# SDR FDEA202602250279

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 25, 2026
- Submitted: February 25, 2026
- Operation: Air carrier
- Aircraft: [N121FE](https://openairdocs.org/aircraft/N121FE), registered now
- Make and model: Boeing 767-3S2F
- Registry model: [Boeing 767-3S2F](https://openairdocs.org/model/boeing-767-3s2f) (OpenAirDocs)
- Aircraft serial: 43545
- Aircraft time: 19,838 hours, 8,369 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Indicator
- Part number: 7586631
- Part serial: NSN
- Condition: Leaking
- Location: Hyd System
- Stage of operation: CR
- 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/FDEA202602250279

## Discrepancy

LOST HYDRAULIC SYSTEM NR 1 QTY IN CRUISE FL370. AMM: 29-11-17-4  JRH: CHAP 6  AMM: 12-12-01-3  CONFIRMED HYD LT EDP & LT ELECT  PUMP SWITCHED IS IN OFF POSITION IAW QRH  AFTER ACFT BLOCK IN. PERFORMED LEAK CHK FOUND LT DIFFERENTIAL PRESSURE. INDICATOR FOR PRESSURE FILTER  AT LT ENG DRIVEN PUMP PRESSURE/CASE DRAIN  FILTER MODULE LEAKING. RT & LT DIFF. PRESS.  INDICATOR AND PRESSURE FILTER ELEMENT IAW AMM 29-11-17-4. SERVICE  HYD FLUID IAW AMM 12-12-01-3. RAN LT ENG  AS PER B767 JRH  6. HYD SYS & LEAK CHKD FOUND SATISFACTORY. ACFT OK FOR SERVICE.   FOUND DELTA P INDICATOR INSIDE L PYLON BLOWN, DRAINING #1 HYD INDICATOR REPLACED, PRESSURE FILTER REPLACED, SERVICED HYD FLUID, RAN ENGINES SATIS.

---
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.