---
title: "MODULE 4. ELECTRONIC FUNDAMENTALS — Part-66 · Avioverse"
description: "MODULE 4. ELECTRONICS FUNDAMENTALS LEVEL A B1 B3 B2 B2L 4.1 Semiconductors 4.1.1 Diodes (a) Description and characteristics;"
url: "https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-4-electronic-fundamentals"
---

# MODULE 4. ELECTRONIC FUNDAMENTALS

Annex III (Part-66) · Regulation (EU) No 1321/2014 · EAR revision 2 Sep 2025

IR Implementing rule

## MODULE 4. ELECTRONIC FUNDAMENTALS

| MODULE 4. ELECTRONICS FUNDAMENTALS |                                       | LEVEL |       |        |
| ---------------------------------- | ------------------------------------- | ----- | ----- | ------ |
|                                    |                                       | A     | B1 B3 | B2 B2L |
| 4.1 Semiconductors                 |                                       |       |       |        |
| 4.1.1 Diodes                       |                                       |       |       |        |
|                                    | (a) Description and characteristics;  | —     | 2     | 2      |
|                                    | (b) Operation and function.           | —     | —     | 2      |
| 4.1.2 Transistors                  |                                       |       |       |        |
|                                    | (a) Description and characteristics;  | —     | 1     | 2      |
|                                    | (b) Filters.                          | —     | —     | 2      |
| 4.1.3 Integrated circuits          |                                       |       |       |        |
|                                    | (a) Basic description and operation;  | —     | 1     | 2      |
|                                    | (b) Description and operation.        | —     | —     | 2      |
| 4.2 Printed circuit boards         |                                       | —     | 1     | 2      |
| 4.3 Servomechanisms                |                                       |       |       |        |
|                                    | (a) Principles;                       | —     | 1     | 2      |
|                                    | (b) Construction, operation, and use. | —     | —     | 2      |

IR — Regulation (EU) No 1321/2014 · Regulation (EU) 2023/989 · Continuing Airworthiness Easy Access Rules · EAR revision 2 Sep 2025

[All rules in APPENDICES TO ANNEX III (Part-66)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66)

Consolidated from the EASA Easy Access Rules (revision 2 Sep 2025, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.