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Standard

Landing Gear Based Weight and Balance Systems

2019-04-18
WIP
AIR6941
This document outlines historical systems which have used the landing gear as a sensor or installation point for full aircraft weight and balance systems. A number of systems have been developed, installed, certified, and placed in service but few systems remain in regular use. The document will capture the history of these systems, reasons (where known) for their withdrawal from service, and lessons learned.
Standard

A Guide for the Damaging Effects of Tire and Wheel Failures

2018-04-19
WIP
AIR5699A
Consideration for the damaging effects to aircraft from the failure of wheels and tires should be evaluated. This document discusses the types of problems in-service aircraft have experienced and methodology in place to assist the designers when evaluating threats for new aircraft design. The purpose of this document is to provide a history of in-service problems, provide a historical summary of the design improvements made to wheels and tires during the past 40 years and to offer methodology which has been used to help designers assess the threat to ensure the functionality of systems and equipment located in and around the landing gear and in wheel wells.
Standard

Inflator Assembly and Gage Elements, Pneumatic Pressure, Remote Control, Direct Reading

2018-04-09
CURRENT
AS85352A
This specification covers a direct reading, remote control, pneumatic pressure inflator assembly, for use on aircraft tires and struts having pneumatic pressure requirements up to 600 psi. It includes pressure relief provisions to provide for safe inflation. Also included are dual chuck stem gages for measuring tire pressure.
Standard

Use of HVOF Thermal Spray Coatings for Hard Chrome Replacement in Landing Gear Applications

2016-09-19
WIP
ARP5935A
Electrolytically deposited chrome plate is the current standard surface treatment for landing gear component interface surfaces that require good wear resistance and corrosion protection. Chrome plated components are typically plagued by a slight debit in fatigue performance, detrimental mud cracking surface pattern, susceptibility to scoring, wear, and seal leakage. In addition, recent changes in environmental compliance standards place further restrictions on the use of electrolytically deposited chromium. Some commercial applications have already eliminated the use of chrome plate on current and future products. As a result, a substitute for electrolytically deposited chrome plate has been sought for several years. High Velocity Oxygenated Fuel (HVOF) thermal spray coatings have been developed to the point where they are being implemented as an alternative to hard chrome plate on high strength low alloy steels for external surfaces on landing gear applications.
Standard

Effects of Extremely Cold Temperature on Landing Gear Operation

2016-03-15
WIP
AIR6411
Provide information and guidance for landing gear operation in cold temperature environment. Covers all operational aspects on ground and in flight. Includes effects on: tires, wheels, brakes, shock strut, seals, and actuation.
Standard

Aircraft Shimmy Analysis Methods and Data Requirements

2013-10-21
WIP
AIR6280
This Aerospace Information Report will summarize several existing aircraft landing gear shimmy analysis techniques and provide guidance on the synthesis and testing of tire properties, strut properties, and other landing gear mechanical properties that support the various shimmy analysis methods. This AIR is applicable to large and small fixed wing and rotary wing aircraft for military or civilian use.
Standard

Inflator Assembly and Gage Elements, Pneumatic Pressure, Remote Control, Direct Reading

2002-02-13
HISTORICAL
AS85352
This specification covers a direct reading, remote control, pneumatic pressure inflator assembly, for use on aircraft tires and struts having pneumatic pressure requirements up to 600 psi. It includes pressure relief provisions to provide for safe inflation. Also included are dual chuck stem gages for measuring tire pressure.
Standard

Steering Effect of Tilted, Free-Swiveling Nose Gears

1991-02-27
CURRENT
AIR4358
This Aerospace Information Report (AIR) considers the origin of cornering forces generated by tilted, free-swiveling nose gears; the effect of various landing gear parameters on the measured cornering forces; and a method of towing aircraft to measure the resulting steering forces.
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