FAA AC 25-28 : 2014

1 Purpose
2 Applicability
3 Cancellation
4 Background
5 Definition of Terms
6 Icing Envelopes
7 Certification Plan
8 Analysis
9 Simulated Ice Shapes and Roughness
10 Critical Ice Shapes
11 Compliance Tests (Flight/Simulation)
12 Certification with section 25.1420
13 Pneumatic Deicer Boots
14 Emergency and Abnormal Operating Conditions
15 Ice and Icing Conditions Detection Systems
16 Performing Intended Functions in Icing
17 Ice Inspection Light(s)
18 Caution Information
19 Airplane Flight Manual
20 Guidance for Amended Type Certificates and
   Supplemental Type Certificates
21 Instructions for Continued Airworthiness
Appendix A - Related Regulations and Documents
Appendix B - History of Icing Certification Rules
Appendix C - Example of Certification to 25.1420
             (a)(1) Using Visual Cues
Appendix D - Guidance for Amended Type Certificates
             and Supplemental Type Certificates
Appendix E - Capabilities of Engineering Tools for
             Compliance with Part 25, Appendix O
             Requirements
Appendix F - Acronyms

Specifies an acceptable means for showing compliance with the supercooled large drop condition requirements of section 25.773, Pilot compartment view, section 25.1323, Airspeed indicating system, section 25.1324, Angle of attack system, and section 25.1325, Static pressure systems, as well as the requirements of section 25.1419, Ice protection, and section 25.1420, Supercooled large drop icing conditions, of 14 CFR part 25. Part 25 contains the certification requirements for transport category airplanes.