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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.
| Attributes | |
| ACN | 1750397 |
| Time | |
| Date | 202007 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach Initial Approach |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Hydraulic System |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 90 Flight Crew Total 7500 Flight Crew Type 2000 |
| Person 2 | |
| Function | Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 138 Flight Crew Total 20000 Flight Crew Type 600 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Deviation - Speed All Types |
Narrative:
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.
Original NASA ASRS Text
Title: 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.
Narrative: 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.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.