# SDR 2026FA0000565

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 3, 2026
- Submitted: July 7, 2026
- Operation: General aviation
- Aircraft: [N63DZ](https://openairdocs.org/aircraft/N63DZ), registered now
- Make and model: Lear 45LEAR
- Aircraft serial: 276
- Aircraft time: 4,283 hours, 3,274 cycles
- Engine: Hnywl TFE73120BR
- Engine time: 4,228 hours, 3,226 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Hydraulic System
- Condition: Abnormal
- Location: Zone 100
- 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/2026FA0000565

## Discrepancy

WHILE EN-ROUTE FROM KACY TO KTPA, THE FLIGHT CREW RECEIVED A WHITE MAIN HYD QTY LOW ADVISORY. APPROXIMATELY 50 MINUTES LATER, MAIN HYDRAULIC SYSTEM PRESSURE BEGAN FLUCTUATING AND SUBSEQUENTLY DECREASED STEADILY. THE CREW DIVERTED TO KJAX AND DECLARED AN EMERGENCY.  A MAIN HYD PRESSURE CAS MESSAGE WAS SUBSEQUENTLY DISPLAYED. AS HYDRAULIC PRESSURE CONTINUED TO DECREASE, THE CREW ACCOMPLISHED THE APPLICABLE QRH PROCEDURES, EXTENDING THE LANDING GEAR VIA THE FREE-FALL SYSTEM AND SELECTING FLAPS 20°.  A RED NORMAL BRAKES FAIL CWP WARNING AND A RED BRAKES FAIL CAS MESSAGE WERE THEN DISPLAYED. THE CREW CONDUCTED A VISUAL APPROACH TO RUNWAY 08 AT KJAX. FOLLOWING TOUCHDOWN, NORMAL BRAKING WAS AVAILABLE AND THE AIRCRAFT WAS BROUGHT TO A SAFE STOP WITHOUT FURTHER INCIDENT.  THE AIRCRAFT REMAINS AT KJAX PENDING MAINTENANCE INSPECTION AND TROUBLESHOOTING TO DETERMINE THE SOURCE OF THE HYDRAULIC FLUID LOSS AND RESULTING PRESSURE DEGRADATION.

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