EWIS Electrical Wiring Interconnection System

Specialised Training Course

Overview of Rulemaking in regards of the EWIS. Reminder of the standard or “best Practices” regarding electrical wiring interconnections.





  • Language: German-English
  • Duration: 1 days

Course Objectives

The course aims to fulfil the following pedagogical objectives:

After this one-day training course, the participants will be able to properly evaluate the EWIS and effectively use the manufacturers AMM Chapter 20 and Electrical Standard Wiring Practice Manual (EWSPM).

The course provides the participants with the necessary knowledge to understand and interpret the EWIS concepts from regulatory requirements and manufacturer’s maintenance documentation.

The training course provides guidance for personnel of the target groups 1 – 6 as defined in AMC 20-22, which are directly involved in the maintenance and inspection of EWIS as well as for personnel performing general maintenance activities in close proximity of EWIS.

Course Curriculum

  • Familiarisation with the elements of EWIS
  • Overview of the history and background and recognise the elements requiring consideration in relation to EWIS
  • Overview of the EASA and FAA regulatory requirements
  • Overview of the Subpart H to EASA CS 25
  • Overview of EASA AMC guidance material AMC 20-21, -22 & -23
  • Overview of the impact of EWIS on the Part CAMO continuing airworthiness management, Part-145 maintenance on affected aircraft and components intended to be fitted thereto.
  • General electrical wiring interconnection system practices
  • Wiring practice documents such as ESWPM
  • Standard practice for electrical installation using EWIS standards
  • Connecting devices
  • Inspection standards and proposed corrective actions based on manufacturers EWSPM standards
  • Review of the MRB Process and development of the Enhanced Zonal Analysis Procedure (EZAP)

Duration, Date and Location

Duration: 1 days
Location: Bern or Online

Suitable For

  • EASA Part-145 Maintenance Organisations personnel who performs aeroplanes maintenance or inspections on EWIS and/or systems or structures in close proximity to EWIS
  • EASA Part-CAMO Continuing Airworthiness Management Organisations
  • Quality Assurance and Competent Authority Members 


None, but previous attendance of the Fuel Tank Safety Course is beneficial.

Complication with EASA Regulation of

General Acceptable Means of Compliance for Airworthiness of Products, Parts and Appliances (AMC-20) ;

ED Decision 2008/007/R (AMC 20-22) Appendix A