ISO 23935-2006 PDF

Full title and description

ISO 23935:2006 — Aircraft — Environmental test procedures for airborne fluid system components — Resistance to fire in designated fire zones. This International Standard specifies test requirements for fluid-system components located in aircraft zones designated as "fire zones" and defines minimum levels of resistance to fire for those components.

Abstract

ISO 23935:2006 defines environmental test procedures for airborne fluid-system components intended to operate in designated fire zones. It specifies which tests are applicable, defines grades of fire resistance for components, and clarifies that it does not apply to flammability requirements outside designated fire zones or to flames originating from combustion chambers.

General information

• Status: Published (confirmed at systematic review; remains current).
• Publication date: June 2006 (published 14 June 2006, edition 1).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.080 (Aircraft — hydraulic and fluid systems).
• Edition / version: Edition 1 (2006).
• Number of pages: 5 pages.

Scope

This standard specifies the requirements for tests that may be applied to fluid-system components located in aircraft areas designated as "fire zones". It covers the minimum levels for components to withstand exposure to a standard flame in those zones and excludes resistance-to-fire outside designated fire zones, general flammability requirements, and conditions produced by the combustion-chamber flame. Normative references include related ISO procedures (for example ISO 2685). Safety precautions for personnel conducting fire tests are noted.

Key topics and requirements

• Definition and application of "designated fire zones" within aircraft and identification of which fluid-system components fall within their scope.
• Test methods and acceptance criteria for fire resistance of fluid-system components (designation of resistance grades such as "fire resistant" and "fireproof" with time-based exposure criteria).
• Clarification of exclusions: does not cover flammability requirements outside designated zones or flame conditions coming from combustion chambers.
• Normative references and alignment with related ISO procedures (notably ISO 2685 for equipment resistance to fire in designated fire zones).
• Health and safety precautions for personnel performing fire tests (risks from flame, smoke and combustion products).

Typical use and users

Used by aircraft designers, OEMs and suppliers of hydraulic/fluid-system components, certification and regulatory authorities, and accredited test laboratories to specify and verify fire-resistance performance of components installed in aircraft fire zones. It supports certification evidence and supplier qualification for components intended for service within designated fire zones.

Related standards

Key related documents include ISO 2685:1998 (Aircraft — Environmental test procedure for airborne equipment — Resistance to fire in designated fire zones), which covers equipment and structures, and industry environmental-test standards such as RTCA DO-160 (Environmental Conditions and Test Procedures for Airborne Equipment / EUROCAE ED-14) that govern broader environmental testing for airborne systems. These documents are frequently cross-referenced when establishing test programs for onboard components and equipment.

Keywords

aircraft, fire resistance, fluid system components, environmental test procedures, designated fire zones, ISO 23935, aircraft certification, fire test, hydraulic systems.

FAQ

Q: What is this standard?

A: ISO 23935:2006 is an ISO International Standard that specifies environmental test procedures for airborne fluid-system components to assess their resistance to fire when installed in aircraft zones designated as "fire zones".

Q: What does it cover?

A: It covers test requirements, grades of fire resistance, and the application of those tests to fluid-system components located in designated fire zones. It explicitly excludes flammability requirements outside designated fire zones and flame conditions produced by combustion chambers.

Q: Who typically uses it?

A: Aircraft manufacturers, component suppliers (hydraulic/fluid systems), test laboratories, and certification bodies use the standard to define and verify component fire-resistance performance for installation in aircraft fire zones.

Q: Is it current or superseded?

A: ISO 23935:2006 is published as edition 1 (2006). The ISO record shows it was last reviewed and confirmed (systematic review) in 2020 and remains current as of that review. Users should check the ISO catalogue or national standards bodies for any later changes or withdrawal proposals.

Q: Is it part of a series?

A: It is part of the family of ISO standards addressing resistance to fire in aircraft (e.g., ISO 2685 covers airborne equipment and structures). ISO 23935 addresses specifically fluid-system components and references other ISO procedures where applicable.

Q: What are the key keywords?

A: Keywords include: fire zones, fire resistance, fluid-system components, aircraft environmental tests, ISO 23935, hydraulic systems, certification.