AWO.B.CATIII.121 CS AWO.B.CATIII.121 General

All Weather Operations (CS-AWO) · CS-AWO · EAR revision 14 Aug 2026

IRImplementing rule

AWO.B.CATIII.121CS AWO.B.CATIII.121 General

(See CS 25.1309 and its AMC, and AMC1 AWO.B.CATIII.121 and AMC2 AWO.B.CATIII.121)

- (a) The effects of failures of the flight guidance system including the navigation means (facilities external to the aircraft) shall be considered in accordance with CS 25.1309 and CS 25.1329. - (b) The radio altimeter (or other device capable of providing equivalent performance and integrity level), and excess-deviation alerts shall comply with CS AWO.B.CATII.120 and CS AWO.B.CATII.121 respectively.

[Issue: CS-AWO/2]

IR · AWO.B.CATIII.121 — CS-AWO · ED Decision 2022/007/R · CS-AWO Easy Access Rules · EAR revision 14 Aug 2026

AMCAcceptable means of compliance

AMC2 AWO.B.CATIII.121 Flight crew and maintenance checks

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When exposure times relevant to failure probability calculations are dependent on flight crew and maintenance checks (i.e. preflight, first flight of the day, pre-land, etc.) and/or inspection intervals for dormant (latent) failures, these tasks, time intervals and the recommended component monitoring programme should be specified in the AFM or maintenance manual as appropriate.

[Issue: CS-AWO/2]

FAILURE CONDITIONS

AMC — CS-AWO · ED Decision 2022/007/R · CS-AWO Easy Access Rules · EAR revision 14 Aug 2026

AMCAcceptable means of compliance

AMC1 AWO.B.CATIII.121 Flight demonstrations of failure conditions

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AMC — CS-AWO · ED Decision 2022/007/R · CS-AWO Easy Access Rules · EAR revision 14 Aug 2026

All rules in SUBPART B -APPROACH AND LANDING SECTION 4 -AIRWORTHINESS CERTIFICATION OF AEROPLANES FOR OPERATIONS WITH DECISION HEIGHTS (DHs) BELOW 30 M (100 FT) OR NO DECISION HEIGHT (DH) -CATEGORY III (CAT III) OPERATIONS

Consolidated from the EASA Easy Access Rules (revision 14 Aug 2026, extracted 17 Aug 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.

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