[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: 14CFR27.307]

[Page 580]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 27_AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT--Table 
of Contents
 
                     Subpart C_Strength Requirements
 
Sec.  27.307  Proof of structure.

    (a) Compliance with the strength and deformation requirements of 
this subpart must be shown for each critical loading condition 
accounting for the environment to which the structure will be exposed in 
operation. Structural analysis (static or fatigue) may be used only if 
the structure conforms to those structures for which experience has 
shown this method to be reliable. In other cases, substantiating load 
tests must be made.
    (b) Proof of compliance with the strength requirements of this 
subpart must include--
    (1) Dynamic and endurance tests of rotors, rotor drives, and rotor 
controls;
    (2) Limit load tests of the control system, including control 
surfaces;
    (3) Operation tests of the control system;
    (4) Flight stress measurement tests;
    (5) Landing gear drop tests; and
    (6) Any additional test required for new or unusual design features.

(Secs. 604, 605, 72 Stat. 778, 49 U.S.C. 1424, 1425)

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-3, 33 
FR 14105, Sept. 18, 1968; Amdt. 27-26, 55 FR 7999, Mar. 6, 1990]