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Air carrier large transport lost hydraulic quantity at cruise altitude. Aircraft continued for normal landing using ground emergency equipment as a standby.
| Attributes | |
| ACN | 129810 |
| Time | |
| Date | 198912 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 23000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tracon : ord tower : ord tower : lga |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 250 flight time total : 3000 flight time type : 700 |
| ASRS Report | 129810 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem flight crew : declared emergency |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Second officer noticed loss of hydraulic qty system a. Completed immediate actions with the captain and began going through irregular procedures. There was enough pressure in the lines to get the gear down normally. Alternate flap extension was conducted first, to preserve the pressure in the lines for gear extension. The head F/a was called to cockpit and briefed. The passenger were briefed for the landing. No nose wheel steering was anticipated. The pumps were left off to preserve pressure in the lines. Company maintenance was called and notified. Emergency equipment for an amber alert was prepared on the ground. At 300', the command to 'brace' was given, and the a-pumps for NWS was turned on. The crew completed a normal landing, and were able to taxi to the gate west/O assistance. Leftover pressure was minimal. The crew conducted themselves professionally and as a team in a tense situation.
Original NASA ASRS Text
Title: ACR LGT LOST HYDRAULIC QUANTITY AT CRUISE ALT. ACFT CONTINUED FOR NORMAL LNDG USING GND EMERGENCY EQUIPMENT AS A STANDBY.
Narrative: S/O NOTICED LOSS OF HYD QTY SYS A. COMPLETED IMMEDIATE ACTIONS WITH THE CAPT AND BEGAN GOING THROUGH IRREGULAR PROCS. THERE WAS ENOUGH PRESSURE IN THE LINES TO GET THE GEAR DOWN NORMALLY. ALTERNATE FLAP EXTENSION WAS CONDUCTED FIRST, TO PRESERVE THE PRESSURE IN THE LINES FOR GEAR EXTENSION. THE HEAD F/A WAS CALLED TO COCKPIT AND BRIEFED. THE PAX WERE BRIEFED FOR THE LNDG. NO NOSE WHEEL STEERING WAS ANTICIPATED. THE PUMPS WERE LEFT OFF TO PRESERVE PRESSURE IN THE LINES. COMPANY MAINT WAS CALLED AND NOTIFIED. EMER EQUIP FOR AN AMBER ALERT WAS PREPARED ON THE GND. AT 300', THE COMMAND TO 'BRACE' WAS GIVEN, AND THE A-PUMPS FOR NWS WAS TURNED ON. THE CREW COMPLETED A NORMAL LNDG, AND WERE ABLE TO TAXI TO THE GATE W/O ASSISTANCE. LEFTOVER PRESSURE WAS MINIMAL. THE CREW CONDUCTED THEMSELVES PROFESSIONALLY AND AS A TEAM IN A TENSE SITUATION.
Data retrieved from NASA's ASRS site as of August 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.