HCAA SIAN 03-2025- ADS-B Out, Mode S and Mode C Transponder Systems: Ground Testing

Is addressed to:

Owners and operators of aircraft that have a secondary surveillance radar (SSR) mode S transponder, automatic dependent surveillance broadcast out (ADS-B out) transmitter, or SSR mode C transponder systems installed.

 Briefing:

Recipients must ensure that this notice is communicated to all members of their staff who need to take appropriate action or who may be interested in the contents of the notice.

DESCRIPTION

This SIAN is issued following EASA SIB 2011-15R3 issued on 8 May 2025.

The above SIB revises EASA SIB 2011-15R2 dated 19 July 2013

Mode S transponder systems, ADS-B Out transmitter systems and Mode C transponder systems are known to be installed on, but not limited to, aircraft certified under EASA CS 22, 23, 25, 27, 29, 31HB, VLA, VLR or LSA; or equivalent Federal Aviation Requirements or Joint Aviation Requirements.

Accurate and reliable surveillance information (including altitude reporting) and aircraft and/or flight data, transmitted by ADS-B Out, Mode S and Mode C transponder systems when the aircraft is in flight and on the ground, are crucial for the safe and smooth operation of today’s air traffic management environment.

The EASA SIB includes 3 appendices with instructions on how to check and calibrate the systems installed in the aircraft.