[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR31.43]

[Page 765-766]
 
                     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.  31.43  Fitting factor.

    (a) A fitting factor of at least 1.15 must be used in the analysis 
of each fitting the strength of which is not proven by limit and 
ultimate load tests

[[Page 766]]

in which the actual stress conditions are simulated in the fitting and 
surrounding structure. This factor applies to all parts of the fitting, 
the means of attachment, and the bearing on the members joined.
    (b) Each part with an integral fitting must be treated as a fitting 
up to the point where the section properties become typical of the 
member.
    (c) The fitting factor need not be used if the joint design is made 
in accordance with approved practices and is based on comprehensive test 
data.