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EASA Part-66 Module 1 Cats A · B1 · B2 · B2L · B3

Mathematics EASA Part-66 — Module 1 Practice Questions

Aircraft maintenance licence candidates all sit a Module 1 exam covering arithmetic, algebra, geometry & trigonometry — without a calculator. Below: what's covered, exam format, and seven free sample questions in the same style you'll meet on exam day.

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Every question comes with a worked, EASA-grounded explanation — understand why, don't just memorise.

1 062

Questions in bank

3

Syllabus sections

40 min

Exam time (B1/B2)

75 %

EASA pass mark

Syllabus at a glance

Full Module 1 syllabus

Section 1.1

Arithmetic

Fractions, decimals, ratios & percentages
Weights, measures & unit conversion
Areas, volumes, squares, cubes & roots

Section 1.2

Algebra

Simple expressions & bracket use
Linear & simultaneous equations (B1/B2/B2L/B3)
Indices, binary & hexadecimal numbering

Section 1.3

Geometry

Simple geometrical constructions
Graphical representation & charts
Trigonometry & SOH-CAH-TOA (B1+)

Three classic exam-day traps

Unit conversion: cm² ↔ m²

Candidates instinctively divide by 100 because that works for length, but area needs ÷10 000 and volume ÷1 000 000.

Diameter vs radius

Cylinder & sphere formulas use radius (½ × diameter). Plug diameter straight in and the answer quadruples or eight-folds.

SOH-CAH-TOA mix-up

Under time pressure, cosine (adj/hyp) gets swapped with tangent (opp/adj). Mnemonic on paper before you start.

What Module 1 covers — in plain English

Module 1 of the EASA Part-66 syllabus tests the mathematical fundamentals every licensed aircraft maintenance engineer relies on day-to-day: reading drawings, sizing components, working with units of measurement, and interpreting graphical data on test equipment. It is one of the shortest modules in the syllabus but one of the highest-failed at first attempt — almost entirely because the exam is sat without a calculator and many candidates underestimate how rusty their long-division and unit-conversion arithmetic has become.

Category A candidates need only knowledge level 1 in some sections and skip the algebraic equations, constructions and trigonometry entirely. B1, B2, B2L and B3 candidates all sit the same 32-question paper at knowledge level 2 — you need to understand the principles and be able to apply them, not just recognise them. The full per-section breakdown is on our Module 1 syllabus page.

These samples are drawn from our live Module 1 question bank of 1 062 questions. The full timed practice quiz draws 32 questions per attempt (or 16 for Cat A), scored against the official EASA 75 % pass mark, with weak-area tracking across attempts.

7 free sample questions

Click "Reveal answer + explanation" after you've picked.

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Q1 Arithmetic

Express the fraction 7/8 as a decimal.

A 0.785
B 0.875
C 0.878

Reveal answer + explanation Hide answer

Correct answer: B — 0.875

Divide 7 by 8: 7 ÷ 8 = 0.875. A common trap is misplacing the decimal — always cross-check by multiplying the result back (0.875 × 8 = 7).

Q2 Arithmetic

A blueprint shows a hole of 0.3751" to be drilled. What fraction size drill bit is most nearly equal?

A 3/16
B 5/16
C 3/8

Reveal answer + explanation Hide answer

Correct answer: C — 3/8

3/8 = 0.375 — exactly the blueprint value (rounded). 5/16 = 0.3125 and 3/16 = 0.1875. Decimal-to-fraction conversion is heavily tested in Module 1 because aircraft drawings often mix units.

Q3 Algebra

Solve the following equation: 5x = 3x + 2.

A x = 1
B x = 3
C x = 5

Reveal answer + explanation Hide answer

Correct answer: A — x = 1

Subtract 3x from both sides → 2x = 2 → x = 1. Linear-equation questions like this carry knowledge level 2 for B1/B2/B2L/B3 candidates.

Q4 Algebra · Coordinate Geometry

What is the equation of a straight line with gradient m and intercept on the y-axis c?

A y = mx + c
B x = y + mc
C y = cx + m

Reveal answer + explanation Hide answer

Correct answer: A — y = mx + c

Slope-intercept form: y = mx + c (UK convention) or y = mx + b (US). The gradient m is the rise over run; c is where the line crosses the y-axis.

Q5 Geometry · Areas

What is the area of a rectangle when its height is 11 cm and the width is 120 cm?

A 0.132 m²
B 1.32 m²
C 1320 m²

Reveal answer + explanation Hide answer

Correct answer: A — 0.132 m²

Area = 11 × 120 = 1320 cm². To convert to m², divide by 10,000 (because 1 m² = 100 cm × 100 cm). 1320 ÷ 10,000 = 0.132 m². Unit conversion between cm² and m² is one of the most-missed traps in this module.

Q6 Geometry · Volumes

The diameter of a cylinder is 200 cm and the height is 20 cm. What is the volume?

A 8000 cm³
B 62 800 cm³
C 628 000 cm³

Reveal answer + explanation Hide answer

Correct answer: C — 628 000 cm³

Volume of a cylinder = π × r² × h. Radius is half the diameter (100 cm). π × 100² × 20 ≈ 628 318 cm³, which rounds to 628 000 cm³. Watch for the diameter-vs-radius trap — using 200 instead of 100 quadruples the answer.

Q7 Geometry · Trigonometry

Using cosine to find the angle of a triangle, which statement is true?

A Opposite / Hypotenuse
B Opposite / Adjacent
C Adjacent / Hypotenuse

Reveal answer + explanation Hide answer

Correct answer: C — Adjacent / Hypotenuse

SOH-CAH-TOA: Sine = Opposite/Hypotenuse, Cosine = Adjacent/Hypotenuse, Tangent = Opposite/Adjacent. Trigonometry is examinable for B1/B2/B2L/B3 candidates (knowledge level 2) but not for category A.

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Ready for the full Module 1 timed practice quiz?

Sign up, pick Module 1 from the dashboard, and take a timed exam drawn from our 1 062-question bank — the number of questions follows your licence category (16 for Cat A, 32 for B1/B2/B2L/B3). Your score is tracked across attempts and we surface your weakest sub-topics so revision time pays off.

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Module 1 — frequently asked questions

How many questions are in the EASA Part-66 Module 1 exam?

Category A candidates sit 16 multiple-choice questions, while Category B1 (and B2/B2L/B3) candidates sit 32. So the paper is twice as long for B-category candidates, reflecting the deeper knowledge level required in algebra, geometry and trigonometry. All questions are multiple-choice with a single correct answer.

What is the pass mark for EASA Part-66 Module 1?

The pass mark is 75%, the same for every EASA Part-66 module. You must answer at least 12 of the 16 questions (Category A) or 24 of the 32 (Category B1) correctly. There is no negative marking, so it is always worth attempting every question rather than leaving a blank.

How long is the Module 1 exam?

Category A candidates get 20 minutes for their 16 questions, and Category B1 (B2/B2L/B3) candidates get 40 minutes for 32. That works out to roughly 75 seconds per question in both cases. Because Module 1 is sat without a calculator, that time budget is tighter than it looks — practising mental arithmetic and long division beforehand is essential.

Which EASA licence categories require Module 1?

Module 1 (Mathematics) is required for all licence categories: Cats A, B1, B2, B2L and B3. Category A candidates take a reduced-depth version and skip the algebraic equations, geometrical constructions and trigonometry, while B1, B2, B2L and B3 candidates sit the full 32-question paper at knowledge level 2. You can see the per-section breakdown on our Module 1 syllabus page.

What does Module 1 cover, and what do students find hardest?

Module 1 covers three areas: Arithmetic (fractions, decimals, ratios, percentages, unit conversion, areas, volumes, squares, cubes and roots), Algebra (simple expressions, linear and simultaneous equations, indices, binary and hexadecimal numbering) and Geometry (geometrical constructions, graphs and charts, and trigonometry using SOH-CAH-TOA). The most-missed traps are area and volume unit conversion — candidates divide by 100 as they would for length, but area needs ÷10,000 (cm² to m²) and volume ÷1,000,000. Two other classic slips are plugging diameter straight into cylinder and sphere formulas instead of the radius (half the diameter), and swapping cosine (adjacent/hypotenuse) with tangent under time pressure.

How should I revise for Module 1?

Because the exam is sat without a calculator, the single biggest cause of first-attempt failures is rusty long division and unit-conversion arithmetic — so practise those by hand rather than relying on mental estimation. Drill the specific traps: convert cm² to m² by dividing by 10,000 (and cm³ to m³ by 1,000,000), always halve the diameter to get the radius before using a circle, cylinder or sphere formula, and write SOH-CAH-TOA on your paper before you start the trigonometry questions. Working through timed practice questions in the same style as the exam builds both speed and confidence for the roughly 75-seconds-per-question pace.

Other EASA Part-66 modules

3. Electrical fundamentals

4. Electronic fundamentals

5. Digital techniques / Electronic instrument systems

6. Materials & hardware

7. Maintenance practices

8. Basic aerodynamics

9. Human factors

10. Aviation legislation

11. Aeroplane aerodynamics, structures and systems

12. Helicopter aerodynamics, structures and systems

13. Aircraft aerodynamics, structures and systems

15. Gas turbine engine

16. Piston engine

Module 1 study resources

Module 1 detailed syllabus

Per Commission Regulation (EU) 2023/989

Module 1 study notes

Topic-by-topic explanations

Ask about tricky Module 1 questions

EASA licence categories

A · B1 · B2 · B2L · B3 overview

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