B737 flight crew reported receiving a hydraulic system low pressure master caution during cruise; followed by additional system malfunction lights. Flight crew diverted and landed safely.
Synopsis
B737 flight crew reported receiving a hydraulic system low pressure master caution during cruise; followed by additional system malfunction lights. Flight crew diverted and landed safely.
Narrative
It began with low pressure light in Eng 2 hydraulic pump followed by the low pressure light in the associated Electrical hydraulic pump. Ran procedures for the Hydraulic pump low pressure. This was followed by the low pressure light for Flight control B. Followed the procedures for the for this malfunction which led to activating the Stby Rudder system. At this point we had a chance to bring up the hydraulic page and could see we had Zero Quantity in the B hydraulic system. We conferred with Dispatch and Maintenance Control as it was unfolding. We [requested priority handling] and diverted to ZZZ rather than continue to ZZZ1. We ran the checklist for loss of system B hydraulic system. We coordinated a plan with Dispatch and ATC to proceed to ZZZ. We communicated the plan with the Flight Attendants and passengers and prepared for a Flaps 15 landing and alternate flap extention while reviewing the systems lost to us on the ground. Once on the ground had the Airport Rescue and Firefighting (ARFF) look over the aircraft on the taxi way. They confirmed fluid dripping from the engine and a little bit of associated white smoke. We shut that engine down and had them follow us to the gate. No further significant activity.
Second reporter narrative
While cruising at FL 370; we got a master caution with an engine 2 hydraulic system low pressure light. We consulted the HYDRAULIC PUMP LOW PRESSURE non normal; which directed us to turn off the pump. Upon doing so we got the associated intermittent ELEC 1 LOW PRESSURE light. Concurrently; the FLIGHT CONTROL B LOW PRESSURE KIGHT CAME ON; as well as the FEEL DIFFERENTIAL PRESSURE and the YAW DAMPER LOW PRESSURE LIGHT. We followed the FLIGHT CONTROL LOW PRESSURE procedure which directed us to select FLIGHT CONTROL B to STBY RUDDER. The Captain turned over the controls and radios to me while he contacted maintenance and the dispatcher. We then selected the SYS page and noted that there was 0 hydraulic fluid quantity in system B. After a discussion with maintenance we elected to [request priority handling]; and because of the weather and the proximity to ZZZ; we initiated a divert to ZZZ. During the diversion we ran the LOSS OF SYSTEM B non normal; which directed us to turn off the electric pump and eventually drove us into alternate flap extension. We coordinated a landing on Runway XXC with the fire equipment standing by. The approach happened smoothly according to the non normal procedure. After landing Airport Rescue and Firefighting (ARFF) noted that there was fluid leaking from the right engine and light smoke. We shut down the right engine and taxied to the gate and shut down; where maintenance met us.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.