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Originally Posted by taseal  Chrisdahut1, I was told by my inst that since the tower is in the 'air' it counts as inflight visibitlity. thats why if they say the visibility from tower is xxx, thats it... altough I looked at inst procedures book, and it says I can shoot the app no matter what. doesn't say anything about tower, so I guess what my inst said was not valid. |
I disagree with him, you are the one that needs the required flight visibility from your position and it is not necessary the same as what tower has. If there's a fog bank right at the end of the runway, tower may be able to see the runway and report 10+ but if you're in the fog during the approach your flight visibility will be 0 or at least much less than 1/2 SM - I've had that happen to me.
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Originally Posted by taseal Germb747, you say when I have app lights in sight, I can go 100feet below mins. I thougt when you see the app lights, you can go 100agl. not 100ft below mins? (if MDA is 580, I could go 480 you mean? I was always told to go 100 AGL) |
91.175.c.(3).(i) The approach light system, except that the pilot may not descend below 100 feet above the touchdown zone elevation using the approach lights as a reference unless the red terminating bars or the red side row bars are also distinctly visible and identifiable.
It's 100 ft above the TDZE. While with the typical minimum for an ILS being 200 ft, that's 100 ft below DH, it's not correct for approaches with different MDA/DH. I'm not sure how useful that rule is at all for non-precision approaches. If you're say 500 ft AGL and all you can see are the approach lights, it would seem to me that you're way too close to the runway, way too hight to make a normal landing, or if you're far enough than the visibility is good enough for you to see the runway before starting your descend. Someone with more experience might what to share it.