ED Decision 2022/018/R
This Appendix lists the EASA modifications to EUROCAE ED‑221A for Traffic Alert and Collision Avoidance System II (TCAS II) Hybrid Surveillance, dated December 2015.
To facilitate the monitoring by maintenance personnel of the hybrid surveillance functionality, add the following requirement as the fifth paragraph (including the Note) in Section 2.2.10, Monitoring Requirements:
‘TCAS II units shall provide a means for presenting logged hybrid surveillance faults to maintenance personnel to enable on-wing monitoring of hybrid surveillance functionality at periodic intervals.
Note: This requirement enables the implementation of a scheduled maintenance task to ensure that hybrid surveillance is functional on aircraft without a centralised warning system and/or an on-board maintenance computer.’
[Amdt ETSO/11]
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