[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: 14CFR27.351]

[Page 581]
 
                     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.  27.351  Yawing conditions.

    (a) Each rotorcraft must be designed for the loads resulting from 
the maneuvers specified in paragraphs (b) and (c) of this section with--
    (1) Unbalanced aerodynamic moments about the center of gravity which 
the aircraft reacts to in a rational or conservative manner considering 
the principal masses furnishing the reacting inertia forces; and
    (2) Maximum main rotor speed.
    (b) To produce the load required in paragraph (a) of this section, 
in unaccelerated flight with zero yaw, at forward speeds from zero up to 
0.6 VNE--
    (1) Displace the cockpit directional control suddenly to the maximum 
deflection limited by the control stops or by the maximum pilot force 
specified in Sec.  27.397(a);
    (2) Attain a resulting sideslip angle or 90[deg], whichever is less; 
and
    (3) Return the directional control suddenly to neutral.
    (c) To produce the load required in paragraph (a) of this section, 
in unaccelerated flight with zero yaw, at forward speeds from 0.6 
VNE up to VNE or VH, whichever is 
less--
    (1) Displace the cockpit directional control suddenly to the maximum 
deflection limited by the control stops or by the maximum pilot force 
specified in Sec.  27.397(a);
    (2) Attain a resulting sideslip angle or 15[deg], whichever is less, 
at the lesser speed of VNE or VH;
    (3) Vary the sideslip angles of paragraphs (b)(2) and (c)(2) of this 
section directly with speed; and
    (4) Return the directional control suddenly to neutral.

[Amdt. 27-26, 55 FR 7999, Mar. 6, 1990, as amended by Amdt. 27-34, 62 FR 
46173, Aug. 29, 1997]