Flying VTOL must do piloting roll to avoid bugging down in mud

[mwberlindeu]

###Environment
MekHQ version: 49.6

###Description
A piloting check was requested for a flying VTOL to avoid bogging down in mud

Files

(Files of the battle were to complex for the case. If someone can point me to a muddy map (I could not recreate the mud condition), I can create a test file.)

[HammerGS]

Duplicate and related too #3499