ISO 22089:2009
(Main)Aerospace — Hydraulic power transfer units — General specifications
Aerospace — Hydraulic power transfer units — General specifications
ISO 22089:2009 establishes the general requirements for hydraulic Power Transfer Units (PTUs) ISO 22089:2009 covers uni-directional and bi-directional PTUs. ISO 22089:2009 is used in conjunction with the detail specification particular to each application.
Aéronautique — Unités de transfert de puissance hydraulique — Spécifications générales
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 22089
First edition
2009-02-15
Aerospace — Hydraulic power transfer
units — General specifications
Aéronautique — Unités de transfert de puissance hydraulique —
Spécifications générales
Reference number
©
ISO 2009
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ii © ISO 2009 – All rights reserved
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Classification. 8
5 General requirements. 9
5.1 General. 9
5.2 Hydraulic system characteristics. 9
5.3 Airworthiness requirements . 10
5.4 Qualification . 10
6 Functional requirements. 10
6.1 Hydraulic fluid . 10
6.2 PTU pump/motor displacement. 10
6.3 PTU pressure. 11
6.4 PTU pump pressure. 12
6.5 Motor pressure. 14
6.6 Case drain pressures . 14
6.7 Flows. 14
6.8 Leakage. 15
6.9 Speed and direction of rotation. 16
6.10 Efficiency . 18
6.11 Control . 18
6.12 Rated temperature . 21
6.13 Acoustic noise level . 21
6.14 Endurance . 21
6.15 Environmental requirements . 22
7 Detail design requirements. 22
7.1 Dimensionally critical components . 22
7.2 Maintainability features. 22
7.3 Seals. 23
7.4 Lubrication . 23
7.5 Balance . 23
7.6 System separation/rip-stop . 23
7.7 Drive shaft . 23
7.8 Self-contained failure . 23
7.9 Safety wire sealing. 23
7.10 Electro-conductive bonding . 23
7.11 Marking . 24
8 Strength requirements . 24
8.1 Pressure loads . 24
8.2 Proof pressures . 24
8.3 Burst pressure . 25
8.4 Pressure impulse (fatigue). 26
8.5 Pressure and structural load . 26
8.6 Port strength . 26
9 Construction. 26
9.1 Materials. 26
9.2 Corrosion protection . 27
9.3 Castings . 28
10 Installation requirements . 28
10.1 Dimensions. 28
10.2 Mass . 28
10.3 Mounting . 28
10.4 Ports . 28
11 Maintenance. 28
11.1 Maintenance concept. 28
11.2 Service life limitations and storage specifications. 28
12 Reliability . 29
12.1 Equipment compliance. 29
12.2 Requirements . 29
13 Quality assurance provisions. 29
13.1 Responsibility for inspection. 29
13.2 Classification of tests . 29
13.3 Test stand requirements . 29
14 Acceptance tests. 30
14.1 General . 30
14.2 Examination of the product. 30
14.3 Test programme and inspection methods . 30
15 Qualification tests . 35
15.1 Purpose . 35
15.2 Qualification procedure. 35
iv © ISO 2009 – All rights reserved
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
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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 22089 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 10, Aerospace fluid systems and components.
Introduction
Hydraulic power transfer units (PTUs) are designed to transfer hydraulic power, but not hydraulic fluid,
between two independent hydraulic systems, or between hydraulic sub-systems.
This Internationa
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