The speed limit at the affected road stretch indeed seems off (there's nothing there that should warrant a 50 km/h limit instead of the indicated 60), and to make matters even funnier, sometimes the GPS shows a limit of 80 km/h when turning to the road from the airport building. I filed the issue as #27997. Thank you for your report!
![Wink ;)](./images/smilies/icon_e_wink.gif)