UK CAA Part-66 Module 5 Digital Techniques/Electronic Instrument Systems — B1.1 — Information & Free Practice
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Exam Review
About UK CAA Part-66 Module 5 Digital Techniques/Electronic Instrument Systems — B1.1
UK CAA Part-66 Module 5 Digital Techniques/Electronic Instrument Systems — B1.1 · GB
Key exam facts
- Provider
- UK Civil Aviation Authority (CAA) sets the UK Part-66 standard. Examinations are conducted by the CAA or an appropriately approved UK Part-147 maintenance training organisation.
- Format
- Knowledge examination: multiple-choice questions, each with three alternatives and one correct answer; no essay for full Module 5 B1.1. CAA delivery uses the invigilated e-Exam service.
- Exam questions
- Total questions: 40.
- Time limit
- 50 minutes of examination time. CAA candidates must arrive at least 30 minutes before the scheduled examination; arrival time is additional.
- Passing score
- 75% for the module multiple-choice examination; penalty marking is not used.
- Exam fee
- GBP £60 for each attempt at a written module or part-module examination conducted by the CAA, under ORS5 No 446 effective 1 April 2026. This is the CAA delivery fee, not a uniform fee for separately priced Part-147 providers.
Topics covered
Electronic Instrument Systems
Numbering Systems
Data Conversion
Data Buses
Logic Circuits
- Identification of common logic gate symbols, tables and equivalent circuits; applications used for aircraft systems, schematic diagrams
Basic Computer Structure
- Computer terminology; computer technology as applied in aircraft systems
Fibre Optics
Electronic Displays
Electrostatic Sensitive Devices
Software Management Control
Electromagnetic Environment
Typical Electronic/Digital Aircraft Systems
How to prepare
Work through the topics, read the explanation after each answer, and revisit the areas where you miss questions. Use the official outline and reference materials below to guide your study.
These independent practice questions are not actual exam items and do not guarantee a passing result.
Frequently asked questions
What is the exam format?
Knowledge examination: multiple-choice questions, each with three alternatives and one correct answer; no essay for full Module 5 B1.1. CAA delivery uses the invigilated e-Exam service.
How many questions are on the exam?
Total questions: 40.
How long is the exam?
50 minutes of examination time. CAA candidates must arrive at least 30 minutes before the scheduled examination; arrival time is additional.
What is the passing score?
75% for the module multiple-choice examination; penalty marking is not used.
How much does the exam cost?
GBP £60 for each attempt at a written module or part-module examination conducted by the CAA, under ORS5 No 446 effective 1 April 2026. This is the CAA delivery fee, not a uniform fee for separately priced Part-147 providers.
Official sources and references
- UK Part-66 Appendix I
Module 5; B1.1/B1.3 column
- UK Part-66 Appendix II
2.5 Module 5
- UK Part-66 Appendix II
1.7
- CAA Scheme of Charges Personnel Licensing
12.1 Table 60(f), p. 42
- CAA Continuing Airworthiness
p. 630, 66.A.25(a)
Confirm current exam arrangements with the exam provider.