B737 First Officer reported a hydraulic system malfunction during the climb to cruise altitude. The flight diverted to an alternate airport and landed.
Synopsis
B737 First Officer reported a hydraulic system malfunction during the climb to cruise altitude. The flight diverted to an alternate airport and landed.
Narrative
Climbing through FL210 the number 2 engine hydraulic low pressure light illuminated. QRH was complied with. We monitored quantity and pressure at this time they both indicated normal with the exception of B system shot up to 106%. In the meantime we started to review loss of hydraulic B system QRH just in case. When we were just about at cruise altitude the B quantity slowly went to 0. FO flew aircraft while CA worked with ATC; flight attendants; and tried to communicate with maint/dispatch through the call me prompt and the radios. Communications were very difficult due to static on the radio but indicated we were going to divert. We were roughly 80 miles from ZZZ so [requested priority handling] and started descent into ZZZ. While CA was coordinating; FO got weather and set up for approach. CA completed initial portion of loss of B hydraulics down to deferred item. Once everything was completed CA briefed approach and requested aircraft back for landing. FO completed Loss of B hydraulics system checklist. Extended the flaps via alternate flap switch to 15 per the QRH. Fully configured at least ten miles out to land on runway XX. No issues on landing. Exited runway and taxied to the gate.
Second reporter narrative
Normal hydraulic system quantities were observed during flight deck preflight prior to departure. Passing FL210 in climb from ZZZ1 en route to ZZZ2 in VMC; the LOW PRESSURE caution for Engine 2 EDP (Engine Driven Pump) (System B) illuminated. QRH was completed and no other anomalies were noted. Flight crew elected to continue. As a precaution; the QRH for LOSS OF SYS B was reviewed. Just prior to level off at FL370; the system B hydraulic quantity was observed at 106% and then steadily depleted to 0%. Pressure remained normal briefly and then bled to zero. We [requested priority handling] and the QRH for LOSS OF SYS B was actioned. Notifications to dispatch and maintenance were made via VHF. It should be noted the Call Me frequency west of ZZZ was not clear and impeded communications. It was agreed that a diversion to ZZZ was appropriate. The Flight Attendants were notified and given appropriate brief items and then the passengers were notified. An uneventful landing at ZZZ occurred. The aircraft was taxied to the gate with no other anomalies noted. A mechanic confirmed hydraulic fluid leaking from the right side of the aircraft.
More incidents for this aircraft family →
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.