[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR31.12]

[Page 751]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 31--AIRWORTHINESS STANDARDS: MANNED FREE BALLOONS--Table of Contents
 
                     Subpart B--Flight Requirements
 
Sec. 31.12  Proof of compliance.


    (a) Each requirement of this subpart must be met at each weight 
within the range of loading conditions for which certification is 
requested. This must be shown by--
    (1) Tests upon a balloon of the type for which certification is 
requested or by calculations based on, and equal in accuracy to, the 
results of testing; and
    (2) Systematic investigation of each weight if compliance cannot be 
reasonably inferred from the weights investigated.
    (b) Except as provided in Sec. 31.17(b), allowable weight tolerances 
during flight testing are +5 percent and -10 percent.

[Amdt. 31-4, 45 FR 60179, Sept. 11, 1980]