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A DC9-30 on descent at 16000 ft declared an emergency due to left hydraulic system failure, lights and indication. Per checklist when left hydraulics switched back on system returned to normal.
| Attributes | |
| ACN | 441193 |
| Time | |
| Date | 199906 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : day.airport |
| State Reference | OH |
| Altitude | msl single value : 16000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d10.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 100 flight time total : 9000 flight time type : 700 |
| ASRS Report | 441193 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : hyd. system indicators |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : declared emergency |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
In descent passing approximately 16000 ft MSL left thrust reverser low light illuminated. This was immediately followed by a left hydraulic pressure low light. Left hydraulic system pressure was noted at 700 psi and decreasing. Left hydraulic quantity was noted at zero. Performed hydraulic pressure low/or fluid loss checklist. Also performed landing procedure, right hydraulic system normal checklist. Had dispatch compute landing data. Dispatch notified maintenance control. Declared emergency with approach control. Landed on longest runway available (runway 21R). Per checklist, restored left system prior to landing when switches turned back on system returned to normal, and quantity gauge returned to about 12 quarts. Uneventful normal landing and taxi to gate. Callback conversation with reporter revealed the following information: the reporter stated it was a false warning because at the gate everything checked ok, no visible leaks, reservoir was full and pressure normal. The reporter said nothing was heard from maintenance on the corrective action.
Original NASA ASRS Text
Title: A DC9-30 ON DSCNT AT 16000 FT DECLARED AN EMER DUE TO L HYD SYS FAILURE, LIGHTS AND INDICATION. PER CHKLIST WHEN L HYDS SWITCHED BACK ON SYS RETURNED TO NORMAL.
Narrative: IN DSCNT PASSING APPROX 16000 FT MSL L THRUST REVERSER LOW LIGHT ILLUMINATED. THIS WAS IMMEDIATELY FOLLOWED BY A L HYD PRESSURE LOW LIGHT. L HYD SYS PRESSURE WAS NOTED AT 700 PSI AND DECREASING. L HYD QUANTITY WAS NOTED AT ZERO. PERFORMED HYD PRESSURE LOW/OR FLUID LOSS CHKLIST. ALSO PERFORMED LNDG PROC, R HYD SYS NORMAL CHKLIST. HAD DISPATCH COMPUTE LNDG DATA. DISPATCH NOTIFIED MAINT CTL. DECLARED EMER WITH APCH CTL. LANDED ON LONGEST RWY AVAILABLE (RWY 21R). PER CHKLIST, RESTORED L SYS PRIOR TO LNDG WHEN SWITCHES TURNED BACK ON SYS RETURNED TO NORMAL, AND QUANTITY GAUGE RETURNED TO ABOUT 12 QUARTS. UNEVENTFUL NORMAL LNDG AND TAXI TO GATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED IT WAS A FALSE WARNING BECAUSE AT THE GATE EVERYTHING CHKED OK, NO VISIBLE LEAKS, RESERVOIR WAS FULL AND PRESSURE NORMAL. THE RPTR SAID NOTHING WAS HEARD FROM MAINT ON THE CORRECTIVE ACTION.
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.