ISO 3323:2023 PDF

Name: ISO 3323:2023 — Aircraft — Hydraulic components — Marking to indicate the fluid for which a component is approved
SKU: ISO 3323:2023
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Aircraft — Hydraulic components — Marking to indicate the fluid for which a component is approved

Название (английский):

ISO 3323:2023

Aircraft — Hydraulic components — Marking to indicate the fluid for which a component is approved

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 4
Дата публикации:: 16 мая 2023 г.
Издание:: ISO IS 3323 edition 3 version 1
ICS:: 49.080

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Описание (английский):

This document establishes a scheme for the marking of components (other than pipelines, hoses and fittings) used in aircraft hydraulic systems, so that the correct type of fluid is readily apparent during any assembly or testing operations in workshops. The marking is not intended to serve any purpose when a component is installed in an aircraft.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 3323:2023 defines a marking scheme for aircraft hydraulic components (excluding pipelines, hoses and fittings) to indicate the specific hydraulic fluid for which each component is approved. The purpose is to make the correct fluid readily apparent during assembly, testing and workshop operations. The marking is intended for handling and maintenance stages - it is not required to serve any function when the component is installed in-service.

Key topics and requirements

Scope of marking: Applies to components used in aircraft hydraulic systems except pipelines, hoses and fittings (those are covered by ISO 12).

Fluid categories: Marking must state one of the defined fluid types:

Mineral oil base
Synthetic hydrocarbon base
Chlorinated silicone base
Phosphate ester base
Castor base
Silicate ester base

Plate / label design:

Components shall carry a plate or label clearly marked with the fluid name; optional inclusion of a product name or specification number is permitted (e.g., ISO 9940, AS1241, MIL-PRF-5606).
Plates (or labels) must be neutral in colour except for phosphate ester based fluids, which require a violet label specified by CIE chromaticity x = 0.337, y = 0.242 and spectral radiance factor β = 6.5% (CIE standard illuminant B).

Materials & attachment:

Plates shall be durable and resistant to hydraulic fluids and environmental conditions (examples: anodized metal, suitable plastics).
Plates must be securely and visibly fixed; for fluids likely to corrode glued joints (e.g., phosphate ester) mechanical attachment is required.

Sizing & legibility:

Preferred plate dimensions are indicated (examples: 15 × 5 mm, 30 × 10 mm, 50 × 17 mm) with corner radii; lettering should be as large as practicable relative to plate size.

Applications and users

ISO 3323:2023 is primarily used by:

Aircraft component manufacturers (OEMs) specifying identification plates on hydraulic components

Maintenance, repair and overhaul (MRO) workshops and assembly technicians

Procurement and quality assurance teams ensuring fluid compatibility and traceability

Suppliers and parts distributors preparing components for workshop handling

Practical benefits include reduced risk of fluid contamination, clearer maintenance procedures, improved safety during assembly/testing, and easier compliance with procurement and maintenance specifications.

Related standards

ISO 12 - Aerospace - Pipelines - Identification

ISO 9940 - Phosphate ester-base hydraulic fluid (technical specification)

MIL-PRF-5606, MIL-PRF-83282, MIL-PRF-87257 (military hydraulic fluid specs)

SAE AS1241, NSA307110, BMS 3-11

Keywords: ISO 3323, aircraft hydraulic components, fluid identification, identification plate, phosphate ester, hydraulic fluid marking, aerospace maintenance.

ISO 3323:2023 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

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