A320
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Communication Breakdown
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Human Factors
At door closure; ramp agents informed us a fastener was not secure. I notified Mx (Maintenance) and they stated they'd send line Mx out. Line secured the fastener. We then pushed. We received a message airborne that we had left with the aircraft Out of service. I took full responsibility and apologized to dispatch - we simply had not been informed that we had been taken OTS (Out of Service); but I should have assumed so and contacted dispatch. We already had our performance solution so we had no communication or indication that we were OTS.Communication from Mx or dispatch that the aircraft was OTS would have avoided this; but I take full responsibility for not coordinating through Dispatch.
On pushback the ground crew noticed a fastener loose. We called Mx (Maintenance) and they walked out and tightened the fastener. We asked if they wanted it in the book and they said no and that we where good to go. We headed out and after takeoff dispatch sent us a message asking why we took off while out of service. We had no idea we were taken out of service and no message was sent to us saying we were being taken out of service. I think if someone is taking a plane out of service that a message needs to be sent. We had already gotten performance numbers so that fail safe was unusable.
Aircraft departed after it was removed from service due to maintenance work.