flyingcheesehead
Touchdown! Greaser!
Well, there's already two threads on this, but I've gotta start a third - I have some questions about the procedures involved.
Looking at the GEYSER FOUR departure, you need a fairly crazy climb gradient - 450'/nm all the way to 14,000 feet, so very few normally aspirated birds will be able to make it.
But... What is the purpose of that requirement? Following the procedure, it's a total of 17nm to NALSI. 450'/nm * 17nm + 6451 ft (field elev) = 14,101 so you'd be climbing like mad all the way to NALSI...
... only to have the MEA drop to 12000 and the MOCA drop to 10,800 if you're eastbound.
Westbound, I can see the requirement, since there's a 14,100 crossing restriction at QUIRT anyway (but an extra 3 miles to get there too...) But if you're eastbound - Why the need to climb so high? There's no apparent reason.
On the TETON THREE, the gradient makes more sense, but still seems high. The highest terrain along that route is at 9980, 21nm from KJAC. It seems that the procedure should be designed to have you at 12,000 by there, but that's a gradient of only 265'/nm. Also, it's unclear why you need to climb to 14,000 at all on this departure, as 12,000 should give you the necessary 2000 feet of obstacle clearance, and even the OROCA after KICNE is only 13,200. Finally, there are airways departing IDA with MEA's as low as 7,000'.
Any ideas?
Looking at the GEYSER FOUR departure, you need a fairly crazy climb gradient - 450'/nm all the way to 14,000 feet, so very few normally aspirated birds will be able to make it.
But... What is the purpose of that requirement? Following the procedure, it's a total of 17nm to NALSI. 450'/nm * 17nm + 6451 ft (field elev) = 14,101 so you'd be climbing like mad all the way to NALSI...
... only to have the MEA drop to 12000 and the MOCA drop to 10,800 if you're eastbound.
Westbound, I can see the requirement, since there's a 14,100 crossing restriction at QUIRT anyway (but an extra 3 miles to get there too...) But if you're eastbound - Why the need to climb so high? There's no apparent reason.
On the TETON THREE, the gradient makes more sense, but still seems high. The highest terrain along that route is at 9980, 21nm from KJAC. It seems that the procedure should be designed to have you at 12,000 by there, but that's a gradient of only 265'/nm. Also, it's unclear why you need to climb to 14,000 at all on this departure, as 12,000 should give you the necessary 2000 feet of obstacle clearance, and even the OROCA after KICNE is only 13,200. Finally, there are airways departing IDA with MEA's as low as 7,000'.
Any ideas?
