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A B757 experiences a hydraulic failure leaving the flight crew with only accumulator to stop the aircraft.
| Attributes | |
| ACN | 589205 |
| Time | |
| Date | 200307 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : taxi ground : holding |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 110 flight time total : 13000 flight time type : 3000 |
| ASRS Report | 589205 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe conflict : ground less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control flight crew : took precautionary avoidance action |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Aircraft pushed back from gate. Engines started, parking brake set. Received status message (power xfer unit). During procedure to clear message light, aircraft began to creep forward. As PIC, I released parking brake and used foot pedals and brake accumulator pressure to stop just short of a parked aircraft. When stopped, engines were shut down. Crash fire rescue equipment called just in case. Maintenance arrived and towed aircraft to gate. After logbook write-up completed, aircraft was towed to hangar. Aircraft had just returned from maintenance hangar. Prior to this event. All crew checklists and procedures complied with prior to and after this event. As of this time, no specific cause for brake loss found by maintenance. Redundancy of system -- normal brake system and secondary system -- proved very important in aircraft design in this event.
Original NASA ASRS Text
Title: A B757 EXPERIENCES A HYD FAILURE LEAVING THE FLT CREW WITH ONLY ACCUMULATOR TO STOP THE ACFT.
Narrative: ACFT PUSHED BACK FROM GATE. ENGS STARTED, PARKING BRAKE SET. RECEIVED STATUS MESSAGE (PWR XFER UNIT). DURING PROC TO CLR MESSAGE LIGHT, ACFT BEGAN TO CREEP FORWARD. AS PIC, I RELEASED PARKING BRAKE AND USED FOOT PEDALS AND BRAKE ACCUMULATOR PRESSURE TO STOP JUST SHORT OF A PARKED ACFT. WHEN STOPPED, ENGS WERE SHUT DOWN. CFR CALLED JUST IN CASE. MAINT ARRIVED AND TOWED ACFT TO GATE. AFTER LOGBOOK WRITE-UP COMPLETED, ACFT WAS TOWED TO HANGAR. ACFT HAD JUST RETURNED FROM MAINT HANGAR. PRIOR TO THIS EVENT. ALL CREW CHKLISTS AND PROCS COMPLIED WITH PRIOR TO AND AFTER THIS EVENT. AS OF THIS TIME, NO SPECIFIC CAUSE FOR BRAKE LOSS FOUND BY MAINT. REDUNDANCY OF SYS -- NORMAL BRAKE SYS AND SECONDARY SYS -- PROVED VERY IMPORTANT IN ACFT DESIGN IN THIS EVENT.
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.