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Practice / B1.1 / Module 9 / The ‘Dirty Dozen’ and risk mitigation: sub-module drill

Module 9 (B1.1): The ‘Dirty Dozen’ and risk mitigation: sub-module drill

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Career and licence

How to Become a Licensed Aircraft Engineer
Converting Between UK CAA and EASA Part-66 Licences
How to Apply for Your Part-66 Aircraft Maintenance Licence
How to Become a B1 Licensed Aircraft Engineer
Part-66 Experience Requirements (66.A.30) Explained
How Much Does a Part-66 Licence Cost?
Renewing Your Part-66 Licence
Self-Studying for Part-66: A Practical Plan
Part-66 Type Ratings and Aircraft Groups

Exam rules

EASA vs UK CAA Part-66: What Is Different in 2026
How to Book UK CAA Part-66 Module Exams
Part-66 Essay Questions: How They Are Marked and How to Pass
Part-66 Exam Format: Questions, Timing and the 75% Pass Mark
Part-66 Module Exams: How They Work in 2026
Part-66 Resit Rules: How Many Attempts and How Long to Wait

Licence categories

The Part-66 B1 Licence: Modules, Exams and Experience
B1 vs B2: Comparing the Part-66 Mechanical and Avionics Licences
The Part-66 B2 Avionics Licence Explained
The Part-66 B2L Licence and Its System Ratings
The Part-66 B3 Licence for Light Piston Aeroplanes
Part-66 Category A Licence (A1 to A4) Guide
Part-66 Licence Categories Explained

Module exams

Part-66 Module 1 Mathematics Questions and Practice Paper
Part-66 Module 10 Aviation Legislation Questions
Part-66 Module 11 Questions: Aeroplane Structures and Systems
Part-66 Module 12 Helicopter Questions and Practice Paper
Part-66 Module 13 Questions for B2 and B2L
Part-66 Module 14 Propulsion Questions (B2 and B2L)
Part-66 Module 15 Gas Turbine Engine Questions
Part-66 Module 16 Piston Engine Questions
Part-66 Module 17 Propeller Questions
Part-66 Module 2 Physics Questions and Practice Paper
Part-66 Module 3 Electrical Fundamentals Questions
Part-66 Module 4 Electronic Fundamentals Questions
Part-66 Module 5 Digital Techniques Questions
Part-66 Module 6 Materials and Hardware Questions
Part-66 Module 7 Maintenance Practices Questions and Papers
Part-66 Module 8 Basic Aerodynamics Questions
Part-66 Module 9 Human Factors Questions and Practice Paper
Part-66 Modules 1 to 17: The Complete Guide
Part-66 Past Papers, Question Banks and PDFs: The Honest Guide

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Part-66 Prep is an independent study aid. It is not affiliated with, endorsed by or approved by the European Union Aviation Safety Agency (EASA), the UK Civil Aviation Authority (CAA), any national aviation authority or any Part-147 approved maintenance training organisation. The app is not an approved Part-147 course, does not book examinations and does not issue certificates. The Part-66 syllabus and examination standard are published by EASA (Regulation (EU) No 1321/2014, Annex III) and by the UK CAA. © Bisai Technologies.