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Captain reported their disabled checklist for loss of center (C) hydraulic system quantity and pressure directed the pilot to select an air driven (demand) pump (adp) on B777 aircraft. The electronic checklist logic stopped the continuation of the disabled checklist due to a momentary spike in the 'C' system pressure. As a result; the center system hyd pumps were left on even with the center hyd quantity and pressure at zero.
| Attributes | |
| ACN | 1289022 |
| Time | |
| Date | 201508 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZZ.Airport |
| State Reference | FO |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Landing |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Hydraulic Main System |
| Person 1 | |
| Function | Captain Pilot Flying |
| Experience | Flight Crew Total 24000 Flight Crew Type 1197 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
Lost center [C] hydraulic system quantity and pressure after landing gear and flap extension on final approach. I deemed it safer to land than to go around. My crew agreed. We accomplished associated checklists on the ground. Of note regarding the checklists; the hydraulic press system 'C' checklist yielded an unexpected result. The system evidently sensed at least momentary valid [hyd] pressure after we turned on an air [driven] demand pump. We infer this because the remaining checklist actions were disabled by the electronic checklist logic. However; the center electric and [air driven] hyd demand pumps all showed faults on the overhead panel. While we might have missed a momentary pressure fluctuation on the hydraulic system synoptic [page]; for all intents and purposes the synoptic quantity and pressure remained at zero for the center hydraulic system. The disabled checklist items would have directed us to secure all the hydraulic pumps. This was not done and the pumps operated absent indicated hydraulic quantity and pressure for over 40-minutes. Aircraft system malfunction hydraulic power.
Original NASA ASRS Text
Title: Captain reported their Disabled Checklist for loss of Center (C) Hydraulic System quantity and pressure directed the pilot to select an Air Driven (Demand) Pump (ADP) on B777 aircraft. The Electronic Checklist logic stopped the continuation of the Disabled checklist due to a momentary spike in the 'C' System pressure. As a result; the Center System hyd pumps were left on even with the Center Hyd quantity and pressure at zero.
Narrative: Lost Center [C] Hydraulic System quantity and pressure after landing gear and flap extension on final approach. I deemed it safer to land than to go around. My crew agreed. We accomplished associated checklists on the ground. Of note regarding the checklists; the HYD PRESS SYS 'C' Checklist yielded an unexpected result. The system evidently sensed at least momentary valid [hyd] pressure after we turned on an AIR [Driven] DEMAND pump. We infer this because the remaining checklist actions were disabled by the Electronic Checklist logic. However; the Center Electric and [Air Driven] Hyd Demand pumps all showed faults on the Overhead panel. While we might have missed a momentary pressure fluctuation on the Hydraulic System Synoptic [page]; for all intents and purposes the synoptic quantity and pressure remained at zero for the Center Hydraulic System. The Disabled checklist items would have directed us to secure all the hydraulic pumps. This was not done and the pumps operated absent indicated hydraulic quantity and pressure for over 40-minutes. Aircraft System Malfunction Hydraulic Power.
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.