Mass & Balance: 5 Latest ATPL Questions Explained | Loading 

Mass and Balance (M&B) often appears straightforward, yet the ATPL exam is famous for its conceptual traps. Success hinges on two things: mastering how various mass definitions interact and perfecting Centre of Gravity (CG) calculations — the foundation of flight safety. Explore key subtopics & core concepts of the Mass and Balance Syllabus. 

Don't let the exam's format fool you. While it is one of the shorter sittings (25 questions in 75 minutes), the time pressure is real. Speed and accuracy only come with consistent practice. Without it, even well-prepared students can find themselves racing the clock.

To help you sharpen your skills, we’ve analysed five questions featured in actual EASA exams over the past month. Each is broken down below with step-by-step logic, practical reasoning, and professional exam tips to ensure you're ready for the real thing.

Prefer video learning? A full video version of this walkthrough is available on the AirheadATPL YouTube channel, where we publish regular ATPL questions walkthrough videos covering all 13 ATPL subjects.

In addition, the Airhead team — together with ATPL pilot Michal — runs free live revision sessions designed to help you practise the latest questions shortly before your exam. Join us weekly to sharpen your understanding, avoid common traps, and approach your ATPL exams with greater speed and confidence. 

Recent ATPL Mass & Balance Exam Questions (March, 2026 Update)

The blog concentrates on Topic 03102 – Loading, targeting common exam traps in mass definitions, fuel calculations, performance-limited mass, and operational loading limits. These are areas where small misunderstandings can cost easy marks.

Questions & Topics Covered

1. AIR-240887: Performance-Limited Take-Off Mass (PLTOM) — Correct Definition

2. AIR-241122: Fuel Calculation — Total Mass Limit and Available Fuel Load

3. AIR-240942: Maximum Mass Before Engine Start — Correct Operational Definition

4. AIR-241088: Fuel Volume Conversion — Specific Gravity and US Gallons Calculation

5. AIR-241038: Maximum Take-Off Mass (MTOM) — Regulatory Definition

Question 1: Performance-Limited Take-Off Mass

Question ID AIR-240887: The Performance-Limited Take-Off Mass (PLTOM) is defined as the…

1. take-off mass subject to departure aerodrome limitations.

2. maximum permissible total aeroplane mass at the start of the take-off run.

3. maximum permissible mass of an aeroplane, but excluding fuel.

4. mass subject to the landing aerodrome limitations.

Correct Answer: The maximum permissible total aeroplane mass at the start of the take-off run.

Explanation: When determining the allowable take-off mass, two important limits must be considered:

• Maximum Take-Off Mass (MTOM) – the structural limit of the aircraft

• Performance-Limited Take-Off Mass (PLTOM) – the limit imposed by operational performance conditions

The regulated take-off mass is always the lower of these two values.

The PLTOM itself is determined by several performance factors:

1. Field-limited take-off mass. Determined by the available runway length and accelerate-stop / accelerate-go requirements.

2. Obstacle-limited take-off mass. Determined by the aircraft’s ability to clear obstacles during the initial climb after take-off.

3. Climb-limited take-off mass. Determined by the aircraft’s climb performance in later climb segments, for example, when terrain or mountains must be cleared further from the aerodrome.

All of these limitations are calculated according to procedures and limits specified in the Aircraft Flight Manual (AFM).

The lowest mass allowed by these performance constraints becomes the Performance-Limited Take-Off Mass.

Exam Tip: Remember the hierarchy:

Regulated Take-Off Mass = Lower of:

• MTOM (structural limit)

• PLTOM (performance limit)

Question 2: Dry Operating Mass Calculation

Question ID AIR-241122: The total mass limit of a light twin is equal to 3200 lb. The pilot weighs 200 lb, and the combined mass of the passengers and their baggage is 850 lb. Assuming a Dry Operating Mass of 1742 lb, how much fuel can be loaded?

1. 367 kg

2. 608 kg

3. 276 kg

4. 311 kg

Correct Answer: 276 kg of fuel

Explanation: The key to solving this question is understanding Dry Operating Mass (DOM).

DOM includes:

• Basic Empty Mass of the aircraft

• Crew (including the pilot)

• Operational equipment

• Catering, water, and other variable operational items

Because the pilot’s mass is already included in the DOM, it must not be added again in the calculation.

Step-by-step calculation:

Maximum allowable mass: 3200 lb

Current mass:

• Dry Operating Mass = 1742 lb

• Passengers + baggage = 850 lb

Total mass before fuel: 1742 + 850 = 2592 lb

Remaining allowable mass for fuel: 3200 − 2592 = 608 lb

Converted to kilograms: 608 ÷ 2.2 ≈ 276 kg

Exam Tip: In mass-calculation questions, DOM already includes the crew.

Question 3:  Maximum Ramp Mass

Question ID AIR-240942: The maximum mass to which an aeroplane may be loaded, prior to engine start, is:

1. maximum regulated taxi -ramp- mass.

2. maximum certificated take-off mass.

3. maximum regulated take-off mass.

4. maximum certificated taxi -ramp- mass.

Correct Answer: The Maximum Ramp Mass (Maximum Taxi / Ramp Mass).

Explanation: Aircraft mass limits differ depending on the phase of ground operation. This is why several similar-sounding limits exist.

The Maximum Ramp Mass (also called Maximum Taxi Mass) is the maximum mass at which the aircraft may be loaded while stationary on the ramp before engine start.

This limit is usually slightly higher than the Maximum Take-Off Mass because some fuel will be burned before take-off.

Typical sequence of mass limits:

1. Ramp Mass – maximum mass while parked at the gate

2. Taxi Mass – mass during taxi

3. Take-Off Mass – mass at the start of the take-off run

Fuel may be consumed during: APU operation while waiting for passengers, long ground delays, and taxi to the runway.

Because of this expected fuel burn, the aircraft may initially be loaded above MTOM, provided the mass decreases to within limits before take-off. All of these limits are specified in the aircraft’s AFM and must always be respected.

Exam Tip: Remember the sequence:

Ramp Mass → Taxi Mass → Take-Off Mass

Ramp mass is usually slightly higher than MTOM because of taxi fuel burn.

Question 4: Fuel Conversion Using Specific Gravity

Question ID AIR-241088: You have just finished planning a flight, and you require 3643 lb of fuel. The fuel tanker supplies fuel in US gallons with a specific gravity of 0.84. How many US gallons do you require?

1. 520

2. 367

3. 437

4. 1146

Correct Answer: Approximately 520 US gallons

Explanation: This question tests mass-to-volume fuel conversion using specific gravity.

Step 1 — Convert pounds to kilograms: 

3643 lb ÷ 2.2 ≈ 1656 kg

Step 2 — Convert mass to volume using specific gravity (SG): Volume (litres) = Mass ÷ SG

1656 ÷ 0.84 ≈ 1971 litres

Step 3 — Convert litres to US gallons:

1 US gallon = 3.785 L

1971 ÷ 3.785 ≈ 520 US gallons

Alternative Exam Method: This conversion can also be done quickly using an, which allows rapid conversion between kilograms, pounds, litres, US gallons, and imperial gallons. This can save valuable time during the exam.

Exam Tip: Remember the workflow:  Mass → kg → divide by SG → litres → convert to gallons

Question 5: Maximum Take-Off Mass

Question ID AIR-241038: The Maximum Take-Off Mass of an aeroplane is…

1. ​​a take-off-limited mass which is variable according to the runway strength of the departure aerodrome.

2. the maximum permissible mass of a loaded aeroplane before leaving the parking stand.

3. the maximum permissible total aeroplane mass at the start of the take-off run.

4. a performance-limited take-off mass which is affected by atmospheric pressure and temperature.

Correct Answer: the maximum permissible total aeroplane mass at the start of the take-off run.

Explanation: The Maximum Take-Off Mass (MTOM) is a structural limitation determined by the aircraft manufacturer. It represents the highest mass the aircraft structure can safely withstand during the stresses of take-off.

During flight planning, however, the aircraft may also be limited by performance considerations, such as:

• Runway length

• Climb performance

• Obstacle clearance

• Environmental conditions

These limitations determine the Performance-Limited Take-Off Mass (PLTOM).

The regulated take-off mass is therefore always the lower of the two values: MTOM (structural limit) and PLTOM (performance limit).

Even if performance would allow a higher mass, the aircraft must never exceed MTOM, as this is the structural design limit of the aircraft.

Exam Tip: Always separate the two concepts:

MTOM = structural limit. PLTOM = performance limit.

The regulated take-off mass = the lower value.

ATPL Mass & Balance Exam Overview

At the end of this walkthrough, you’ll find a concise overview of the ATPL Mass & Balance exam. It provides a clear snapshot of what to expect — including the exam structure, timing, difficulty level, and key focus areas — so you can prepare efficiently and with confidence.

Difficulty: Medium (although time pressure can be challenging) Number of Questions: 25 Exam Duration: 1 hour 15 minutes 83% of papers passed

Mass & Balance is one of the most practical and directly applicable subjects in the ATPL syllabus. Every time we fly — regardless of the aircraft type — we must ensure the aircraft is loaded correctly. In simple terms, the total mass (often used interchangeably with weight in this subject) must remain within the aircraft’s limits and be distributed correctly.

Although we may not always think about it explicitly, an aircraft effectively flies around its centre of gravity. For the aircraft to remain controllable and stable, the centre of gravity must be positioned specifically within the allowable range between the forward and aft limits.

The exam requires some basic mathematical ability, which can make it intimidating for students who are less comfortable with calculations. However, the underlying concepts and formulae are relatively straightforward. With sufficient question practice, it becomes a subject where most students perform well.

Practising questions with the question bank is essential for the Mass & Balance exam. During the test, you simply won’t have time to analyse each problem from first principles. Instead, you should aim to recognise the question type immediately, identify the correct method or formula, spot potential traps, and apply the calculation quickly. In most cases, the question will simply be a variation of a problem you have already seen many times during your preparation.

Because some calculations can be complex, accuracy is critical. Taking a moment to check your work and final answer for simple mistakes is never time wasted. Developing an intuitive sense that an answer “looks about right” is an important skill — both for the exam and for real-world operations.

Practise Mass and Balance questions with Airhead ATPL Question Bank.