Minimum Altitudes for IFR Operations

[Bascuela]

Scenario:
An airports DP or ODP will take a pilot to an enroute fix. Sometimes there is a minimum altitude upon crossing that fix or even a climbing holding pattern at the fix to continue on course. It was always my understanding that if a pilot was to leave that fix and go off published route, then the pilot would need to be at least at the MORA (OROCA). Sometimes the MORA can be very high because of nearby terrain in the grid.

Question:
Can a pilot leave the published route BELOW the MORA still climbing to cruise altitude?

My take has always been that you need to be at the MORA if operating off route as per 91.177 (a)(1). However, when I continue to read the regulation I’m not sure what paragraph two is talking about. Can I break out my VFR sectional, draw my course and measure 1000’ (or 2000’) above the highest obstacle and then use that as my “MORA”? From an obstacle clearance standpoint it works, but is that legal? Also, 91.177(a)(2) “….If no applicable minimum altitude is prescribed…” When would this apply?
- Thanks

[tgrayson]

Originally Posted by Bascuela

Scenario:Can I break out my VFR sectional, draw my course and measure 1000’ (or 2000’) above the highest obstacle and then use that as my “MORA”? From an obstacle clearance standpoint it works, but is that legal? Also, 91.177(a)(2) “….If no applicable minimum altitude is prescribed…” When would this apply?

The Grid MORA is not a Part 95 or 97 altitude, so it doesn't apply in this situation. Therefore, when not on an instrument approach or airway, the 1,000/2,000 foot rule applies. Sectionals are commonly used for these operations.

However, a cartographer at NACO expressed the opinion that sectionals weren't accurate enough for this operation. They don't have to show man-made obstacles less than 200' ft AGL, and they will sometimes move obstacles for chart clarity. There may be other issues as well.

[Bascuela]

Question answered. Thanks!