Only official instrument approaches authorised under FAR?

There are instrument approaches that are approved by the FAA that are not
available to the general public. The approach plate notes that approach
only applies to aircraft from Company XYZ. You will not find in in any
approach book. Typically the approach was developed by the private entity
and submitted for approval. Our company had one in Alaska. The approach
still exists, but we no longer fly to that destination.

"Peter" wrote in message
...

FAR 91.175 (a) suggests that it is not permitted to carry out a
descent in IMC except on an official published IAP.

Any views on this?

How would it differ if the entire procedure was done in Class G?


Peter.
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