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Standard

AEROSPACE - HYDRAULIC SYSTEM FLUID CONTAMINATION - LOCATION OF SAMPLING POINTS

1989-10-01
HISTORICAL
ARP4268
The scope of this Aerospace Recommended Practice (ARP) covers where, when, and how often to sample hydraulic system fluid on aerospace vehicles for particulate contamination measurements. The measurement of hydraulic fluid particulate contamination is of concern to the aerospace community because of the critical importance of hydraulic equipment reliability. Contamination is always present in the system fluid, even in new unused fluid. Contamination must be below a level that will not adversely affect system operation. This ARP draws from aerospace industry experience and practice to establish criteria for fluid contamination sampling recommendations in aerospace vehicle hydraulic systems. Fluid samples can then be subjected to measurement of particulate contamination and of other harmful contaminants such as chlorinated solvents and water.
Standard

Aerospace Design and Installation of Commercial Transport Helicopter Hydraulic Systems

2021-08-18
WIP
ARP4925C
This SAE Aerospace Recommended Practice (ARP) establishes the factors which should be considered in the design and installation of a commercial transport rotorcraft hydraulic system, including the applicable airworthiness regulations that affect the hydraulic system. This ARP also provides information and guidelines on the many factors that arise in the design process to provide cost effectiveness, reliability, maintainability and accepted design and installation practices.
Standard

Aerospace Design and Installation of Commercial Transport Helicopter Hydraulic Systems

2014-10-09
CURRENT
ARP4925B
This SAE Aerospace Recommended Practice (ARP) establishes the factors which should be considered in the design and installation of a commercial transport rotorcraft hydraulic system, including the applicable airworthiness regulations that affect the hydraulic system. This ARP also provides information and guidelines on the many factors that arise in the design process to provide cost effectiveness, reliability, maintainability and accepted design and installation practices.
Standard

Test Requirements and Means for Commercial Aircraft Hydraulic Systems

2014-10-08
CURRENT
ARP6200
This SAE Aerospace Recommended Practice (ARP) describes the recommended tests and their associated test means for commercial aircraft hydraulic systems at the system level that are required to demonstrate compliance with the 14 CFR Part 25 and EASA CS 25 airworthiness regulations, and to show that the required level of maturity at the aircraft entry into service (EIS) has been achieved.
Standard

Test Requirements and Means for Commercial Aircraft Hydraulic Systems

2021-01-07
WIP
ARP6200A
This SAE Aerospace Recommended Practice (ARP) describes the recommended tests and their associated test means for commercial aircraft hydraulic systems at the system level that are required to demonstrate compliance with the 14 CFR Part 25 and EASA CS 25 airworthiness regulations, and to show that the required level of maturity at the aircraft entry into service (EIS) has been achieved.
Standard

Commercial Aircraft Hydraulic System Sizing

2021-01-26
CURRENT
ARP6277
The purpose of this SAE Aerospace Recommended Practice (ARP) is to provide guidelines for determining the hydraulic flow demands for all phases of commercial flight including details of sizing of associated hydraulic components such as hydraulic pumps, hydraulic accumulators, hydraulic reservoirs, hydraulic filters, and hydraulic tubing.
Standard

Aerospace - Design and Installation of Commercial Transport Aircraft Hydraulic Systems

2021-08-18
WIP
ARP4752C
This SAE Aerospace Recommended Practice (ARP) provides guidance for the design and installation of a commercial aircraft hydraulic system to meet the applicable requirements, including the applicable airworthiness regulations that affect the hydraulic system design. This ARP also provides information and guidelines on the many factors that arise in the design process to provide cost effectiveness, reliability, maintainability and accepted design and installation practices.
Standard

Aerospace - Design and Installation of Commercial Transport Aircraft Hydraulic Systems

2007-07-05
HISTORICAL
ARP4752A
This SAE Aerospace Recommended Practice (ARP) establishes the requirements for the design and installation of a commercial aircraft hydraulic system, including the applicable airworthiness regulations that affect the hydraulic system. This ARP also provides information and guidelines on the many factors that arise in the design process to provide cost effectiveness, reliability, maintainability and accepted design and installation practices.
Standard

Aerospace - Design and Installation of Commercial Transport Aircraft Hydraulic Systems

2013-12-02
CURRENT
ARP4752B
This SAE Aerospace Recommended Practice (ARP) provides guidance for the design and installation of a commercial aircraft hydraulic system to meet the applicable requirements, including the applicable airworthiness regulations that affect the hydraulic system design. This ARP also provides information and guidelines on the many factors that arise in the design process to provide cost effectiveness, reliability, maintainability and accepted design and installation practices.
Standard

Placarding of Aircraft Hydraulic Equipment to Identify Phosphate Ester Fluid Compatibility

1998-10-01
HISTORICAL
ARP1288A
This ARP defines a recommended placard for readily identifying equipment with aircraft phosphate ester fluid to be used in the aircraft hydraulic systems to assure compatibility between the internal seals/materials and the system fluid. A definition is provided for a durable type and semipermanently attached placard with prescribed text for the permissible fluid are included in the document.
Standard

Placarding of Aircraft Hydraulic Equipment to Identify Phosphate Ester Fluid Compatibility

2012-07-11
CURRENT
ARP1288B
This ARP defines a recommended placard for readily identifying equipment with aircraft phosphate ester fluid to be used in the aircraft hydraulic systems to assure compatibility between the internal seals/materials and the system fluid. A definition is provided for a durable type and semipermanently attached placard with prescribed text for the permissible fluid are included in the document.
Standard

Aerospace - General Requirements for Commercial Aircraft Hydraulic Components

2021-08-18
WIP
AS4941C
This SAE Aerospace Standard (AS) provides general requirements for components that are used in commercial aircraft hydraulic systems. It also includes the 14 CFR Part 25/CS 25 regulations that apply to hydraulic components. It also provides information to be included in the Procurement Specification in Appendix A and a checklist for design reviews in Appendix B. It does not provide requirements for distribution elements such as hoses, pipe fittings and general tubing.
Standard

Aerospace - General Requirements for Commercial Aircraft Hydraulic Components

2007-11-15
HISTORICAL
AS4941A
This SAE Aerospace Standard (AS) provides general requirements for components that are used in commercial aircraft hydraulic systems. It also includes the FAR/JAR/CS 25 regulations that apply to hydraulic components. It is to be used in conjunction with a Procurement Specification for each component. It also provides information to be included in the Procurement Specification in Appendix A and a checklist for design reviews in Appendix B. It does not provide information on distribution elements such as hoses, pipe couplings and general tubing.
Standard

Aerospace - General Requirements for Commercial Aircraft Hydraulic Components

2015-03-09
CURRENT
AS4941B
This SAE Aerospace Standard (AS) provides general requirements for components that are used in commercial aircraft hydraulic systems. It also includes the 14 CFR Part 25/CS 25 regulations that apply to hydraulic components. It also provides information to be included in the Procurement Specification in Appendix A and a checklist for design reviews in Appendix B. It does not provide requirements for distribution elements such as hoses, pipe fittings and general tubing.
Standard

External Hydraulic Leakage for In-Service Components

2013-10-04
HISTORICAL
ARP1084A
The purpose of this SAE Aerospace Recommended Practice (ARP) is to provide guide lines for allowable leakage for in-service aircraft hydraulic components at a nominal 100 °F (38 °C) temperature and to outline the procedure for measuring such leakage. The limits to be applied to any specific aircraft should be adjusted before inclusion in a maintenance manual.
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