This document supersedes DO-181C published in 2001. 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 the latest amendment to ICAO Annex 10. The document
is a coordinated effort with EUROCAE WG-49.
