Is there a manual?

[iniBuilds]

Yes. For PC users:

(Please note these locations may differ if you've chosen a custom install directory for your Package folder.)

Steam:

C:\Users\yournamehere\AppData\Roaming\Microsoft Flight Simulator\Packages\Official\Steam\microsoft-aircraft-a310-300\Resources\Documentation

MS Store Users:

C:\Users\yournamehere\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Official\OneStore\microsoft-aircraft-a310-300\Resources\Documentation

For our Xbox users it is available attached. 

iniBuilds_A310_MSFS_Manual.pdf