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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.

 

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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Landing Gear Structures and Mechanisms

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • ARP1311D
  • Current
Published 2018-06-03 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) applies to landing gear structures and mechanisms (excluding wheels, tires, and brakes and other landing gear systems) for all types and models of civil and military aircraft. All axles, wheel forks, links, arms, mechanical and gas/oil shock struts, downlock and uplock assemblies, braces, trunnion beams, and truck beams, etc., that sustain loads originating at the ground, and that are not integral parts of the airframe structure, should be designed and validated in accordance with this document. Hydraulic actuators (retraction, main and nose gear steering, positioning, damping, etc.) should also be included in this coverage. System level, non-structural components such as retraction/extension valves, controllers, secondary structure and mechanisms in the airframe (e.g., manual release mechanisms, slaved doors) as well as equipment that is located in the cockpit are not addressed in this ARP.
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