You're not bad at math. You're bad at reading the question.
Most people set a surface-level goal for Flight Planning: "I'll memorize the formulas." They hype themselves up with practice problems, then go back to their old ways when the real exam hits.
Why?
Because they were trying to solve complex EASA ATPL problems on a foundation of misunderstood terminology.
Do not take this next sentence lightly.
In Flight Planning, the most common errors aren't calculation errors. They are interpretation errors rooted in ignoring EASA-specific conditionals.
You say you understand the syllabus. But your exam scores show otherwise.
And it goes a lot deeper than you think.
Here are the 7 specific mistakes students make in EASA ATPL Flight Planning, and the exact principles you need to fix them.
1. The Mistake: Ignoring "Except" and "Unless" in Conditionals
The Error: You read "Calculate fuel for a flight unless the wind is above 30 knots" and you calculate fuel for
all conditions, ignoring the exception.
The Correct Principle: EASA ATPL questions are built on conditionals. The word "except," "not," or "unless" reverses the entire logic of the question.
EASA Terminology: Conditional Fuel Requirement. You must identify the condition that triggers the exception before applying the formula.
2. The Mistake: Using Standard Pressure Instead of QNH for Landing
The Error: You calculate landing fuel using 1013.25 hPa (Standard Pressure) when the question specifies the local QNH is 1020 hPa.
The Correct Principle: Landing calculations must use the actual local pressure to determine the correct altitude and density for the landing environment.
EASA Terminology: QNH Correction and
Pressure Altitude. Never use 1013.25 hPa unless explicitly told the airport is at standard pressure.
3. The Mistake: Confusing "Fuel Required" with "Fuel On Board"
The Error: You calculate the fuel needed to complete the trip (Fuel Required) and answer that as the total Fuel On Board (FOB), missing the reserve requirement.
The Correct Principle: FOB = Fuel Required + Reserves. The exam asks for the total load, not just the trip burn.
EASA Terminology: Minimum Take-off Fuel vs.
Actual Take-off Fuel. Always add the mandatory reserves (Contingency, Alternate, Final Reserve) to the trip fuel.
4. The Mistake: Neglecting the Contingency Fuel Percentage
The Error: You calculate trip fuel and ignore the 5% (or 3%) contingency fuel required by EASA regulations for unforeseen route deviations.
The Correct Principle: EASA Part-FCL mandates a contingency buffer. It is not optional. It is a fixed percentage of the trip fuel.
EASA Terminology: Contingency Fuel (typically 5% of trip fuel for non-ETOPS). Never calculate trip fuel without adding this buffer.
5. The Mistake: Using METO (Maximum Endurance) Instead of MRC (Minimum Range)
The Error: The question asks for the most efficient cruise for a long flight, and you select the speed for maximum endurance (METO) instead of minimum range (MRC).
The Correct Principle: For long-distance planning, you need the speed that gives the best distance per unit of fuel (MRC), not the speed for longest time in the air (METO).
EASA Terminology: Minimum Range Cruise (MRC) vs.
Maximum Endurance (METO). MRC is for fuel efficiency over distance; METO is for time.
6. The Mistake: Calculating Without Temperature Correction
The Error: You use the standard temperature for the altitude in the chart, even though the question gives an actual temperature that is +15°C warmer.
The Correct Principle: Temperature affects density and true air speed. A warmer temperature means lower density and higher true air speed for the same indicated speed.
EASA Terminology: Temperature Deviation and
Density Altitude. Always adjust your performance chart input for the actual temperature.
7. The Mistake: Changing Your Answer Without a Reason
The Error: You pick an answer, then circle back and change it to a "better looking" option because you feel unsure, even though you have no proof the first was wrong.
The Correct Principle: Your first instinct on a multiple-choice question is statistically more likely to be correct. Changing answers without a specific, logical reason is a trap.
EASA Terminology: First Instinct Bias. Only change an answer if you identify a specific reason why your first choice was wrong.
Most people get this wrong because they memorize steps instead of understanding the logic.
You need to stop guessing.
You need to start reading the question fully.
And you need to master the EASA terminology.
FAQ
Ready to master Flight Planning?
Don't let terminology errors cost you your license.
Get the latest EASA ATPL 2026 study guides and timed mock exams at
atpltraining.io.
Stop guessing. Start passing.
Photo by Oskar Kadaksoo on Unsplash
