CLEARANCE LIMIT BACK STORY

摘要

Digging beydnd the main article, let's look at the complex and confusing §91.185(c)(3)(i). First, it made some sense before widespread radar coverage, with separation based on pilot position reports. Clearance limits short of the airport were more common to maintain spacing. The illogic of flying over the airport is that many airports lack navaids on the airport, making the use of clumsy VOR cross-radials necessary back in the day. No airport serves as a fix from which an approach begins because airports in IFR cannot be fixes. Subparagraph (c)(3)(i) is essentially useless because the clearance limit airport cannot be a fix.