Electrical Wiring Interconnection System (EWIS)

Aviation accident investigations have specifically cited the need for improved training of personnel to ensure adequate recognition and repair of potentially unsafe wiring conditions. Research has also demonstrated that wiring can be harmed by collateral damage when maintenance is being performed. For example, a person performing an inspection of an electrical power centre or avionics compartment may inadvertently cause damage to wiring in an adjacent area.

The current design and maintenance standards were not adequate to prevent failure criticality of the affected systems. As a consequence, FAA and EASA created a regulatory package identified EAPAS, the Enhanced Airworthiness Program for Aging Systems.

• Demonstrate the safe handling of aeroplane electrical systems, line replaceable units, tooling, troubleshooting procedures and electrical measurement (ESDS).
• Be familiar with construction and navigation of the applicable aircraft wiring system manual or wiring practices.
• Know how to follow the planning procedures, protection procedures and processes to protect EWIS during maintenance and repair.
• Recognise possible contamination sources and know the process to apply for cleaning wiring systems during maintenance and repair.

The objectives and level vary with the group/competency as specified in ED Decision 2008/007/R Appendix A to AMC 20-22. This training provides guidance for personnel directly involved in the maintenance management, maintenance and inspection of EWIS.

This training is targeted at each person who is involved in or performs aeroplane maintenance or inspections on EWIS. The group/competency are as specified in ED Decision 2008/007/R Appendix A to AMC 20-22.

Target Group 1: Qualified staff performing EWIS maintenance

Target Group 2: Qualified staff performing maintenance inspections on EWIS

Target Group 3: Qualified staff performing electrical/avionic engineering on in-service aeroplane

Target Group 4: Qualified staff performing general maintenance/inspections not involving wire maintenance (LRU change is not considered wire maintenance)

Target Group 5: Qualified staff performing other engineering or planning work on in- service aeroplane

Target Group 6: Other service staff with duties in proximity to EWIS

1 to 3 Days (depending on target groups)

ED 2008/007/R Modules included in the training are as follows:

Module A – General EWIS Practices

Module B – Wiring Practices Documentation

Module C- Inspection

Module D- Housekeeping

Module E- Wire

Module F- Connective Devices