This has been a topic much on my mind lately, as I hope to be usfs/oas carded by next spring, and I'll need 200 hours of "mountain time".
The problem... no one can tell me the definition of mountain time.
People seem in agreement that here in the states, the forest service used to define mountain time as "above 5,000' density altitude" and some other references to steep terrain and high winds etc. However, I've been told by a reliable source who I've never know to be wrong, that the current contracts require 7,000' pressure altitude to count as mountain time.
On the other hand, I've seen people get carded without this time above 7,000' PA. and I've also heard that the usfs has referenced the AIM definition referenced above by Nick, which is a far cry from the restrictive definition above.
Anyone here know any more about what the USFS is defining mountain time as?