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AC 27-1B

Change 1-9
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Advisory circular · Certification of Normal Category Rotorcraft

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Approved
June 23, 2023
Last reviewed
June 29, 2023
Cancels
AC27-1B Change 8
Family
AC 27-1 · 10 versions
Revision
B, Change 9
14 CFR parts
27
Cited by
1 AD
14 CFR sections
§ 27.87§ 27.903§ 27.1305§ 27.1309§ 27.1329§ 27.1335§ 27.1353§ 27.1543§ 27.1545§ 27.1549§ 27.1555§ 27.1587

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed October 23, 2026.

Full textOCRVersions and citations
Show pages 1183–1194
Page 1195OCROpen in PDF

2/4/2016 FIGURE AC 27.APХ B-1 ROTORCRAFT DYNAMIC STABILITY 35 30

ACCEPTABLE

REQUIREMENTS FOR IFR

UNACCEPTABLE Page Apdx B - 21 -0.2 0.05 Ø.15 AC 27-1B, Chg 7

DAMPING RATIO

Page 1196OCROpen in PDF

AC 27 APPENDIX B (AMENDMENT 27-51) AIRWORTHINESS GUIDANCE FOR ROTORCRAFT INSTRUMENT FLIGHT.

a. Explanation.

(3) Amendment 27-51 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 nonpneumatic systems.

Page Apdx B - 22