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Air carrier large transport rolled into jetway because when the parking brakes were set there was no hydraulic pressure.
| Attributes | |
| ACN | 146657 |
| Time | |
| Date | 199005 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : cmh |
| State Reference | OH |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 8000 flight time type : 500 |
| ASRS Report | 146657 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : flight engineer pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 260 flight time total : 6500 flight time type : 4000 |
| ASRS Report | 146679 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Ground time of approximately 1 hour 20 mins. APU secured, external electrical power wouldn't stay on line so electric hydraulic pumps turned off. 15 mins prior to pushback the 'brakes set' signal was given by ground crewman, and parking brake was set at that time. Halfway through 'through flight ' checklist the aircraft moved and contacted jetway. No passenger were present in jetway. Door was written up in the logbook and maintenance found no defects. The aircraft rolled because, although the parking brake was set, the hydraulic pressure had bled off during our ground time. My procedure now is to always check the brake pressure gauge when setting the parking brake.
Original NASA ASRS Text
Title: ACR LGT ROLLED INTO JETWAY BECAUSE WHEN THE PARKING BRAKES WERE SET THERE WAS NO HYDRAULIC PRESSURE.
Narrative: GND TIME OF APPROX 1 HR 20 MINS. APU SECURED, EXTERNAL ELECTRICAL PWR WOULDN'T STAY ON LINE SO ELECTRIC HYD PUMPS TURNED OFF. 15 MINS PRIOR TO PUSHBACK THE 'BRAKES SET' SIGNAL WAS GIVEN BY GND CREWMAN, AND PARKING BRAKE WAS SET AT THAT TIME. HALFWAY THROUGH 'THROUGH FLT ' CHKLIST THE ACFT MOVED AND CONTACTED JETWAY. NO PAX WERE PRESENT IN JETWAY. DOOR WAS WRITTEN UP IN THE LOGBOOK AND MAINT FOUND NO DEFECTS. THE ACFT ROLLED BECAUSE, ALTHOUGH THE PARKING BRAKE WAS SET, THE HYD PRESSURE HAD BLED OFF DURING OUR GND TIME. MY PROC NOW IS TO ALWAYS CHK THE BRAKE PRESSURE GAUGE WHEN SETTING THE PARKING BRAKE.
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.