captain dad
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- Mar 30, 2006
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As a pilot, 135 alternates need to be within the specified distance, engine out, calm air, etc... and 400' and 1 mile or 200' and 1/2 to the higher of each mins using the one nav aid / two nav aid rule.Sorry for a change of topic. I'm trying to get familiar with the Part 135 side of things:
What is the Part 135 weather minimum for an airport to qualify as an alternate? (E.g. Part 91 is 600 and 2 (ILS) and 800-2 (Non-Pre) Is it based on the 1 nav-aid/ 2nav-aid rule?
If the ceiling (but not visibility) is reported below min outside the FAF while the flight is under 135, can the app continue? What about under Part 91K? (e.g. OK under 121)
Thanks
So if you have a LOC with 600' and 1/2 and a VOR with 450' and 1, and you use the two nav aid rule, your mins would be 800' and 1 1/2 (higher of the two mins 600' plus 200' and 1 plus the 1/2). Suitability of runway for wind direction also comes in to play and should always be on your mind no matter if it is required or not.
Visibility is the controling factor in your example.
91 and 91k visibility can be below mins prior to the FAF and you can still shoot the approach. (go take a look situation)
135 you must have required visibility prior to the FAF to start the approach. If it drops below after the FAF you can continue the approach.
If RVR is reported, it is always controling. It would also be hard to plead a case that you had inflight visibility when RVR is reported below mins. Good to keep in mind if you ever think you can "sneak it in".
Op Specs vary from the regs. When in doubt FOM / OP SPECS first then and FAR / AIM.
Fly Safe
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