bafanguy
Well-known member
- Joined
- Apr 4, 2004
- Posts
- 2,530
PC12,
It might be hard to find a copy, but reading amendment 121-166 ( circa Dec/'80) will give a detailed, but good overview of this viz thing. When this current FAR was revised in 1980, the amendment was a part of the FAR 121, change #41.
Referring to the use of the term "visibility" in the FAR as it relates to continuing descent below DA/MDA, the amendment says, "...(the intents in the new FAR) retain the concept of pilot determination of the specified visibility and clarify the frequently misunderstood point that the visibility referred to is FLIGHT VISIBILITY." I don't believe RVR is considered "flight visibility".
I am prepared to stand corrected, but I was taught that if you get to DA, and have the required visual references "distinctly visible and indentifiable to the pilot", you have the required "flight visibilty".
Why would FAR/ops specs allow a look-see in certain circumstances when ground viz is reported below published mins ( after you're inside FAF, for example ) except to acknowledge the fact that "flight" viz may be better/different than "ground" viz ( RVR, prevailing viz, etc. ) in many cases, allowing a safe continuation to landing ?
Someone better educated than I will jump in with a bet-the-rent-money answer.
I see that ASquared's letter from the Feds says it all.
It might be hard to find a copy, but reading amendment 121-166 ( circa Dec/'80) will give a detailed, but good overview of this viz thing. When this current FAR was revised in 1980, the amendment was a part of the FAR 121, change #41.
Referring to the use of the term "visibility" in the FAR as it relates to continuing descent below DA/MDA, the amendment says, "...(the intents in the new FAR) retain the concept of pilot determination of the specified visibility and clarify the frequently misunderstood point that the visibility referred to is FLIGHT VISIBILITY." I don't believe RVR is considered "flight visibility".
I am prepared to stand corrected, but I was taught that if you get to DA, and have the required visual references "distinctly visible and indentifiable to the pilot", you have the required "flight visibilty".
Why would FAR/ops specs allow a look-see in certain circumstances when ground viz is reported below published mins ( after you're inside FAF, for example ) except to acknowledge the fact that "flight" viz may be better/different than "ground" viz ( RVR, prevailing viz, etc. ) in many cases, allowing a safe continuation to landing ?
Someone better educated than I will jump in with a bet-the-rent-money answer.
I see that ASquared's letter from the Feds says it all.
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