A flight crew reported a miscommunication lead the Captain to release the brakes too early while parking at the gate and the aircraft rolled backwards.
Synopsis
A flight crew reported a miscommunication lead the Captain to release the brakes too early while parking at the gate and the aircraft rolled backwards.
Narrative
We had a long day and had done a go around after being set up on a long final and being slowed to 170kts well before turning onto final. Fatigue from the long day and Dodging storms had set in and I stopped configuring in a timely manner and was not fully configured by 1000ft. After the go around and coming back to land we made it to the gate. I stopped and saw the ramper shake his head but I took off my headset not thinking anything of it. Apparently The ramper stopped us too late and then said they needed to push us back into our spot. The FO's head set was still on and heard ramp say they were going to push us back and told me. I then went to grab my headset and the FO said they are ready for brakes. I then got my headset on and released the brakes while saying what I was doing. We started to roll slightly back and the ramper yelled no and I put the brakes back on. There was a miscommunication between the 3 of us. After I put the brakes on again the ramper realized we were now in the proper spot and that was the end of it. I learned that I must be the one in communication ramp and must be the one to hear the commands since I will have control of the brakes. I was also reminded that no matter how long of a day it is I must continue to be vigilant no matter where I am on the ground or in flight.
Second reporter narrative
Events leading up to the incident. Dodging thunderstorms through out the flight. Extremely congested frequencies with approach; and then finally getting on a long final approach at 170 knots assigned until ZZZZZ; we had flaps 2. Given we were ending our day and on the long final; our flows were a messed up and we needed to execute a go around due to configuration. As we came back around and got on the ground; we approached the gate. Once we were there and parking brake set; we began our flows. Captain had their head set off and right before I removed mine I saw ramp waving their arms and I quickly called in. They said I need to push you back; they marshaled us in too far. I repeated this back to them; and the Captain heard me say this. Ramp then asked if we were ready. I asked if he was ready for brakes while the Captain was grabbing their head set. I asked ramp if they were ready. Because the tone of my voice while talking with the ramp the Captain believed the ramp was ready; not that I was confirming with ramp to see if they were. Tthe brakes were released and we rolled back to the point were needed to be at. However; all through the confusion it worked out; it brought up the issues of me as a FO should have told ramp to stand by until the Captain was ready to join and lead the conversation. Do not converse with ramp until we both are listening in specially when it is in regards to movement
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.