Overview
IEC TS 62647-23:2013 - Process management for avionics: Rework and repair guidance for aerospace and defence electronic systems containing lead-free solder and mixed assemblies. This Technical Specification provides technical background, procurement guidance, engineering procedures and practical guidelines to assist organizations in reworking and repairing avionics and high-performance electronics originally assembled with Sn–Pb, Pb‑free, or mixed solders and surface finishes. The focus is on removal and replacement of piece parts and on giving repair technicians a structured, risk-aware process based on industry knowledge at time of publication.
Key topics and technical requirements
- Pb-free concerns and reliability: mixed‑metallurgy effects, reliability implications and configuration management.
- Risk management: identifying and mitigating process and material risks when working with mixed solder systems.
- Materials: solder alloys and forms, flux types, piece‑part termination finishes, area arrays (BGA/CSP) and PCB surface finishes.
- Failure modes: tin whiskers, copper dissolution/erosion and their mitigation strategies (e.g., under‑platings, coatings).
- Equipment and process controls: hand soldering tools, tip selection and life, convective/reflow considerations, thermal profiling for Pb‑free processes.
- Pre‑rework controls: alloy identification techniques (IPC/JEDEC J‑STD‑609A guidance, XRF, Pb swabs), CCA and piece‑part preparation and marking.
- Rework/repair processes: conductive hand soldering, convective reflow and solder paste handling, paste printing and reflow process considerations.
- Post‑rework processes: cleaning, inspection and reapplication of conformal coatings.
- Training and documentation: technician competency, process order of precedence and configuration control.
Applications
IEC TS 62647-23 is practical guidance for:
- Rework and repair of avionics printed circuit card assemblies (PCAs/CCAs) with mixed solder systems.
- Managing transitions from Sn–Pb to Pb‑free production or mixed fielded fleets.
- Establishing repair work instructions, process controls and acceptance criteria for high‑reliability aerospace and defence electronics.
Who should use this standard
- Avionics/defence OEMs and subcontractors
- Field repair stations and maintenance organizations
- Quality, reliability and procurement engineers
- Repair technicians and process engineers handling BGA, fine‑pitch, and mixed‑metallurgy assemblies
- Certification and configuration management teams
Related standards
- Other parts of the IEC 62647 series (e.g., IEC/TS 62647‑1, ‑2, ‑21, ‑22) for broader process management and compatibility guidance
- IPC/JEDEC specifications referenced for alloy identification (e.g., IPC/JEDEC J‑STD‑609A)
Keywords: IEC TS 62647-23:2013, rework and repair guidance, lead-free electronics, mixed assemblies, avionics, aerospace and defence, tin whiskers, solder alloys, XRF, IPC/JEDEC.