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Gland Design: Nominal 3/8 Inch Cross Section for Compression-Type Seals

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • AS4832A
  • Current
Published 2019-06-17 by SAE International in United States
This SAE Aerospace Standard (AS) offers gland details for a 0.364 inch (9.246 mm) cross-section gland (nominal 3/8 inch) with proposed gland lengths for compression-type seals with two backup rings over a range of 7 to 21 inches (178 to 533 mm) in diameter. The dash number system used is similar to AS568A. A 600 series has been chosen as a logical extension of AS568A, and the 625 number has been selected for the initial number, since 300 and 400 series in MIL-G-5514 and AS4716 begin with 325 and 425 sizes. Seal configurations and design are not a part of this document. This gland is for use with compression-type seals including, but not limited to, O-rings, T-rings, D-rings, cap seals, etc.
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Aircraft Nosewheel Steering/Centering Systems

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • AIR1752A
  • Current
Published 2019-04-17 by SAE International in United States
The intent of this AIR is twofold: (1) to present descriptive summary of aircraft nosewheel steering and centering systems, and (2) to provide a discussion of problems encountered and “lessons learned” by various airplane manufacturers and users. This document covers both military aircraft (land-based and ship-based) and commercial aircraft. It is intended that the document be continually updated as new aircraft and/or new “lessons learned” become available.
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Design and Verification of Aircraft Nose Wheel Steering Systems

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • ARP1595B
  • Current
Published 2019-04-17 by SAE International in United States
This document provides recommended practices for the design, development, and verification testing of NWS systems.
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Landing Gear Shock Absorption Testing of Civil Aircraft

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • ARP5644
  • Current
Published 2019-04-17 by SAE International in United States
The intent of this document is to provide recommended practices for conducting shock absorption testing of civil aircraft landing gear equipped with oleo-pneumatic shock absorbers. The primary focus is for Part 25 aircraft, but differences for Part 23, 27, and 29 aircraft are provided where appropriate.
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Arresting Hook Installation, Land-Based Aircraft

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • ARP1538B
  • Current
Published 2019-04-17 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) covers the recommended criteria and performance requirements for the design and installation of land-based aircraft emergency and operational arresting hooks for use on runway arresting systems. Design criteria for fully operational hooks and for carrier-based aircraft hook installations are contained in specification MIL-A-18717.
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Landing Gear Common Repair

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • AIR5885A
  • Current
Published 2019-04-11 by SAE International in United States
This document outlines the most common repairs used on landing gear components. It is not the intention of this AIR to replace overhaul/component maintenance or technical order manuals, but it can serve as a guide into their preparation. Refer to the applicable component drawings and specifications for surface finish, thickness, and repair processing requirements. This document may also be used as a guide to develop an MRB (Material Review Board) plan. The repairs in this document apply to components made of metallic alloys. These repairs are intended for new manufactured components and overhauled components, including original equipment manufacturer (OEM)/depot and in-service repairs. The extent of repair allowed for new components as opposed to in-service components is left to the cognizant engineering authorities. Reference could be made to this document when justifying repairs on landing gears. For repairs outside the scope of this document, a detailed justification is necessary. Landing gear repair is often a combination of several repair types defined herein. It must be understood that all the repairs listed in this document are not…
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Landing Gear Shock Strut Bearing Selection

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • AIR5883A
  • Current
Published 2018-10-16 by SAE International in United States
This document defines the criteria used for the selection of landing gear shock strut upper and lower bearings (see Figure 1).
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External Hydraulic Fluid Leakage Definition for Landing Gear Shock Absorbers

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • ARP6408
  • Current
Published 2018-07-25 by SAE International in United States
The purpose of this SAE Aerospace Recommended Practice (ARP) is to provide a practical definition of external hydraulic fluid leakage exhibited by landing gear shock absorbers/struts. The definition will outline normal (acceptable weepage) and excessive leakage (unacceptable leakage) of shock absorbers/struts that is measurable. The definition of leakage is applicable to new gear assemblies, refurbished/remanufactured (overhauled) shock absorbers/struts, leakage of shock absorbers/struts encountered during acceptance flights, newly delivered and in-service aircraft. This ARP is intended to provide guidelines for acceptable leakage of landing gear shock absorbers/struts between the ambient temperatures of -65 °F (-54 °C) and 130 °F (54 °C) and to outline the procedure for measuring such leakage. The specific limits that are applied to any particular aircraft shall be adjusted by the aircraft manufacturer before inclusion in the applicable maintenance manual.
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Landing Gear Servicing

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • ARP5908A
  • Current
Published 2018-07-03 by SAE International in United States
The present document addresses gas and hydraulic fluid servicing required on commercial and military aircraft landing gears, for both single and dual chamber (also known as dual stage and two stage) shock struts. This document should be considered as landing gear industry recommended practice but in no way is meant to supersede the shock strut OEM’s published procedures.
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Landing Gear Component Heat Damage

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • AIR5913A
  • Current
Published 2018-07-02 by SAE International in United States
The purpose of this report is to outline types of in-service heat damage that have been observed in high strength steel landing gear components, with an emphasis on a particular type that is referred to as “Ladder Cracking” which can develop in landing gear shock struts. The report discusses how ladder cracking can be detected visually and evaluated by non-destructive inspection methods, and how it can be repaired at overhaul with the prior approval of the Original Equipment Manufacturer. This report also describes the use of a bearing material that has resolved this problem without introducing other problems. Examples of other types of service induced heat damage are also discussed.
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