"Bob Noel" wrote in message
...
In article ,
"Steven P. McNicoll" wrote:


And how many AC's are referenced in the FARs?


I don't know. You'll have to count them yourself.


can you find even one?



Certainly.


PART 21-CERTIFICATION PROCEDURES FOR PRODUCTS AND PARTS

§ 21.305 Approval of materials, parts, processes, and appliances.
Whenever a material, part, process, or appliance is required to be approved
under this chapter, it may be approved-

(a) Under a Parts Manufacturer Approval issued under §21.303;

(b) Under a Technical Standard Order issued by the Administrator. Advisory
Circular 20-110 contains a list of Technical Standard Orders that may be
used to obtain approval. Copies of the Advisory Circular may be obtained
from the U.S. Department of Transportation, Publication Section (M-443.1),
Washington, D.C. 20590;

(c) In conjunction with type certification procedures for a product; or

(d) In any other manner approved by the Administrator.

[Amdt. 21-38, 37 FR 10659, May 26, 1972, as amended by Amdt. 21-50, 45 FR
38346, June 9, 1980]