Originally Posted by
Flying Lawyer
There's no reason why there can't be a helipad on top of a mesa - you just have to think of a reason for it to be there.
How high does the mesa have to be?
A couple of ideas to start -
- The LA Fire Department has (I assume it's still there) a helipad on top of a steep canyon in the Hollywood hills with a helicopter crew positioned there overlooking LA in the afternoons.
(Great for practising pinnacle landings in the mornings. 
)
- At least one of the LA radio stations has a helipad next to its antenna high up in the hills.
Helicopters are frequently used for inspections in remote areas. If you look at the photographs in the 'Rotorheads Around the World' collection you'll see some shots of helicopters on pads high in the mountains.
Link here
http://www.pprune.org/forums/showthread.php?t=76347
Some superb shots of helicopters on mountain pads in Canada were posted yesterday.
There are lots, but post #2762 is a good place to start.
You'll find plenty of scope there for your imagination and someone falling to their death.
I made a very lengthy reply to your excellent post, Flying Lawyer. But it was SOOOO long it got swept away into the mod's queue of posts needing to be reviewed and edited down before it can be posted. So please don't think I'm ignoring you (I feel bad if I don't respond to someone's post, especially one that obviously took some time). My response will come.