In the context of ICAO Doc 9640, what does 'one-step de-icing/anti-icing' involve?

One-step de-icing/anti-icing uses heated anti-icing fluid to de-ice the aircraft, and the fluid remains on the surfaces to which it is applied to provide anti-icing capability.

What are the two distinct steps in a 'two-step de-icing/anti-icing' procedure?

The two-step de-icing/anti-icing procedure contains two distinct steps: the first step is de-icing, followed by the second step, anti-icing, as a separate fluid application.

What is the source document for the definitions of 'anti-icing', 'de-icing', and 'de-icing/anti-icing' provided in GM1 Article 3(7)&(8)?

ICAO Doc 9640 provides the definitions for these terms.

GM1 Article 3(7)&(8) Definitions

Q: What is the definition of 'anti-icing' according to ICAO Doc 9640 as referenced in GM1 Article 3(7)&(8)?

Anti-icing is a precautionary procedure by which clean aircraft surfaces are protected against the formation of ice and frost and the accumulation of snow and slush for a limited period.

Q: How does ICAO Doc 9640 define 'de-icing'?

De-icing is the process that removes ice, snow, slush or frost from aircraft surfaces.

Q: What is the difference between 'de-icing' and 'de-icing/anti-icing' as per ICAO Doc 9640 definitions?

De-icing is the process that removes ice, snow, slush or frost from aircraft surfaces, while de-icing/anti-icing is a procedure combining both the de-icing process and the anti-icing process, which can be performed in one or two steps.

Q: According to the referenced ICAO Doc 9640 definitions, what is the purpose of anti-icing fluid in a one-step de-icing/anti-icing procedure?

The heated anti-icing fluid is used to de-ice the aircraft and remains on the surfaces to which it is applied to provide anti-icing capability.

Q: Does the two-step de-icing/anti-icing procedure allow the de-icing and anti-icing steps to be performed simultaneously?

No, the two-step procedure contains two distinct steps: the first step, de-icing, is followed by the second step, anti-icing, as a separate fluid application.

Q: In the one-step de-icing/anti-icing procedure, what happens to the heated anti-icing fluid after it is applied?

The heated anti-icing fluid remains on the surfaces to which it is applied to provide anti-icing capability.

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GM1 Article 3(7)&(8) Definitions

ED Decision 2025/007/R

AIRCRAFT GROUND DE‑ICING AND ANTI ICING

ICAO Doc 9640 provides the following definitions for the terms ‘anti‑icing’, ‘de‑icing’ and ‘de‑icing/anti‑icing’.

(a) ‘Anti‑icing’ is a precautionary procedure by which clean aircraft surfaces are protected against the formation of ice and frost and the accumulation of snow and slush for a limited period.

(b) ‘De‑icing’ is the process that removes ice, snow, slush or frost from aircraft surfaces.

(c) ‘De‑icing/anti‑icing’ is a procedure combining both the de‑icing process and the anti‑icing process and that can be performed in one or two steps.

(1) ‘One‑step de‑icing/anti‑icing’. Heated anti‑icing fluid is used to de‑ice the aircraft and remains on the surfaces to which it is applied to provide anti‑icing capability.

(2) ‘Two‑step de‑icing/anti‑icing’. This procedure contains two distinct steps: the first step, de‑icing, is followed by the second step, anti‑icing, as a separate fluid application.

Details

Source-Title: GM1 Article 3(7)&(8) Definitions View latest amendments

Erulesid: ERULES-1963177438-23678 Compare versions

Domain: Ground Handling

Amendedby: Issue 1

Applicabilitydate: 27 March, 2028

Entryintoforcedate: 8 July, 2025

Regulatorysource: ED Decision 2025/007/R Navigate

Regulatorysubject: Cover regulation

Typeofcontent: GM to DR

Origin: EASA

Category: EAR