B737 air carrier flight crew reported loss of hydraulics on descent. Flight crew landed uneventfully at destination.
Synopsis
B737 air carrier flight crew reported loss of hydraulics on descent. Flight crew landed uneventfully at destination.
Narrative
During arrival and approach to land we had been deviating around thunderstorms. Just past ZZZZZ; and on course; we were slowing the aircraft and selected flaps 1 on arrival and approaching ZZZZZ1 on the RNAV RWY XX. We experienced a MASTER CAUTION and HYD Annunciator message. At that moment we had a Hydraulic B engine driven pump LOW PRESSURE light illuminated on the overhead panel. We also looked at the lower display unit and saw that our HYD B quantity was at 0; We followed the QRH procedures and turned off the HYD B Engine driven pump. Moments later we then received a Hyd B ELEC Pump LOW PRESSURE light along with a FLT CONTROL B LOW PRESSURE light. Knowing that we then had a loss of HYD B system I [requested priority handling]. At that point I referenced the QRH of LOSS OF SYSTEM B hydraulics (the FO was PF). As events unfolded; we wanted to slow the aircraft and extended flaps 5. We also put the gear down and selected flaps 15. At this point we were past ZZZZZ1 and on an approximately 8-10 mile final descending and slowing. I referenced the LOSS OF SYSTEM B hydraulics and ensured we had ample runway available with the aircraft configuration. Made a reference to the list of the inoperative items. And made the determination to land with the runway insight. I made the determination to continue the approach and land while considering the condition of the aircraft; the terrain of the surrounding airport; and thunderstorms in the proximity of the area and felt our (my) considerations had the greatest margin of safety for safely landing under the conditions. As part of my considerations; I determined that it was the safest course of action to continue the approach without completing the entire QRH procedure for the LOSS OF SYSTEM B hydraulics. Our flaps were selected to 15 but because of the loss of system B they only extended to approximately 12-13 degrees. I determined with reference to the landing data that without the extra 2-3 degrees would still safely allow us ample landing distance. I took control of the aircraft and landed. We were met by airport emergency equipment. We taxied to the gate and deplaned uneventfully. Cause: We had a loss of hydraulic B system while on arrival into approach. We had been flying around thunderstorms and into an airport that had terrain considerations. Because of where the event occurred (as far as where we were on the approach; altitude and airspeed) we had very little time to make decisions. And my decision was the safest course of action was to continue and land as we were a priority aircraft flying into and airport that was terrain challenged and had thunderstorms in the area. The weather forecasts were also calling for the weather to move over the field.
Second reporter narrative
On the approach to Runway XX (RNAV XX) and just approximately 3 miles prior to the final approach fix; while configuring for flaps ; The MASTER CAUTION and HYD Annunciator came on. Initially hydraulic B engine driven pump; LOW PRESSURE lights illuminated . Upon looking at the lower display unit we saw HYD B quantity was indicating zero. As per QRH; the B engine driven pump was turned off.After this we got HYD B ELEC Pump LOW followed by FLT CONTROL B LOW PRESSURE light.(loss of B Sys).I the PF continued flying to aircraft while the PM( CPT) [requested priority handling] and following QRH. We landed with Flaps Approximately 13 degrees uneventfully .Cause: Due to the circumstances of weather and terrain; we decided to continue; and due to first officer restrictions ; the captain landed the Aircraft uneventfully.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.