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Screw Threads - UNJ Profile, Inch, Controlled Radius Root with Increased Minor Diameter

2024-05-20
WIP
AS8879E
This project is part of the 5-year cycle review, minor clarification is proposed for the Material limits for coated or plated threads. Also, a short reference to 3BG threads is reinstated (pointing to MIL-S-8879 Rev A) for reference on legacy designs and end user awareness. Finally minor editorial updates are suggested, and tables are digitalized to improve searchability.
Standard

Test Method for the Determination of Water Concentration in Polyol Ester and Diester Aerospace Lubricants by Coulometric Karl Fischer Titration

2024-05-17
CURRENT
ARP5991B
The test method describes the procedure for the direct determination of water concentration in polyol ester and diester based aerospace lubricants by commercially available automated coulometric Karl Fischer titration instruments. The method was validated to cover the water concentration range of 150 to 3500 µg/g. The method may also be suitable for the determination of water concentrations outside this range and for other classes of fluids; however, the precision statement shall not be applicable for such uses.
Standard

Safety Considerations for Electrified Propulsion Aircraft

2024-05-16
WIP
AIR8677
This SAE Aerospace Information Report (AIR) provides information to be considered when performing the safety assessment of electrified propulsion aircraft. Its main focuses are: ● Typical new technologies introduced by electrified propulsion and their impact on safety ● The failure modes of electrified propulsion systems and their components ● Potential effects of failures at system and aircraft levels ● Possible strategies to minimize failures and mitigate their effects The information in this document may be used to generate inputs for system and aircraft safety assessments based on industry standards such as SAE ARP4761. The first issue of this document addresses battery systems, power electronics, eMotors, electrical interconnects and thermal management for fully electric configurations. Future issues are expected to address other subsystems, components and configurations.
Standard

Reliability in the frame of Structure Health Monitoring and Management

2024-05-09
WIP
AIR8950
The document describes typical processes with examples on how to manage reliability assessment hardware and software used on structural health monitoring systems, and for structure health management solutions. It addresses reliability assessment guidelines from design phase, manufacturing, assemblies, installation, considering installation and environmental conditions. Link between Quality system and reliability assessment is developed
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