ISO 8913:2006

INTERNATIONAL ISO
STANDARD 8913
Third edition
2006-11-01
Aerospace — Lightweight
polytetrafluoroethylene (PTFE) hose
assemblies, classification
400 °F/3 000 psi (204 °C/20 684 kPa) and
204 °C/21 000 kPa (400 °F/3 046 psi) —
Procurement specification
Aéronautique et espace — Tuyauteries flexibles en
polytétrafluoroéthylène (PTFE), série légère, classification
400 °F/3 000 psi (204 °C/20 684 kPa) et 204 °C/21 000 kPa
(400 °F/3 046 psi) — Spécification d'approvisionnement

Reference number
©
ISO 2006
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ii © ISO 2006 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Classification. 2
4 Requirements . 2
4.1 Qualification . 2
4.2 Materials . 2
4.3 Construction. 3
4.4 Inner tube. 4
4.5 Hose . 5
4.6 Screw threads . 7
4.7 Part numbering of interchangeable parts . 7
4.8 Identification of products. 7
4.9 Workmanship . 8
4.10 Hose assembly — Test and performance requirements . 8
5 Quality assurance. 13
5.1 Responsibility for inspection . 13
5.2 Classification of inspections . 13
5.3 Qualification inspections . 13
5.4 Quality conformance inspections . 15
5.5 Test conditions . 17
5.6 Inspection methods. 18
6 Preparation for delivery . 18
6.1 Storage and packaging . 18
6.2 Marking . 18
7 Ordering data . 18
Annex A (informative) Equivalent hose assembly product standards governed by ISO 8913 . 20
Annex B (normative) Equivalent national qualification procedure and fire resistance specification. 21
Annex C (informative) Equivalent materials . 22
Bibliography . 25

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 8913 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 10, Aerospace fluid systems and components.
This third edition cancels and replaces the second edition (ISO 8913:1994). Criteria for imperial dimension
(inch-based) hose assemblies as used for commercial aviation are being introduced.
iv © ISO 2006 – All rights reserved

Introduction
This International Standard establishes the basic performance and quality requirements for lightweight
polytetrafluoroethylene (PTFE) hose assemblies for use in aerospace fluid systems.
The procurement requirements are intended to ensure that hose assemblies which are procured in
accordance with this specification are of the same quality as the hose assemblies used during the original
qualification testing. Compliance with these test and procurement requirements is necessary for hose
assemblies that are used in fluid systems where a malfunction would affect the safety of flight.

INTERNATIONAL STANDARD ISO 8913:2006(E)

Aerospace — Lightweight polytetrafluoroethylene (PTFE) hose
assemblies, classification 400 °F/3 000 psi (204 °C/20 684 kPa)
and 204 °C/21 000 kPa (400 °F/3 046 psi) — Procurement
specification
1 Scope
This International Standard specifies requirements for lightweight polytetrafluoroethylene (PTFE) hose
assemblies for use in aircraft hydraulic systems at temperatures between − 55 °C and 204 °C (− 65 °F and
400 °F), and at a nominal pressure up to 3 000 psi (20 684 kPa) or 21 000 kPa (3 046 psi). The hose
assemblies are also suitable for use within the same temperature and pressure limitations in aircraft
pneumatic systems where some gaseous diffusion through the wall on the PTFE liner may be tolerated.
The use of these hose assemblies in high-pressure pneumatic storage systems is not recommended. In
addition, installations in which the limits specified in this International Standard are exceeded, or in which the
application is not covered specifically by this International Standard, for example for oxygen, are subject to the
approval of the purchaser.
Annex A is a listing of hose assembly procurement standards conforming to this International Standard.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 2685:1998, Aircraft — Environmental test procedure for airborne equipment — Resistance to fire in
designated fire zones
ISO 2859-1:1999, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 3161:1999, Aerospace — UNJ threads — General requirements and limit dimensions
ISO 5855-3:1999, Aerospace — MJ threads — Part 3: Limit dimensions for fittings for fluid systems
ISO 6772:1988, Aerospace — Fluid systems — Impulse testing of hydraulic hose, tubing and fitting
assemblies
ISO 7258:1984, Polytetrafluoroethylene (PTFE) tubing for aerospace applications — Methods for the
determination of the density and relative density
ISO 8829:1990, Aerospace — Polytetrafluoroethylene (PTFE) hose assemblies — Test methods
ISO 8829-2, Aerospace — Test methods for polytetrafluoroethylene (PTFE) inner-tube hose assemblies —
Part 2: Non-metallic braid
EN 9100, Aerospace series — Quality management systems — Requirements (based on ISO 9001:2000) and
Quality systems — Model for quality assurance in design, development, production, installation and servicing
(based on ISO 9001:1994)
EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace
standard parts
SAE AS150, Hose assembly, type classifications of, basic performance and fire resistance
SAE AS1055, Fire testing of flexible hose, tube assemblies, coils, fittings and similar system components
SAE AS7003, Nadcap program requirements
SAE AS7112, National aerospace and defense contractors accreditation program (Nadcap) requirements for
fluid system components
ASTM A262, Standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels
PRI PD2101, Aerospace quality assurance, product standards, qualification procedure, fluid systems
3 Classification
Hose assemblies furnished under this International Standard shall be classified as follows:
⎯ Type A — 3 000 psi (20 684 kPa) pressure system,
⎯ Type B — 21 000 kPa (3 046 psi) pressure system.
When no classification is specified by reference to this International Standard, type B shall apply.
4 Requirements
4.1 Qualification
4.1.1 General
Hose assemblies supplied in accordance with this International Standard shall be representative of products
which have been subjected to and which have successfully passed the requirements and tests specified in
this International Standard.
4.1.2 Manufacturer qualification
Manufacturer approval shall be granted by outside agency procedure as specified in Table B.1, procedure
no. 1).
4.1.3 Product qualification
Product approval shall be granted by outside agency procedure as specified in Table B.1, procedure no. 2.
4.2 Materials
4.2.1 General
The hose assembly materials shall be as described in this International Standard (see, in particular,
Table C.1). All materials not specifically described in this International Standard shall be of the highest quality
and suitable for the purpose intended.
2 © ISO 2006 – All rights reserved

4.2.2 Metals
Metals used in the hose and fittings shall be corrosion-resistant steel, nickel alloy or titanium, and shall
conform to the applicable specifications given in Table 1 (or equivalent specifications; see Annex C).
4.3 Construction
4.3.1 General
The hose assembly shall consist of:
⎯ a seamless PTFE inner tube (see 4.3.2),
⎯ corrosion-resistant steel wire reinforcement (see 4.3.3), and
⎯ corrosion-resistant steel, nickel alloy and/or titanium end fittings (see 4.3.4),
as required to meet the construction and performance requirements laid down in this International Standard
and as required for its intended use.
4.3.2 Inner tube
The inner tube shall be of a seamless construction of PTFE resin of uniform gauge; it shall have a smooth
bore and shall be free from pitting and projections on
...