A300 flight crew reported the number 2 engine stuck in full reverse and parking brake failure at gate resulted in uncommanded movement.
Synopsis
A300 flight crew reported the number 2 engine stuck in full reverse and parking brake failure at gate resulted in uncommanded movement.
Narrative
After landing in ZZZ; the number two reverser failed to stow and was stuck in full reverse. We taxied clear of the runway and most of the way back to the ramp and then decided to shutdown the number 2 engine prior to turning into the gate because we were over 290k lbs gross weight and it was difficult to taxi and I also did not want the reverser throwing stuff in all of the rampers. Shutdown went fine and I continued to taxi in. I distinctly remember looking at the brake accumulator to make sure it was charged just in case something weird happened with the number 2 engine shutdown. It showed in the green band. After taxiing in and getting the stop signal I set the parking brake. The F/O noticed we were starting to roll. I stomped on the brakes and got no response and we were continuing to roll so I went reverse in the number 1; released the parking brake and then reapplied the brakes. The aircraft stopped so I stowed the reverser and stood on the brakes until maintenance was able to chock the aircraft. We did not hit anything and luckily no one on the ground was injured. The rest of the shutdown was uneventful and then maintenance pushed us back into the spot. In ZZZ1 before we departed; while doing the preflight brake test; it would fail to pressurize the brakes past 900 (2000-2700 is the good range) and the accumulator would deplete immediately. We called out mx (Maintenance) and they bled the system and it checked good; but obviously did not stay good. I messed up by failing to write it up since mx fixed the issue quickly and acted like they prefer I not write it up as well as we were already running behind due to several other factors. Obviously it would not have changed the outcome because I still would have taken the jet after they fixed" it and it checked good; but it would have had the proper mx history after our subsequent event; so lesson learned.Cause: Parking brake failureSuggestions: I guess since we had a brake issue before we left and then subsequently had to shut down the number two I should have shutdown in the alley and made them tow us in. Like I said; I did check the accumulator but shouldn't have trusted it."
Second reporter narrative
After landing on runway XX in ZZZ; the number 2 thrust reverser would not stow and was stuck in full reverse. After taxiing clear of the runway and onto the ramp; we stopped the jet and shut down the number two engine because it was difficult to taxi at 290;000 pounds with the reverser open. We also did not want to taxi into the gate with full reverse. We checked the accumulator for the parking brake to make sure it had pressure because we had trouble with it on the preflight in ZZZ1 however we were able to resolve it in ZZZ1 after calling Maintenance. After shutting down the engine; we continued to taxi into the gate and after setting the parking brake; the aircraft began to roll forward and wasn't stopping. The captain quickly went full reverse on the number 1 engine; released the parking brake handle; and we both stomped on the brake pedals and brought the jet to a stop without hitting anything or injuring anyone. ZZZ maintenance then chocked us and hooked a tug up to push us back into the parking spot with no further incident.Cause: The combination of shutting down the number two engine due to the thrust reverser not stowing and the failure of the brake accumulator led to this event.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.