---
title: "CAT.IDE.A.355 Management of aeronautical databases — Part-CAT · Avioverse"
description: "Aeronautical databases used on certified aircraft system applications shall meet data quality requirements that are adequate for the intended use of the…"
url: "https://avioverse.aero/regulations/easa/air-ops/part-cat/subpart-d/cat-ide-a-355"
---

# CAT.IDE.A.355 Management of aeronautical databases

ANNEX IV (Part-CAT) · Regulation (EU) No 965/2012 · EAR revision 27 Mar 2026

IR Implementing rule

## CAT.IDE.A.355 Management of aeronautical databases

(a) Aeronautical databases used on certified [aircraft](https://avioverse.aero/glossary/easa/aircraft) system applications shall meet data quality requirements that are adequate for the intended use of the data.

(b) The operator shall ensure the timely distribution and insertion of current and unaltered aeronautical databases to all aircraft that require them.

(c) Notwithstanding any other occurrence reporting requirements as defined in Regulation (EU) No 376/2014, the operator shall report to the database provider instances of erroneous, inconsistent or missing data that might be reasonably expected to constitute a hazard to flight.

In such cases, the operator shall inform flight crew and other personnel concerned, and shall ensure that the affected data is not used.

IR · CAT.IDE.A.355 — Regulation (EU) No 965/2012 · Regulation (EU) 2016/1199 · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

AMC Acceptable means of compliance

## AMC1 CAT.IDE.A.355 Management of aeronautical databases

AERONAUTICAL DATABASES

When the operator of an [aircraft](https://avioverse.aero/glossary/easa/aircraft) uses an aeronautical database that supports an airborne navigation application as a primary means of navigation used to meet the airspace usage requirements, the database provider should be a Type 2 DAT provider certified in accordance with Regulation (EU) 2017/373 or equivalent.

AMC · AMC1 CAT.IDE.A.355 — Regulation (EU) No 965/2012 · ED Decision 2017/003/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

GM Guidance material

## GM1 CAT.IDE.A.355 Management of aeronautical databases

AERONAUTICAL DATABASE APPLICATION

(a) Applications using aeronautical databases for which Type 2 DAT providers should be certified in accordance with Regulation (EU) 2017/373 may be found in GM1 DAT.OR.100.

(b) The certification of a Type 2 DAT provider in accordance with Regulation (EU) 2017/373 ensures data integrity and compatibility with the certified [aircraft](https://avioverse.aero/glossary/easa/aircraft) application/equipment.

GM · GM1 CAT.IDE.A.355 — Regulation (EU) No 965/2012 · ED Decision 2017/003/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

GM Guidance material

## GM2 CAT.IDE.A.355 Management of aeronautical databases

TIMELY DISTRIBUTION

The operator should distribute current and unaltered aeronautical databases to all [aircraft](https://avioverse.aero/glossary/easa/aircraft) requiring them in accordance with the validity period of the databases or in accordance with a procedure established in the operations manual if no validity period is defined.

GM · GM2 CAT.IDE.A.355 — Regulation (EU) No 965/2012 · ED Decision 2017/003/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

GM Guidance material

## GM3 CAT.IDE.A.355 Management of aeronautical databases

STANDARDS FOR AERONAUTICAL DATABASES AND DAT PROVIDERS

(a) A ‘Type 2 DAT provider’ is an organisation as defined in Article 2(5)(b) of Regulation (EU) 2017/373.

(b) Equivalent to a certified ‘Type 2 DAT provider’ is defined in any Aviation Safety Agreement between the European Union and a third country, including any Technical Implementation Procedures, or any Working Arrangements between EASA and the competent authority of a third country.

GM · GM3 CAT.IDE.A.355 — Regulation (EU) No 965/2012 · ED Decision 2017/003/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

[All rules in SUBPART D: INSTRUMENTS, DATA, EQUIPMENT](https://avioverse.aero/regulations/easa/air-ops/part-cat/subpart-d)

Consolidated from the EASA Easy Access Rules (revision 27 Mar 2026, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.