While converting MSN 50180, DC-10-30ER Reg No G-DYFA to an A340-300, I get the error message that LHR is closed at the arrival time. Manually converting routes 609960 (LHR-EZE-LHR) and 543015 (LHR-DIG-MEL-DIG-LHR) show arrival times of 0600 and 2250 respectively, both within LHR's curfew hours.
Edit 2: It seems this may be related to tech stops. MSN 50407 also gives me an error about LHR being closed yet the earliest arrival for any flight is 0725. In both cases, there are two tech stop flight assigned to the aircraft.
Another error associated with tech stops.
GW2 DC-10-30 MSN 47491 G-DZLA. Route 495145 LHR-KHI-PER-KHI-LHR creates an "overlap" preventing the line from being converted. Manually converting the route keeps the same arrival time of 0720, next flight departs at 0920. Error reads:
Cannot assign this route for this aircraft. The route would overlap another flight or maintenance check already in the schedule.
Please assign the route to another aircraft or change the route days or departure times.
The (first) overlap is at Th / 09:20.
Maintain Original Departure Time checked.
Edit: I would be willing to bet the issue is the routes turn time being applied to the tech stop instead of a 90 minute turn. In both cases it makes sense, the first error being the flight arrives while the airport is closed and the second causing an overlap. If 90 minutes is used at the tech stop, it works. If 150 or 120 minutes is used, it causes the respective errors. In addition, I had no problem transferring tech stop flights from DC-8 to L1011 in GW1 where the extra speed of the L1011 would easily cover the additional time spent at the tech stop.