B737 flight crew reported loss of a hydraulic system during cruise. Flight crew continued to destination airport

Date: 2026-02 · Aircraft: B737 Undifferentiated or Other Model · Phase: cruise

Anomalies: aircraft-equipment-problem-critical

Synopsis

B737 flight crew reported loss of a hydraulic system during cruise. Flight crew continued to destination airport

Narrative

Leveled in cruise at FL290; we observed a master caution light associated with the hydraulics. We pulled up the hydraulic page on the lower display and saw the system A hydraulic system quantity was at 20%. The preflight inspection upon arrival to the airplane was normal for flight operations. Once the Captain and I realized the situation we ran the appropriate checklist for loss of system A hydraulic. After checklist and briefings were complete minus the differed items checklist to accomplish closer to landing; the Captain informed Dispatch;gave the flight attendants the briefing. We then decided to advise ATC. We requested assistance upon landing to get the airplane checked out as we suspected a hydraulic leak. Manual gear extension was accomplished and acted as it should; as well as normal flight controls. After landing on Runway XXC in ZZZ; emergency vehicles reported smoke from the left main landing gear. Ground personnel monitored the smoke and assured there is no fire and the smoke is dissipating. The trucks followed us to the gate with no leaks during taxi from the hydraulic systems and completed the parking checklist.

Second reporter narrative

During cruise at FL290; master caution light illuminated left hydraulic pump pressure low lights. Hydraulic system A decreased to stand pipe level of 20%. FM checklist Loss of System A was completed; ATC advised; ZZZ Center offered priority landing; but we elected to take normal vectors to a 20 mile final approach in order to manually extend the landing gear and finish the landing checklists. We landed normally on XXC and exited at 1; holding short of 2 on Taxiway 3. Fire/rescue reported light smoke dissipating off the left main wheel; once smoke dissipated with no leak or fire indications; fire trucks followed us safely to the Gate XX. ZZZ Ground gave us priority taxi in. Everyone from ATC and ZZZ fire rescue did a great job! Aircraft was removed from service. After completing company duties adrenaline dropped and following the IMSAFE check; I felt unable to continue trip and the company released us from further duties.

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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.