[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR31.33]

[Page 729]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 31--AIRWORTHINESS STANDARDS: MANNED FREE BALLOONS--Table of Contents
 
                     Subpart D--Design Construction
 
Sec. 31.33  Materials.

    (a) The suitability and durability of all materials must be 
established on the basis of experience or tests. Materials must conform 
to approved specifications that will ensure that they have the strength 
and other properties assumed in the design data.
    (b) Material strength properties must be based on enough tests of 
material conforming to specifications so as to establish design values 
on a statistical basis.