---
title: "AWO.B.CATIII.128 CS AWO.B.CATIII.128 Documentation required — CS-AWO · Avioverse"
description: "Documentation providing the following information is required for certification:"
url: "https://avioverse.aero/regulations/easa/cs-awo/subpart-b/awo-b-catiii-128"
---

# AWO.B.CATIII.128 CS AWO.B.CATIII.128 Documentation required

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

Official sources: [EASA Easy Access Rules (opens in a new tab)](https://www.easa.europa.eu/en/document-library/easy-access-rules/easy-access-rules-all-weather-operations-cs-awo)

IR Implementing rule

## AWO.B.CATIII.128 CS AWO.B.CATIII.128 Documentation required

Documentation providing the following information is required for certification:

(a) A specification of the aeroplane and the airborne equipment.

(b) Evidence that the equipment and its installation comply with the applicable standards.

(c) A failure analysis and an assessment of system safety (see AMC 25.1309).

(d) A performance analysis demonstrating compliance with the performance criteria of CS AWO.B.CATIII.115, CS AWO.B.CATIII.116 and CS AWO.B.CATIII.117 (see CS AWO.A.ALS.106(b)).

(e) Flight test results including validation of any simulation.

(f) Limitations on the use of the system and crew procedures to be incorporated in the AFM;

(g) Evidence that the crew workload complies with CS 25.1523.

(h) Inspection and maintenance procedures shown to be necessary by the system safety assessment (see CS 25.1529).

\[Issue: CS-AWO/2]

IR · AWO.B.CATIII.128 — 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](https://avioverse.aero/regulations/easa/cs-awo/subpart-b)

Consolidated from the EASA Easy Access Rules (revision 14 Aug 2026, extracted 2 Nov 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.