[chrisdahut1]

taseal,

Kudos on trying to further your instrument knowledge, but what you're doing might be a tad counter productive. At your level, you only need to be concerned about Part 91 regulations. Don't start studying the additional (and often confusing) layer of regulations that is part 121 until you are at the very least finished with the IR. All the questions you asked have answers that at this point in time are of no concern to you, and by trying to learn and memorize the answers you may start getting a little overwhelmed!

Here's some answers you might find useful:

"whats with the 6-6-6, 5-6-6 and what is a 10-9 airport info page? something out of AIM? lol"

-6-6-6 (or any combination of numbers used in that context) refers to RVR value. Runways approved for low visibility takeoffs will typically have 3 RVR systems per runway- referred to as touchdown, mid and rollout RVR. Each number corresponds to the minimum visibility each RVR must report (in hundreds of feet) in order to be legal to depart under 121. For example, if someone says "the RVRs are 5-6-3" they mean "The Touchdown RVR is reporting 500 ft, the Mid RVR is reporting 600 ft and the roll out RVR is reporting 300 feet". You'll hear the numbers "6-6-6" get quoted often as this is typically the lowest value that any airline or runway will be approved for.

10-9 refers to the number on the top of Jeppesen airport diagrams (that also contain minimum take off visibility data for each runway).

"I'm also a bit confused about the diff between RVV and RVR. what is the diff?"

-RVV stands for "Runway Visibility Value" and RVR stands for "Runway Visual Range". RVV is RVR's less precise cousin...it'll give you a visibility value for the runway much like the tower or a METAR will give prevailing visibility in SM rather then feet (eg - 1/4SM visibility).


"lets say the RVR is 1800 and vis 1/4. the mins for that app is higher (3600 and 3/4 lets say) as a part 91 pilot, can I still shoot that app? (afaik I can still shoot the app as a part 91 pilot, because both are not reported distances from the air. However if tower says that the visual range from the tower is 2000, I can no longer shoot that app correct?)"

-You can legally shoot the approach under part 91 even if the visibility is zero (however, expect to go missed). Part 121 requires you to have minimum prescribed visibility for the approach prior to crossing the FAF. Under Part 91, weather only controls whether or not you can descend below minimums, and even then it's based on inflight visibility (what you see) and not what tower sees.


"1 more.... grid MORA. what area does it cover? like a 50 mile radius?"

-look at an enroute chart....you'll see square "grids" made up of intersecting lines of latitude and longitude. The MORA is valid within the entire grid (notice how there's only one MORA number for each grid?)

As for MOCA and MCA...you are 100% correct.

Hope this helps. Good luck on your instrument ride! Keep studying and asking questions, but don't get distracted by the 121 stuff....it can be a bitch to learn even after you have a solid understanding of part 91 regs!