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A DC9 on descent at 10000 ft lost the right hydraulic system pressure and quantity due to massive leak in the rudder power unit.
| Attributes | |
| ACN | 375919 |
| Time | |
| Date | 199708 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mem |
| State Reference | TN |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach descent other |
| Route In Use | enroute airway : mem |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 9500 flight time type : 5500 |
| ASRS Report | 375919 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 7600 flight time type : 1600 |
| ASRS Report | 375918 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa other other : unspecified cockpit |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
When hydraulic pumps selected to high, during descent flow, right hydraulic pressure went to 0 psi following a loss of right hydraulic fluid. Followed company cockpit operating manual procedures for loss of right hydraulic system. Landing was uneventful. Callback conversation with reporter revealed the following information: reporter stated when the right engine pump was switched to high the pressure and quantity dropped to zero. The reporter advised the hydraulic loss was caused by a massive leak in the rudder power unit.
Original NASA ASRS Text
Title: A DC9 ON DSCNT AT 10000 FT LOST THE R HYD SYS PRESSURE AND QUANTITY DUE TO MASSIVE LEAK IN THE RUDDER PWR UNIT.
Narrative: WHEN HYD PUMPS SELECTED TO HIGH, DURING DSCNT FLOW, R HYD PRESSURE WENT TO 0 PSI FOLLOWING A LOSS OF R HYD FLUID. FOLLOWED COMPANY COCKPIT OPERATING MANUAL PROCS FOR LOSS OF R HYD SYS. LNDG WAS UNEVENTFUL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED WHEN THE R ENG PUMP WAS SWITCHED TO HIGH THE PRESSURE AND QUANTITY DROPPED TO ZERO. THE RPTR ADVISED THE HYD LOSS WAS CAUSED BY A MASSIVE LEAK IN THE RUDDER PWR UNIT.
Data retrieved from NASA's ASRS site as of July 2007 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.