A330
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Situational Awareness; Workload; Time Pressure
Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR
Human Factors
In ZZZZ to do ground check and flight check on Aircraft X coming out of heavy check. Ground checks were completed on day one with discrepancies recorded and addressed in the Aircraft Maintenance Logbook (AML). The functional check flight was completed on the second day with discrepancies again recorded and addressed in the AML. We planned to ferry the aircraft to ZZZ once the discrepancies were addressed. Our arrival time in ZZZ was close to the closing time of ZZZ customs so there was some time pressure to get us in the air. We were in the flight deck ready to go when the AML arrived. The Maintenance representative reviewed the logbook entries with us. Unfortunately; we focused on the discrepancies and overlooked the lack of an airworthiness release signature. We discovered this later in the flight. Upon arrival in ZZZ we contacted Maintenance to address the situation.Crew and Maintenance was trying us to get airborne to get to ZZZ for customs. Airworthiness release signature got overlooked by everyone. Time pressures.When you are getting rushed; it is time to slow down and take a deep breath. Of course all the individuals involved will be double checking these items in the future.
Aircraft X completed a 1S check in ZZZZ. Per company policy a Functional Check Flight (FCF) is required prior to an airworthiness release for this check type. An FCF was accomplished; and after the repair to 3 items found on the FCF there was a need to dispatch the aircraft to ZZZ prior to the closure of customs. The aircraft repositioned without an airworthiness release for the 1S check and the FCF. I informed my Manager and MOD (Manager on Duty) and it was decided the procedure in the Company Maintenance Manual for a Missing Airworthiness Release applied. ZZZ was contacted and the procedure was followed prior to the release of the aircraft for revenue service.Trying to dispatch an aircraft from an international location to meet a customs closure deadline in ZZZ. Slow down and take the time to verify the paperwork.
A330 flight crew and Maintenance reported overlooking airworthiness sign-off after Maintenance visit.