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SAE AIR4002

Revision A, November 1, 2012

Complete Document

8000 psi Hydraulic Systems: Experience and Test Results

Includes all amendments and changes through Stabilization Notice (No longer revised / updated) , November 2012


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Product Details:

  • Revision: Revision A, November 1, 2012
  • Published Date: November 2012
  • Status: Active, Most Current
  • Document Language: English
  • Published By: SAE International (SAE)
  • Page Count: 87
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

Shortly after World War II, as aircraft became more sophisticated power-assist, flight-control functions became a requirement, hydraulic system operating pressure rose from systems have been developed for the U.S. Air Force XB-70 and B-1 bombers and a number of European aircraft including the tornado multirole combat aircraft and the Concorde supersonic transport. The V-22 Osprey incorporates a5000 psi hydraulic system. The power levels of military aircraft hydraulic systems have continued to rise. This is primarily due to higher aerodynamic loading, combined with the increased hydraulic functions and operations of each new aircraft. At the same time, aircraft structures and wings have been getting smaller and thinner as mission requirements expand. Thus, internal physical space available for plumbing and components continues to decrease.

In the 1960s, the U.S. Navy began a methodical process of developing lightweight hydraulic systems (LHS) for aircraft. The Navy was keenly aware that aircraft designers would be faced with requirements for higher horsepower hydraulic systems in future high-performance, high-density aircraft. The Air Force has also pursued the use of LHS to complement their Fire Resistant Hydraulic Systems program. One logical way to achieve smaller and lighter weight hydraulic components is to raise the system operating pressure levels. Studies conducted under both Navy and Air Force programs have indicated that 8000 psi hydraulic systems are feasible and can achieve significant weight reduction and space savings for certain aircraft. Many of the hardware elements necessary for 8000 psi hydraulic systems have been designed, fabricated, and tested in the programs discussed herein. The purpose of this document is to outline experience and test results to date when operating hydraulic systems at 8000 psi.
AIA/NAS Aerospace Standards