MD-11
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 90; Flight Crew Total 7500; Flight Crew Type 2000
Workload; Troubleshooting
Aircraft Equipment Problem Critical; Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Landed in Emergency Condition
Aircraft
We had a hydraulic failure in system one. Because of this failure our Minimum Control Speed was computed at 160 which was 10 knots faster than our approach speed. We were unable to get to our desired landing flap setting of 35 until we were able to slow down just prior to landing. Even with the GPWS flap override selected; we still got GPWS WARNING calls. We were stable on the ILS and VASI and we knew why we were getting the GPWS calls which were not due to terrain. I continued the approach to an uneventful landing.
We had a level one 'hyd 1 off' light illuminate. We ran the QRH checklist and discussed our options. Weather at destination was good; clear and winds 180 at 10 knots gust to 15 knots. According to the QRH; there was a possibility of a level 2 HYD 1 fail during configuration which we discussed and planned for. We received the level 2 HYD 1 fail at slat extension and we had already familiarized ourselves with the level two 'hyd 1 fail' from the QRH while enroute and knew that the only consequence would be no auto-brakes upon landing and that landing flaps may not be achieved until speed was reduced. We reviewed the Hydraulic synoptic consequence page which notified us that the upper rudder was inop and Minimum Control Speed would be 160 knots. We adjusted our approach speed from 150 to 160 knots. When selecting flaps 35 for landing; it took longer than usual for the flaps to move to selected position so we began configuring about 25 miles out. The Captain requested that I move the flap override to override so we wouldn't get any distractions. I then turned over control to the Captain who landed without incident. The flaps eventually got down to 35 degrees prior to an uneventful landing.
Air carrier flight crew reported receiving a GPWS warning due to flap settings and high final approach speed required by the loss of Hydraulic Pressure in one system.