ISO 18387:2019
(Main)Aerospace — Linear hydraulic utility actuator — General specifications
Aerospace — Linear hydraulic utility actuator — General specifications
This document establishes the general requirements for a linear hydraulic utility actuator, herein referred to as a "utility actuator", for use in flight vehicle hydraulic systems at pressures up to 35 000 kPa (5 000 psi). These requirements include: — design requirements; — test requirements. This document is intended to be used in conjunction with the detail specification that is particular to each application. NOTE Although Brake pistons and Landing Gear Bogie (Truck) Pitch Trimmers are utility actuators, they are outside the scope of this document. This is because these devices are considered to be specialist actuator devices due to their specific duty cycles requiring a separate set of tailored requirements.
Série aérospatiale — Actionneur hydraulique linéaire à usage général — Spécifications générales
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INTERNATIONAL ISO
STANDARD 18387
First edition
2019-09
Aerospace — Linear hydraulic utility
actuator — General specifications
Série aérospatiale — Actionneur hydraulique linéaire à usage général
— Spécifications générales
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 General requirements . 7
4.1 Order of precedence . 7
4.2 Hydraulic system characteristics . 7
4.3 Qualification . 7
4.4 Airworthiness requirements. 7
5 Functional requirements . 7
5.1 General . 7
5.2 Actuator type . 7
5.3 Features incorporated within the utility actuator . 8
5.4 Hydraulic fluid . 8
5.5 Performance . 8
5.5.1 General. 8
5.5.2 Performance cases . . 8
5.5.3 Leakage . 9
5.5.4 Seal and scraper friction .10
5.5.5 End of travel snubbing .10
5.5.6 Utility actuator locking means .10
5.6 Endurance .12
5.6.1 General.12
5.6.2 Duty cycle .12
5.6.3 Endurance test .12
5.7 Fluid and ambient temperature .12
5.8 Fluid cleanliness .13
5.8.1 Operation .13
5.8.2 Malfunction . .13
5.8.3 Equipment delivery .13
5.9 Environmental requirements .13
6 Detail design requirements .14
6.1 General .14
6.2 Prevention of incorrect assembly .14
6.3 Standard parts .14
6.4 Maintainability features .15
6.5 Seals and scrapers .15
6.5.1 General.15
6.5.2 Gland surface finishes.15
6.5.3 Static seals .15
6.5.4 Dynamic seals .16
6.5.5 Scraper rings .16
6.5.6 Back-up rings .16
6.5.7 Lead in chamfers .17
6.6 Fluid porting through interfacing surfaces .17
6.7 Lubrication of hydraulic elements .17
6.8 Orifices .17
6.9 Retainer (snap) rings .17
6.10 Spring rings .18
6.11 Secondary locking .18
6.12 Drainage .18
6.13 Drillings .18
6.14 Fillet radii .18
6.15 Rod ends .18
6.16 Bearings .19
6.16.1 General.19
6.16.2 Lubrication .19
6.16.3 Anti-roll feature .20
6.17 Threaded components .20
6.18 Electro-conductive bonding .20
6.19 Marking .20
6.19.1 Nameplate .20
6.19.2 Fluid identification .21
7 Strength requirements .21
7.1 Hydraulic .21
7.1.1 DOP definition .21
7.1.2 Proof pressure .21
7.1.3 Ultimate (burst) pressure .21
7.1.4 Impulse fatigue .21
7.1.5 Operation at full flow relief pressure .
...
INTERNATIONAL ISO
STANDARD 18387
First edition
2019-09
Aerospace — Linear hydraulic utility
actuator — General specifications
Série aérospatiale — Actionneur hydraulique linéaire à usage général
— Spécifications générales
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 General requirements . 7
4.1 Order of precedence . 7
4.2 Hydraulic system characteristics . 7
4.3 Qualification . 7
4.4 Airworthiness requirements. 7
5 Functional requirements . 7
5.1 General . 7
5.2 Actuator type . 7
5.3 Features incorporated within the utility actuator . 8
5.4 Hydraulic fluid . 8
5.5 Performance . 8
5.5.1 General. 8
5.5.2 Performance cases . . 8
5.5.3 Leakage . 9
5.5.4 Seal and scraper friction .10
5.5.5 End of travel snubbing .10
5.5.6 Utility actuator locking means .10
5.6 Endurance .12
5.6.1 General.12
5.6.2 Duty cycle .12
5.6.3 Endurance test .12
5.7 Fluid and ambient temperature .12
5.8 Fluid cleanliness .13
5.8.1 Operation .13
5.8.2 Malfunction . .13
5.8.3 Equipment delivery .13
5.9 Environmental requirements .13
6 Detail design requirements .14
6.1 General .14
6.2 Prevention of incorrect assembly .14
6.3 Standard parts .14
6.4 Maintainability features .15
6.5 Seals and scrapers .15
6.5.1 General.15
6.5.2 Gland surface finishes.15
6.5.3 Static seals .15
6.5.4 Dynamic seals .16
6.5.5 Scraper rings .16
6.5.6 Back-up rings .16
6.5.7 Lead in chamfers .17
6.6 Fluid porting through interfacing surfaces .17
6.7 Lubrication of hydraulic elements .17
6.8 Orifices .17
6.9 Retainer (snap) rings .17
6.10 Spring rings .18
6.11 Secondary locking .18
6.12 Drainage .18
6.13 Drillings .18
6.14 Fillet radii .18
6.15 Rod ends .18
6.16 Bearings .19
6.16.1 General.19
6.16.2 Lubrication .19
6.16.3 Anti-roll feature .20
6.17 Threaded components .20
6.18 Electro-conductive bonding .20
6.19 Marking .20
6.19.1 Nameplate .20
6.19.2 Fluid identification .21
7 Strength requirements .21
7.1 Hydraulic .21
7.1.1 DOP definition .21
7.1.2 Proof pressure .21
7.1.3 Ultimate (burst) pressure .21
7.1.4 Impulse fatigue .21
7.1.5 Operation at full flow relief pressure .
...
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