Part-66 Module 1
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Part-66 Module 1 (Mathematics) is one of the basic knowledge modules that make up the aircraft maintenance licence knowledge requirement under the European aviation maintenance licensing framework. It is aimed at candidates working toward, or maintaining, a Part-66 aircraft maintenance licence, and at training organisations building Part-147 basic courses around the module syllabus. The module covers the mathematical foundations used throughout aircraft maintenance: arithmetic, algebra, geometry and trigonometry, and the interpretation of graphs and simple statistical measures, applied to practical engineering calculations rather than pure theory. Because mathematics underpins later modules - physics, electrical and electronic fundamentals, and aerodynamics in particular - it is usually studied early and treated as a building block rather than an isolated subject. Preparation means working through the syllabus topic by topic, practising calculations by hand without a calculator where the examination requires it, and checking every formula and unit conversion until the method is automatic. Candidates should confirm the current syllabus, examination format, pass mark, duration and retake rules with their national competent authority or approved training organisation, as these administrative details are set outside the scope of this page. This page offers independent practice material only and is not affiliated with, endorsed by, or connected to any aviation authority or licensing body.
What you'll study
About Part-66 Module 1 preparation
What is Part-66 Module 1 about?
It is the mathematics module of the Part-66 basic knowledge syllabus. Expect arithmetic, fractions and decimals, percentages, algebra, geometry, trigonometry, graphs, and basic statistics, all presented in an engineering context so the techniques carry over into physics, electrical fundamentals and aerodynamics.
Who should take Module 1?
Candidates working toward a Part-66 aircraft maintenance licence, and students on a Part-147 basic training course that includes the module. It is also useful for anyone returning to study after a break who needs to rebuild calculation confidence before attempting the technical modules.
What is the exam format?
Questions are multiple choice. The number of questions, time allowed, pass mark and whether a calculator is permitted are set by the competent authority or training organisation delivering the examination, so confirm the current rules with them before exam day rather than relying on second-hand information.
How difficult is it?
Most candidates find the arithmetic and algebra manageable and the trigonometry and graph work harder. Difficulty usually comes from exam pressure and careless unit handling rather than from the concepts. Steady practice with worked calculations, done by hand, removes most of the difficulty.
Can I retake the exam if I fail?
Retake rules, waiting periods and any limits on the number of attempts are set by the authority or organisation that runs your examination. Ask them directly before you sit the paper so you know where you stand, and treat the first attempt as the one to prepare properly for.
What study order do you recommend?
Work in dependency order: arithmetic and fractions, then percentages and ratios, then algebra and transposition of formulas, then geometry, then trigonometry, then graphs and statistics. Each stage feeds the next, and weak algebra will make trigonometry and later physics modules far harder than they need to be.
What are the common failure modes?
Sign errors when transposing formulas, mixing units, rounding too early in multi-step calculations, misreading sine, cosine and tangent relationships, and running out of time on longer questions. Practising under timed conditions exposes all of these before the real paper does.
How long should I spend preparing?
That depends on your starting point. If your maths is rusty, allow several weeks of short, regular sessions rather than one long cram. Little and often beats marathon study for calculation skills, and revisiting earlier topics at intervals keeps the methods fresh.
Is this page an official source?
No. The material here is original independent practice content. It is not affiliated with, endorsed by or connected to any aviation authority, and it is not a substitute for the official syllabus, regulations or your training organisation's guidance.