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B737NG flight crew reported the aircraft rolled about 15 yards on the parking pad after the brake accumulator apparently lost pressure.
| Attributes | |
| ACN | 1548481 |
| Time | |
| Date | 201806 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Parking Brake |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Total 5189 Flight Crew Type 718 |
| Person 2 | |
| Function | First Officer |
| Experience | Flight Crew Type 976.08 |
| Events | |
| Anomaly | Conflict Ground Conflict Critical Deviation - Procedural Published Material / Policy Ground Event / Encounter Loss Of Aircraft Control |
Narrative:
While sitting on remote tarmac awaiting fueling during a diversion; the aircraft rolled forward approximately 15 yards. The parking brake was set after we landed and taxied to remote ramp. The parking brake had been set approximately 30 to 45 minutes before aircraft started to move. When aircraft started to move; parking brake was still set and red light was illuminated. Simultaneously; there was a call from operations heard over the speakers and a deadheading pilot noticed the aircraft moving. I (captain) was in the cockpit but not in the seat. The first officer was in the cabin in line for the forward lav. Once I became aware of movement; I jumped into the seat; noticed the parking brake was set with light on and applied the brakes. However; the pressure gage was in the yellow. I also yelled out that the plane was moving. The first officer returned to the cockpit and placed electric pump switches on. It appears that upon further review; we were parked on a part of the pad that was sloping down to a drainage section of the ramp. This slope was hard to see from the cockpit. Aircraft came to an abrupt halt.
Original NASA ASRS Text
Title: B737NG flight crew reported the aircraft rolled about 15 yards on the parking pad after the brake accumulator apparently lost pressure.
Narrative: While sitting on remote TARMAC awaiting fueling during a diversion; the aircraft rolled forward approximately 15 yards. The parking brake was set after we landed and taxied to remote ramp. The parking brake had been set approximately 30 to 45 minutes before aircraft started to move. When aircraft started to move; parking brake was still set and red light was illuminated. Simultaneously; there was a call from operations heard over the speakers and a deadheading pilot noticed the aircraft moving. I (Captain) was in the cockpit but not in the seat. The First Officer was in the cabin in line for the forward lav. Once I became aware of movement; I jumped into the seat; noticed the parking brake was set with light on and applied the brakes. However; the pressure gage was in the yellow. I also yelled out that the plane was moving. The First Officer returned to the cockpit and placed electric pump switches on. It appears that upon further review; we were parked on a part of the pad that was sloping down to a drainage section of the ramp. This slope was hard to see from the cockpit. Aircraft came to an abrupt halt.
Data retrieved from NASA's ASRS site 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.