[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: 14CFR27.395]

[Page 582]
 
                     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.  27.395  Control system.

    (a) The part of each control system from the pilot's controls to the 
control stops must be designed to withstand pilot forces of not less 
than--
    (1) The forces specified in Sec.  27.397; or
    (2) If the system prevents the pilot from applying the limit pilot 
forces to the system, the maximum forces that the system allows the 
pilot to apply, but not less than 0.60 times the forces specified in 
Sec.  27.397.
    (b) Each primary control system, including its supporting structure, 
must be designed as follows:
    (1) The system must withstand loads resulting from the limit pilot 
forces prescribed in Sec.  27.397.
    (2) Notwithstanding paragraph (b)(3) of this section, when power-
operated actuator controls or power boost controls are used, the system 
must also withstand the loads resulting from the force output of each 
normally energized power device, including any single power boost or 
actuator system failure.
    (3) If the system design or the normal operating loads are such that 
a part of the system cannot react to the limit pilot forces prescribed 
in Sec.  27.397, that part of the system must be designed to withstand 
the maximum loads that can be obtained in normal operation. The minimum 
design loads must, in any case, provide a rugged system for service use, 
including consideration of fatigue, jamming, ground gusts, control 
inertia, and friction loads. In the absence of rational analysis, the 
design loads resulting from 0.60 of the specified limit pilot forces are 
acceptable minimum design loads.
    (4) If operational loads may be exceeded through jamming, ground 
gusts, control inertia, or friction, the system must withstand the limit 
pilot forces specified in Sec.  27.397, without yielding.

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-26, 
55 FR 7999, Mar. 6, 1990]