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A MD80's right hydraulic system twice had system pressure decrease to zero with normal quantity then return to normal. An emergency was declared followed by normal gear and flap extension. Maintenance thought pressurized air in the hydraulic reservoir was the problem.
| Attributes | |
| ACN | 900953 |
| Time | |
| Date | 201007 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Component | |
| Aircraft Component | Hydraulic Syst Reservoir Tank |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
When we started our descent; the 'rt system hydraulic press low' (right system hydraulic pressure low) warning message illuminated. Pressure was zero and quantity was slightly high. During the checklist procedure; the system pressure was restored; or restored itself. We continued to our destination and the hydraulic pressure went to zero when we extended the gear. The pressure once again restored itself; the gear and flaps were extended normally. We requested priority handling; but did not actually declare an emergency. We asked for the right runway as it was longer than the left and informed the tower that we had a hydraulic problem. We were met by the fire trucks and followed to the gate. The landing was normal and uneventful. At the gate maintenance suspected that air in both tanks was giving false indications; and told us that both left and right systems were at 'refill.' I entered 'yes' in the declared emergency block as we requested priority handling and was met by the fire department.
Original NASA ASRS Text
Title: A MD80's right hydraulic system twice had system pressure decrease to zero with normal quantity then return to normal. An emergency was declared followed by normal gear and flap extension. Maintenance thought pressurized air in the hydraulic reservoir was the problem.
Narrative: When we started our descent; the 'RT SYS HYD PRESS LOW' (right system hydraulic pressure low) warning message illuminated. Pressure was zero and quantity was slightly high. During the checklist procedure; the system pressure was restored; or restored itself. We continued to our destination and the hydraulic pressure went to zero when we extended the gear. The pressure once again restored itself; the gear and flaps were extended normally. We requested priority handling; but did not actually declare an emergency. We asked for the right runway as it was longer than the left and informed the Tower that we had a hydraulic problem. We were met by the fire trucks and followed to the gate. The landing was normal and uneventful. At the gate maintenance suspected that air in both tanks was giving false indications; and told us that both left and right systems were at 'refill.' I entered 'yes' in the declared emergency block as we requested priority handling and was met by the fire department.
Data retrieved from NASA's ASRS site as of April 2012 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.