Felix the Rat wrote:
I really wanted to find a happier answer to this, but it looks like it affects all movement types.
pg. 255
"If a rule references speed without specifying a movement type, it refers to whatever movement type you are using."
Pg. 196
"Speed Adjustment: While wearing the armor, your speed is adjusted by this number."
If you combine the two, armor does not specify the movement type so it would apply to whichever type you are using.
Thanks for your effort here Felix. I had found the ruling on pg. 255 but it seemed daft to me that climbing, flying and swimming were subject to armour check penalty AND speed adjustment.