91.177 Minimum altitudes for IFR

[Riddle momma]

You guys and girls are great! It's like having free tutors )

Now, I may be reading too much into this one too. I tend to do that.

However, if noth a MEA and a MOCA are prescribed for a particular route or route segment, a person may operate an aircraft bleow the MEA down to, but not below, the MOCA, when within 22 nautical miles of the VOR concerned..."

Are MOCAs only to be used within 22nm of the VOR? If so, does that imply the terrain clearance is only within the 22nm?

I was under the impression the altitudes could be used along the entire airway, but only nav signal could be guaranteed within 22nm. In this case though, there must be a restriction as to navigation equipment that must be on board (RNAV/GPS), or not?

Wow, this brings up another question: How do you navigate MEA gaps? Dead reckoning like the ol days?!?!? ARE YOU KIDDING ME?!?!

This should be good for now

 

[avbug]

Are you afraid of getting lost during a signal gap? Let's hope not. Are you kidding me???

MOCA provides a minimum terrain separation on the airway, but does not assure signal reception except within 22 nm of the navaid used to define that airway segment.

 

[Riddle momma]

No silly, I'm not affraid of getting lost.

I am asking in case someone asks me and I can give the correct answer. DR is what I would do. But what about the rest?

 

[mainah]

GPS, no headaches this way

 

[avbug]

MEA gap is simply an area where primary navaid signal strength is absent, or degraded, or simply not assured. Typically found in mountainous areas.

You may not have primary signal coverage. However, you may have radar coverage, or other means to navigate.

Must you use dead reckoning? No. You may use other navaids, a series of position fixes, radar, GPS, RNAV, NDB, dme/dme, and any other type of combination of navigation used to reliably fix your position. You may use dead reckoning, however.

Hold your heading until you pick up the signal on the other side. Problem solved.

Dead reckoning like the "old" days? No. Dead reckoning like t-o-d-a-y.