Aerospace series — AC induction electric motor driven, variable delivery, hydraulic pumps — General requirements

ISO 18170:2017 establishes the general requirements for electric motor driven, variable delivery, hydraulic pumps suitable for use in aircraft hydraulic systems. ISO 18170:2017 includes the general requirements for Alternating Current (AC) induction electric motor powered units. The AC power electrical power supply can be either controlled to provide a Constant Frequency (CF) or uncontrolled to provide a Variable Frequency (VF) AC supply to the electric motor. ISO 18170:2017 is intended to be used in conjunction with the detail specification that is particular to each application.

Série aérospatiale — Pompes hydrauliques à débit variable, actionnées par des moteurs électriques à induction CA — Exigences générales

General Information

Status
Published
Publication Date
02-May-2017
Current Stage
9060 - Close of review
Due Date
02-Sep-2022
Ref Project

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ISO 18170:2017 - Aerospace series -- AC induction electric motor driven, variable delivery, hydraulic pumps -- General requirements
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INTERNATIONAL ISO
STANDARD 18170
First edition
2017-04
Aerospace series — AC induction
electric motor driven, variable
delivery, hydraulic pumps — General
requirements
Série aérospatiale — Pompes hydrauliques à débit variable,
actionnées par des moteurs électriques à induction CA — Exigences
générales
Reference number
ISO 18170:2017(E)
ISO 2017
---------------------- Page: 1 ----------------------
ISO 18170:2017(E)
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© ISO 2017, Published in Switzerland

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ii © ISO 2017 – All rights reserved
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ISO 18170:2017(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 General requirements ..................................................................................................................................................................................... 8

4.1 Order of precedence ........................................................................................................................................................................... 8

4.2 Electrical system characteristics ............................................................................................................................................. 8

4.3 Hydraulic system characteristics ............................................................................................................................................ 8

4.4 Airworthiness requirements....................................................................................................................................................... 8

4.5 Qualification .............................................................................................................................................................................................. 8

5 Functional requirements ............................................................................................................................................................................. 8

5.1 Functional requirements - electrical .................................................................................................................................... 8

5.1.1 AC power requirements ............................................................................................................................................. 8

5.1.2 Electromagnetic interference ............................................................................................................................10

5.1.3 Electrical bonding ........................................................................................................................................................10

5.1.4 Protection requirements ........................................................................................................................................11

5.1.5 Electric motor cooling methods ......................................................................................................................11

5.2 Functional requirements — Hydraulic ...........................................................................................................................12

5.2.1 Hydraulic fluid ................................................................................................................................................................12

5.2.2 EMP pump pressure ...................................................................................................................................................12

5.2.3 Inlet pressure ...................................................................................................................................................................13

5.2.4 Case drain pressures .................................................................................................................................................13

5.2.5 Flows .......................................................................................................................................................................................14

5.2.6 EMP pump characteristics ....................................................................................................................................15

5.2.7 Rated speed .......................................................................................................................................................................15

5.2.8 Efficiency .............................................................................................................................................................................17

5.2.9 Heat rejection ..................................................................................................................................................................18

5.2.10 Variable delivery control ........................................................................................................................................18

5.2.11 Rated temperature ......................................................................................................................................................21

5.2.12 Dry running .......................................................................................................................................................................21

5.3 Functional requirements — EMP integrated assembly ....................................................................................21

5.3.1 Acoustic noise level ....................................................................................................................................................21

5.3.2 Endurance ...........................................................................................................................................................................21

5.4 Environmental requirements ..................................................................................................................................................21

6 Detailed design requirements .............................................................................................................................................................22

6.1 Dimensionally critical components ....................................................................................................................................22

6.2 Maintainability features ...............................................................................................................................................................22

6.3 Seals ...............................................................................................................................................................................................................22

6.4 Lubrication ..............................................................................................................................................................................................22

6.5 Balance ........................................................................................................................................................................................................23

6.6 Self-contained failure .....................................................................................................................................................................23

6.7 Safety wire sealing ............................................................................................................................................................................23

6.8 Electro-conductive bonding ......................................................................................................................................................23

6.9 Marking ......................................................................................................................................................................................................23

6.9.1 Nameplate ...........................................................................................................................................................................23

6.9.2 Fluid identification ......................................................................................................................................................24

6.9.3 Ports .........................................................................................................................................................................................24

6.9.4 Direction of rotation ..................................................................................................................................................24

6.9.5 Electrical connection details ...............................................................................................................................24

7 Strength requirements ................................................................................................................................................................................24

7.1 General ........................................................................................................................................................................................................24

7.2 Electric motor .......................................................................................................................................................................................24

© ISO 2017 – All rights reserved iii
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ISO 18170:2017(E)

7.2.1 Motor case ..........................................................................................................................................................................24

7.3 Hydraulic pump requirements ...............................................................................................................................................24

7.3.1 Pressure loads .................................................................................................................................................................24

7.3.2 Proof pressure .................................................................................................................................................................25

7.3.3 Ultimate pressure .........................................................................................................................................................25

7.3.4 Pressure impulse (fatigue) ...................................................................................................................................25

7.3.5 Port strength.....................................................................................................................................................................26

8 Construction ...........................................................................................................................................................................................................26

8.1 Materials ....................................................................................................................................................................................................26

8.1.1 General...................................................................................................................................................................................26

8.1.2 Metals .....................................................................................................................................................................................26

8.2 Corrosion protection .......................................................................................................................................................................27

8.2.1 General...................................................................................................................................................................................27

8.2.2 Ferrous and copper alloys ....................................................................................................................................27

8.2.3 Aluminium alloys ..........................................................................................................................................................28

8.3 Castings ......................................................................................................................................................................................................28

9 Installation requirements........................................................................................................................................................................28

9.1 Dimensions ..............................................................................................................................................................................................28

9.2 Mass ...............................................................................................................................................................................................................28

9.2.1 General...................................................................................................................................................................................28

9.2.2 Centre of mass .................................................................................................................................................................28

9.3 Mounting ...................................................................................................................................................................................................28

9.4 Orientation ..............................................................................................................................................................................................28

9.5 Hydraulic ports ....................................................................................................................................................................................28

9.6 Electrical connections ....................................................................................................................................................................29

10 Maintenance ...........................................................................................................................................................................................................29

10.1 Maintenance concept ......................................................................................................................................................................29

10.2 Service life limitations and storage specifications ................................................................................................29

11 Reliability ..................................................................................................................................................................................................................29

11.1 Equipment compliance .................................................................................................................................................................29

11.2 Requirements ........................................................................................................................................................................................29

12 Quality assurance provisions ...............................................................................................................................................................29

12.1 Responsibility for inspection ...................................................................................................................................................29

12.2 Classification of tests ......................................................................................................................................................................30

12.3 Test stand requirements ..............................................................................................................................................................30

12.3.1 General...................................................................................................................................................................................30

12.3.2 Hydraulic requirements ..........................................................................................................................................30

12.3.3 Electrical requirements ..........................................................................................................................................30

13 Acceptance tests .................................................................................................................................................................................................31

13.1 General ........................................................................................................................................................................................................31

13.2 Examination of the product ......................................................................................................................................................31

13.3 Test program ..........................................................................................................................................................................................31

13.3.1 General...................................................................................................................................................................................31

13.3.2 Electrical checks ............................................................................................................................................................31

13.3.3 Hydraulic checks ...........................................................................................................................................................32

13.3.4 Break-in run ......................................................................................................................................................................32

13.3.5 Proof pressure test ......................................................................................................................................................32

13.3.6 Load cycles .........................................................................................................................................................................32

13.3.7 Tear-down inspection ........................................................................................................................................... ....33

13.3.8 Run-in .....................................................................................................................................................................................33

13.3.9 Functional tests ..............................................................................................................................................................33

13.3.10 Pressure control test ...............................................................................................................................................34

13.3.11 Calibration .......................................................................................................................................................................34

13.3.12 Efficiency check ...........................................................................................................................................................35

13.3.13 Wear test ...........................................................................................................................................................................35

iv © ISO 2017 – All rights reserved
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ISO 18170:2017(E)

13.3.14 Electro-conductive bonding .............................................................................................................................36

13.3.15 Storage and packaging ..........................................................................................................................................36

14 Qualification tests ............................................................................................................................................................................................36

14.1 Purpose .......................................................................................................................................................................................................36

14.2 Qualification procedure ................................................................................................................................................................37

14.2.1 Qualification by analogy .........................................................................................................................................37

14.2.2 EMP qualification test report .............................................................................................................................37

14.2.3 Samples and program of qualification tests ..........................................................................................37

14.2.4 Dimensional check ......................................................................................................................................................38

14.2.5 Expanded envelope acceptance tests ..........................................................................................................38

14.2.6 Proof pressure and load cycle tests ..............................................................................................................38

14.2.7 Calibration ..........................................................................................................................................................................38

14.2.8 Maximum pressure and response time tests ........................................................................................39

14.2.9 Heat rejection test ........................................................................................................................................................41

14.2.10 Loss of cooling .................................................................................................................................................................41

14.2.11 Electrical tests ..............................................................................................................................................................42

14.2.12 Endurance test ...............................................................................................................................................................43

14.2.13 Minimum inlet pressure test ............................................................................................................................48

14.2.14 Dry run test .....................................................................................................................................................................48

14.2.15 Environmental tests ..................................................................................................................................................48

14.2.16 Structural tests ..............................................................................................................................................................50

14.2.17 Explosion proof test .................. ......................................................................................................................... ......52

14.2.18 Short circuit test .........................................................................................................................................................52

14.2.19 Drive coupling shear test ....................................................................................................................................52

14.2.20 Supplementary tests ...............................................................................................................................................53

Bibliography .............................................................................................................................................................................................................................54

© ISO 2017 – All rights reserved v
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ISO 18170:2017(E)
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

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electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

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This document was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles,

Subcommittee SC 10, Aerospace fluid systems and components.
vi © ISO 2017 – All rights reserved
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INTERNATIONAL STANDARD ISO 18170:2017(E)
Aerospace series — AC induction electric motor
driven, variable delivery, hydraulic pumps — General
requirements
1 Scope

This document establishes the general requirements for electric motor driven, variable delivery,

hydraulic pumps suitable for use in aircraft hydraulic systems.

This document includes the general requirements for Alternating Current (AC) induction electric motor

powered units. The AC power electrical power supply can be either controlled to provide a Constant

Frequency (CF) or uncontrolled to provide a Variable Frequency (VF) AC supply to the electric motor.

This document is intended to be used in conjunction with the detail specification that is particular to

each application.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 2093, Electroplated coatings of tin — Specification and test methods
ISO 2669, Environmental tests for aircraft equipment — Ste
...

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