# SDR CALA2026101620413

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 15, 2026
- Submitted: October 16, 2026
- Operation: Air carrier
- Aircraft: [N14106](https://openairdocs.org/aircraft/N14106), registered now
- Make and model: Boeing 757224
- Aircraft serial: 27296
- Aircraft time: 116,118 hours, 27,206 cycles
- Engine: Rroyce RB211535E4
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: O-Ring
- Part number: NAS16126A
- Condition: Leaking
- Location: Zone 100
- Stage of operation: AP
- 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/CALA2026101620413

## Discrepancy

C-HYD QTY EICAS,  LEAK COMING FROM DUAL PRESS/CASE DRAIN MODULE-C LOCATED IN HYD SERVICING BAY. LEAKING COMING FROM UPPER SWITCH BASE ASSY SEE PIC. PULLED AND COLLARED BOTH CENTER HYD PUMP CBS. REMOVED AND REPLACED O-RING ON UPPER PRESSURE SWITCH OF FILTER MODULE AND CASE DRAIN FOR CENTER ACMP  IAW AMM 29-11-19-404-035. NO LEAKS NOTED. C PRESSURE REMAINS STEADY. C-HYD SERVICED BACK TO ALLOWABLE LIMITS.

---
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.