In article ,
"O. Sami Saydjari" wrote:


There are rules on how many different sectors you can have, how big they
must be, etc. I don't remember the details, but you should be able to
find them in TERPS.


I am sorry to demonstrate my ignorance, but what are the "TERPS" and
where might I find them? I did notice that the AIM says that sectors
have to be no smaller than 90 degrees, so there can be no more than
four. It does not say the criteria for deciding when and whether to
subdivide the MSA circle.

-Sami


TERPS is "United States for Terminal Instrument Procedures". You can
find a copy here....

http://av-info.faa.gov/terps/directives%20page.htm

It describes in gruesome detail what goes into constructing IFR
procedures such as instrument approaches.