This document supersedes DO-181D published in 2008. It
provides standards for Mode S airborne equipment (Mode S)
implies a combined ATCRBS/Mode S capability). Incorporated
within these standards are system characteristics that will
be useful to users of the system as well as designers,
manufacturers and installers. The document considers an
equipment configuration consisting of: transponder, control
panel, antenna and interconnecting cables. Level 1 through
Level 5 transponders are addressed, test procedures are
provided as well as information for optional features. It
reflects issues identified and discussed by the ICAO
Aeronautical Surveillance Panel Technical Subgroup and
reported by Civil Aviation Authorities since the publication
of DO-181D in October 2008. The document is a coordinated
effort with EUROCAE WG-49 and includes changes resulting from
DO-260B - ADS-B MOPS, published in December 2009. Appendix E
details the Changes from DO-181D to DO-181E.
