Aerospace & Defense Glossary

A family of nickel-chromium-based superalloys known for exceptional high-temperature strength and oxidation resistance. Common grades include Inconel 625, 718, and X-750, used in jet engines, turbine blades, and exhaust systems operating at temperatures exceeding 2000°F.

Nickel-molybdenum-chromium alloys designed for superior corrosion resistance in harsh chemical environments. Hastelloy C-276 and Hastelloy X are widely used in fuel systems, chemical processing equipment, and corrosive aerospace applications.

The most common titanium alloy (Grade 5), containing 6% aluminum and 4% vanadium. Offers excellent strength-to-weight ratio, corrosion resistance, and biocompatibility. Used extensively in airframes, landing gear, and aerospace fasteners.

Precipitation-hardening martensitic stainless steel with high strength, hardness, and corrosion resistance. Used in aerospace applications requiring both structural strength and corrosion protection, such as valve components and fittings.

High-performance alloys that maintain mechanical strength, surface stability, and corrosion resistance at temperatures exceeding 540°C (1000°F). Primarily nickel, cobalt, or iron-based, used in jet engines and gas turbines.

American Society for Testing and Materials - develops and publishes voluntary consensus technical standards for materials, products, systems, and services. ASTM standards (e.g., ASTM B348 for titanium) ensure material quality and consistency.

Aerospace Material Specifications - standards published by SAE International specifically for aerospace materials and processes. AMS specifications (e.g., AMS 5662 for Inconel 718) define exact composition, properties, and testing requirements.

Military Specifications - standards used by the U.S. Department of Defense for materials, products, and processes. MIL-SPEC compliance ensures materials meet stringent military and defense requirements.

Defense Federal Acquisition Regulation Supplement - regulations requiring certain defense materials to be sourced from approved countries. Critical for aerospace and defense procurement compliance.

American Welding Society - develops welding and brazing standards. AWS specifications (e.g., AWS A5.8 for brazing filler metals) ensure quality in joining aerospace components.

Material Test Report documenting the chemical composition, mechanical properties, and test results of a material batch. Essential for aerospace traceability, includes heat number and manufacturing details.

Document certifying that materials or products meet specified requirements and standards. Issued by manufacturers or suppliers to confirm compliance with customer specifications.

Unique identifier assigned to a batch of metal during production, enabling complete traceability from mill to end-use. Critical for aerospace quality control and failure analysis.

Authorized Release Certificate - FAA document certifying that aircraft parts meet approved design data and are in airworthy condition. Required for aviation parts entering service.

Complete documentation chain from raw material production through processing to final delivery, including heat numbers, test reports, and certifications. Mandatory for aerospace and defense applications.

Metal-joining process using filler metal with melting point above 450°C but below the melting point of base materials. Creates strong, leak-tight joints for aerospace fuel systems, heat exchangers, and instrumentation.

Silver-based brazing alloys (e.g., BAg-1, BAg-3) offering excellent flow characteristics and moderate temperature applications. Used for joining stainless steel, copper, and nickel alloys in aerospace hydraulics and fuel systems.

Nickel-based brazing alloys (e.g., BNi-2, BNi-7) for high-temperature applications. Used in jet engine turbine assemblies, exhaust systems, and components operating above 1000°F.

Chemical cleaning agent used during brazing to remove oxides and promote wetting. Available as paste, powder, or pre-applied coatings. Critical for achieving strong, defect-free brazed joints.

Pre-shaped brazing filler metal (rings, washers, shims) designed for specific joint geometries. Ensures consistent filler metal placement and joint quality in production brazing.

Flexible conduit consisting of inner tube, reinforcement layers, and outer cover, with end fittings. Used to transfer hydraulic fluid, fuel, oil, or pneumatic air in aircraft systems. Must withstand extreme pressures and temperatures.

Critical situation where aircraft cannot fly due to missing parts or maintenance issues. AOG support provides expedited delivery of parts to minimize downtime and operational losses.

Company that manufactures parts or equipment sold by another company under their brand name. OEM parts meet original design specifications and quality standards.

Parts Manufacturer Approval - FAA certification allowing manufacturers to produce replacement parts that meet or exceed OEM specifications. Alternative to OEM parts with equivalent quality.

Condition where aircraft and components meet safety standards for flight operations. Maintained through inspections, maintenance, and use of certified parts with proper documentation.

Mechanical lifting device mounted on helicopters for search and rescue operations. Includes cable, hook, and rescue basket or sling. Certified for specific weight capacities (typically 600-1000 lbs).

Rigid stretcher-like device used to lift injured or incapacitated persons from ground or water to helicopter. Features flotation collars for maritime rescues and corrosion-resistant construction.

Operations to locate and assist persons in distress or imminent danger. SAR equipment includes rescue hoists, baskets, flotation devices, and survival gear meeting military specifications.

Military Detail Specification - precise technical requirements for defense products. MIL-DTL specifications for rescue equipment ensure reliability in life-critical situations.

Maximum weight that equipment is designed to safely handle during normal operations. Includes safety factors (typically 3:1 to 5:1) above the working load for emergency situations.