[Code of Federal Regulations]

[Title 14, Volume 1]

[Revised as of January 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 14CFR21.99]



[Page 134]

 

                     TITLE 14--AERONAUTICS AND SPACE

 

CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

 

PART 21_CERTIFICATION PROCEDURES FOR PRODUCTS AND PARTS--Table of Contents

 

                 Subpart D_Changes to Type Certificates

 

Sec. 21.99  Required design changes.



    (a) When an Airworthiness Directive is issued under Part 39 the 

holder of the type certificate for the product concerned must--

    (1) If the Administrator finds that design changes are necessary to 

correct the unsafe condition of the product, and upon his request, 

submit appropriate design changes for approval; and

    (2) Upon approval of the design changes, make available the 

descriptive data covering the changes to all operators of products 

previously certif icated under the type certificate.

    (b) In a case where there are no current unsafe conditions, but the 

Administrator or the holder of the type certificate finds through 

service experience that changes in type design will contribute to the 

safety of the product, the holder of the type certificate may submit 

appropriate design changes for approval. Upon approval of the changes, 

the manufacturer shall make information on the design changes available 

to all operators of the same type of product.



[Doc. No. 5085, 29 FR 14567, Oct. 24, 1964, as amended by Amdt. 21-3, 30 

FR 8826, July 24, 1965]