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Product Code:SAE ARP1048
Title:Instrument and Cockpit Illumination for General Aviation Aircraft
Issuing Committee:A-20ac Crew Station And Interior Lighting Committee
Scope: The desired system for general aviation aircraft instrument panel and cockpit lighting should furnish light of adequate intensity and distribution under all conditions of external illumination so that the crew may read instrumentation, placards, check lists, manuals, maps, instrument color coding, and distinguish controls without undue interference with their vision outside of the aircraft. Heretofore, considerable effort has been made to insure night vision adaptation at all costs. Efforts to maintain this adaptation have been based on certain military requirements, night flight involving pilotage and takeoffs or landings using only moonlight or less light intensity. With present navigational methods, adequate airport lighting and aircraft landing lights, night vision adaptation is rarely necessary. Lighting at low illumination levels often creates a compromise in visibility within the cockpit which may cause serious problems as a result of improper map reading, improper fuel selection, etc. Adequate and comfortable lighting should, in most instances, be the primary goal. The dangers of inadequate lighting within the cockpit appear to be greater, at present, than the advantages of maintaining night vision.tion, etc. Adequate and comfortable lighting should, in most instances, be the primary goal. The dangers of inadequate lighting within the cockpit appear to be greater, at present, than the advantages of maintaining night vision.tion, etc. Adequate and comfortable lightion, etc. Adequate and comfortable lighting should, in most instances, be the primary goal. The dangers of inadequate lighting within the cockpit appear to be greater, at present, than the advantages of maintaining night vision.tion, etc. Adequate and comfortable lighting should, in most instances, be the primary goal. The dangers of inadequate lighting within the cockpit appear to be greater, at present, than the advantages of maintaining night vision.tion, etc. Adequate and comfortable lighting should, in most instances, be the primary goal. The dangers of inadequate lighting within the cockpit appear to be greater, at present, than the advantages of maintaining night vision.tion, etc. Adequate and comfortable lighting should, in most instances, be the primary goal. The dangers of inadequate lighting within the cockpit appear to be greater, at present, than the advantages of maintaining night vision.ting should, in most instances, be the primary goal. The dangers of inadequate lighting within the cockpit appear to be greater, at present, than the advantages of maintaining night vision.tion, etc. Adequate and comfortable lighting should, in most instances, be the primary goal. The dangers of inadequate lighting within the cockpit appear to be greater, at present, than the advantages of maintaining night vision.Product Code:SAE ARP5935
Title:Use of HVOF Thermal Spray Coatings for Hard Chrome Replacement in Landing Gear Applications
Issuing Committee:A-5 Aerospace Landing Gear Systems Committee
Scope: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. Some of the characteristics of HVOF coatings, such as fatigue and wear resistance are superior to hard chrome plate. Yet, performance characteristics, such as adhesion under very high strains, are clearly different. This document is intended to outline and describe the design and usage guidelines for HVOF tungsten carbide coatings to assure adequate quality and performance of the landing gear equipment. This document is not intended to act as a detailed process specification for applying HVOF coatings. Also, the recommendations in this document do not necessarily apply to certain proprietary spraying systems (i.e., D-Gun驴).The information in this document pertains to HVOF tungsten carbide based coatings applied to high strength steel alloys only, and is not necessarily applicable to other substrates.