# SDR 2026FA0000615

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 9, 2026
- Submitted: August 4, 2026
- Operation: General aviation
- Aircraft: [N441SK](https://openairdocs.org/aircraft/N441SK), registered now
- Make and model: Cessna 441
- Registry model: [Cessna 441](https://openairdocs.org/model/cessna-441) (OpenAirDocs)
- Aircraft serial: 4410159
- Aircraft time: 23,982 hours, 21,289 cycles
- Engine: Garrtt TPE33110N
- Propeller: Mcauly 3GFR34C601
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Hydraulic Line
- Part number: 572700288
- Condition: Leaking
- Location: Zone 500
- Component: Uplock Actuator, Cessna
- Component part number: 57271108
- Stage of operation: LD
- How discovered: O
- Nature of condition: K, G
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2026FA0000615

## Discrepancy

ON DESCENT LT AND RT "HYD LOW FLOW" ANNUNCIATORS START FLICKERING THEN WENT FULLY ON. EXTENDED LANDING GEAR BUT ONLY LT MAIN WENT DOWN AND LOCKED. BLEW THE LANDING GEAR BLOWDOWN BOTTLE, HEARD THE BOTTLE BLOW BUT HAD NO FURTHER DOWN AND LOCKED INDICATION. AFTER AIRCRAFT RECOVERY, PUT ON JACKS IN HANGER, CONNECTED HYDRAULIC MULE TO AIRCRAFT. STARTED WITH PRESSURE BACKED OFF AND STEADILY INCREASED PRESSURE TO 500PSI. AT 500PSI NOTED HYDRAULIC LINE P/N 5727002-88 LEAKING FROM A PIN HOLE AND ALSO NOSE LANDING GEAR UPLOCK ACTUATOR SHAFT SEAL LEAKING. SYSTEM PRESSURE IS 1750PSI.

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