRECT POSITION IAW AMM 29-12-69-  04-01. REMOVED AND REINSTALLED BLUE & GREEN CASE DRAIN LINES IAW AMM 29-11-32-04-  01. CHECKED CASE DRAIN DPI'S WERE NOT EXTENDED. PERFORMED DRY MOTOR AND BLED   GREEN & BLUE PUMPS NO LEAKS NOTED. ACCOMPLISHED LEAK CHK OF GREEN AND BLUE   CASE DRAIN LINES IN PYLON, NO LEAKS NOTED. ACCOMPLISHED GEAR RETRACTION SYS  PRESSURIZATION (AIRCRAFT ON GROUND) ITEM NO.7 OF 32-31-00-05 OPS CK GOOD NO FLUID   TRANSFER NOTED BETWEEN HYD SYSTEMS. ACCOMPLISHED HIGH POWER RUNS PER   MOCC REQUEST. DURING ENGINE RUNS PERFORMED FLIGHT CONTROL CHECKS NO FAULTS   NOTED AND RAN PACKS NO SMELL OF HYDRO NOTED. SERVICED HYDS TO CORRECT LEVELS. A/C OK FOR SERVICE.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.