AC 29-2C, Chg 7 2/4/2016
(i) Static Longitudinal Stability: The requirements of Appendix B to part 27, paragraph IV are not applicable.
(ii) Static Lateral-Directional Stability: The requirements of Appendix B to part 27, paragraph V are not applicable.
(iii) Dynamic Stability: In lieu of the requirements of Appendix B to part 29, paragraph VI, the following apply:
(A) Any oscillation must be damped and any aperiodic response must not double in amplitude in less than 10 seconds. This requirement must also be met with degraded upper mode(s) of the AFCS.
(B) After any upset, such as a wind gust, the AFCS must return the aircraft to the last commanded position within 10 seconds or less.
(10) With any of the upper mode(s) of the AFCS engaged, the pilot must be able to manually recover the aircraft and transition to the normal (Appendix B to part 29) IFR flight profile envelope without exceptional skill, alertness, or strength.
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40 35 30 ~ I \, 0 w 25 (j) -0 0 f5 20
0..
15 I L 10 I
UNACCEPTABLE 5 -0.3 -0.2 -0.1 I' ' 0
DAMPING RATIO
ACCEPTABLE
0.05 0.1 0.15 2/4/2016 AC 29-2C, Chg 7 FIGURE AC 29 APX B-1 ROTORCRAFT DYNAMIC STABILITY
REQUIREMENTS FOR IFR Page Apdx B - 27
AC 29 APPENDIX B (AMENDMENT 29-59) AIRWORTHINESS GUIDANCE FOR ROTORCRAFT INSTRUMENT FLIGHT.
a. Explanation.
(3) Amendment 29-59 revised section VIII (b)(5)(i), which requires isolating the pilot instrument system from any other operating systems, to only apply to pneumatic systems. This change allows other types of pilot instrument systems to be connected to other systems on the rotorcraft and allows the use of modern technology to monitor and display highly integrated information. This guidance remains unchanged except paragraphs (b)(9)(v) and (b)(9)(vi) of this AC section do not apply to non-pneumatic systems.
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