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Standard

Self-Displacing Hydraulic Accumulator
2018-09-04
CURRENT
ARP4553B
This SAE Aerospace Recommended Practice (ARP) provides recommendations for design and test requirements for self-displacing hydraulic accumulators.
Standard

PUMPS, HYDRAULIC, POWER DRIVEN, VARIABLE DELIVERY COMPOSITE OUTLINE DRAWINGS
2000-09-30
AIR45
Outline drawings from all known pump manufacturers for the various size pumps listed in MIL-P-7740 were requested and those received have been combined to make up the various outline drawings. There has been prepared a composite outline drawing enclosing all of the individual outline drawings. Since the pump manufacturers' drawings will change over a period of time and complete detail is not shown, it is not possible to make a detailed mockup of any specific pump. These drawings are intended to provide information concerning the general space requirement for variable delivery pumps, and could be used to manufacture a composite mockup to indicate roughly the space required on a new engine design.
Standard

Liquid Propellant Gas Generation Systems
2013-06-17
CURRENT
AIR1343B
This information report presents a preliminary discussion of liquid propellant gas generation (LPGG) systems. A LPGG system, as used herein, is defined as a system which stores a liquid propellant and, on command, discharges and converts the liquid propellant to a gas. The LPGG system can interface with a gas-to-mechanical energy conversion device to make up an auxiliary power system. Figure 1 shows a block diagram of LPGG system components which include a propellant tank, propellant expulsion system, propellant control and a decomposition (or combustion) chamber. The purpose of this report is to provide general information on the variety of components and system arrangements which can be considered in LPGG design, summarize advantages and disadvantages of various approaches and provide basic sizing methods suitable for initial tradeoff purposes.
Standard

Liquid Propellant Gas Generation Systems
2007-11-06
HISTORICAL
AIR1343A
This information report presents a preliminary discussion of liquid propellant gas generation (LPGG) systems. A LPGG system, as used herein, is defined as a system which stores a liquid propellant and, on command, discharges and converts the liquid propellant to a gas. The LPGG system can interface with a gas-to-mechanical energy conversion device to make up an auxiliary power system. Figure 1 shows a block diagram of LPGG system components which include a propellant tank, propellant expulsion system, propellant control and a decomposition (or combustion) chamber. The purpose of this report is to provide general information on the variety of components and system arrangements which can be considered in LPGG design, summarize advantages and disadvantages of various approaches and provide basic sizing methods suitable for initial tradeoff purposes.
Standard

High Pressure Pneumatic Compressors Users Guide For Aerospace Applications
2007-11-07
HISTORICAL
AIR4994
Gas compressors (air and other compressible fluids) have been used sporadically since the 1940's for various utility functions in aerospace applications. They have been used to provide power to gun purge and drive systems, engine or APU starters (recharge accumulators), reservoir pressurization, cockpit pressurization, braking systems, canopy seals, engine control devices, landing gear activation, and boosted flight controls (see Table 1). In current state-of-the-art aircraft, most pneumatic system power is extracted from a stage of compression in the turbo-jet engine. As more and more demands are put on new generation engines for fuel economy and performance there is an increasing need for a new source of pneumatic power. This document is intended to describe current state-of-the-art technology in compressors, define the limitations, discuss enhancements needed and attempt to predict the needs of the future.
Standard

High Pressure Pneumatic Compressors Users Guide For Aerospace Applications
2013-11-11
CURRENT
AIR4994A
Gas compressors (air and other compressible fluids) have been used sporadically since the 1940's for various utility functions in aerospace applications. They have been used to provide power to gun purge and drive systems, engine or APU starters (recharge accumulators), reservoir pressurization, cockpit pressurization, braking systems, canopy seals, engine control devices, landing gear activation, and boosted flight controls (see Table 1). In current state-of-the-art aircraft, most pneumatic system power is extracted from a stage of compression in the turbo-jet engine. As more and more demands are put on new generation engines for fuel economy and performance there is an increasing need for a new source of pneumatic power. This document is intended to describe current state-of-the-art technology in compressors, define the limitations, discuss enhancements needed and attempt to predict the needs of the future.
Standard

General Requirements for the Design and Testing of Civil Type Pressure Compensated, Variable Delivery Hydraulic Pumps
2022-11-02
CURRENT
AS595E
This SAE Aerospace Standard (AS) provides general design and test requirements for a flat cut-off pressure compensated, variable delivery hydraulic pump for use in a civil aircraft hydraulic system with a rated system pressure up to 5000 psi (34500 kPa). NOTE: Hydraulic pumps may incorporate features such as a clutch in the input drive, which will not be covered by this standard.
Standard

Gas Motor
2007-11-06
HISTORICAL
ARP719A
It is intended that this SAE Aerospace Recommended Practice (ARP) will set down guidelines for the development and test of gas motors to provide a practical and reliable hot gas rotary actuation mechanism. Specific operational and test requirements shall be specified in a detail specification.
Standard

Gas Motor
2013-06-17
CURRENT
ARP719B
It is intended that this SAE Aerospace Recommended Practice (ARP) will set down guidelines for the development and test of gas motors to provide a practical and reliable hot gas rotary actuation mechanism. Specific operational and test requirements shall be specified in a detail specification.
Standard

GAS MOTOR
1961-12-31
HISTORICAL
ARP719
Gas for the purpose of this ARP shall be defined as the gaseous produces) resulting from the decomposition, dissociation, or combustion of liquid or solid mono or bi-propellants. Where other gases such as heated N2, H2, H2O (steam), etc., which may have similar physical and/or chemical properties as the defined "gas", are used to effect testing economies; they may be considered as being included in this ARP.
Standard

Capability Guidelines for Computer Controlled Test Equipment for Hydraulic Components
2008-07-17
HISTORICAL
ARP4904
This SAE Aerospace Recommended Practice (ARP) establishes software capability guidelines for computer controlled test equipment, hereinafter referred to as automatic test equipment (ATE), for testing hydraulic components. A typical ATE system is shown in Figure 1. The items herein have been selected as potential features which may or may not be applicable to a particular application. This document does not address software development requirements, qualification procedures, or hardware design requirements, but encourages users to refer to existing documents, defined in 2.1.1, for guidance on such issues.
Standard

Capability Guidelines for Computer Controlled Test Equipment for Hydraulic Components
2014-04-24
CURRENT
ARP4904A
This SAE Aerospace Recommended Practice (ARP) establishes software capability guidelines for computer controlled test equipment, hereinafter referred to as automatic test equipment (ATE), for testing hydraulic components. A typical ATE system is shown in Figure 1. The items herein have been selected as potential features which may or may not be applicable to a particular application. This document does not address software development requirements, qualification procedures, or hardware design requirements, but encourages users to refer to existing documents, defined in 2.1.1, for guidance on such issues.
Standard

CIVIL TYPE AIRCRAFT VARIABLE DELIVERY HYDRAULIC PUMP
1992-07-01
HISTORICAL
AS595A
This specification establishes the common requirements and provides a guide for special requirements for variable delivery hydraulic pumps, suitable for use in civil aircraft. It also specifies the methods to be used for demonstrating compliance with these requirements.
Standard

Application Guide for Aerospace Hydraulic Motors
2021-11-09
CURRENT
ARP4940A
This SAE Aerospace Recommended Practice (ARP) is an application guide for fixed and variable displacement hydraulic motors. It provides details of the characteristics of fixed and variable displacement hydraulic motors, architectures, circuit designs, controls, and typical applications. The applications include airborne and defense vehicles with emphasis on high performance applications.
Standard

Application Guide for Aerospace Hydraulic Motors
2014-07-01
HISTORICAL
ARP4940
This SAE Aerospace Recommended Practice (ARP) is an application guide for fixed and variable displacement hydraulic motors. It provides details of the characteristics of fixed and variable displacement hydraulic motors, architectures, circuit designs, controls, and typical applications. The applications include airborne and defense vehicles with emphasis on high performance applications.
Standard

Aerospace – System Integration Factors That Affect Hydraulic Pump Life
2022-11-18
CURRENT
AIR1922B
This SAE Aerospace Information Report presents the following factors that affect hydraulic pump life and performance: a The need to supply hydraulic fluid at the correct pressure and quality to the pump inlet port b Considerations for the pump output c Factors to be considered for the pump case drain lines d The mounting of the hydraulic pump e Hydraulic fluid properties, including cleanliness
Standard

Aerospace – Military Type Variable Delivery, Pressure Compensated Hydraulic Pump
2022-05-18
WIP
AS19692C
This SAE Aerospace Standard (AS) establishes the general requirements for the design, construction, acceptance, and qualification testing of flat cut-off pressure compensated, variable delivery hydraulic pumps used in military aircraft hydraulic systems. It also provides parameters for a Procurement Specification to be used in conjunction with this AS. The hydraulic pumps defined by this AS are generally for use in aircraft hydraulic systems conforming to and as defined in AS5440 and MIL-H-8891, as applicable. NOTES: 1. Hydraulic pumps may incorporate features such as a clutch in the input drive, which will not be covered by this standard. 2. AS595 should be used for commercial aircraft hydraulic pumps. 3. This document should not be used for hydraulic pumps in Electro-Hydrostatic Actuator applications (EHAs).
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