032 ATPL subject guide
Performance
Performance combines formulas, charts, operational judgement, and disciplined reading.
- Subject code
- 032
- Difficulty
- Hard
- Key topics
- 3
Worked example questions
Independently authored revision questions in the same multiple-choice format as the exam. Try each one before opening the answer.
Worked example: the variable that lengthens the take-off run
Not quite. The correct answer is B.
Correct answer: B
- A. A lower pressure altitude means denser air, more available thrust and more lift for a given speed, and therefore a shorter distance, not a longer one.
- B. Correct. This removes a benefit and adds a penalty at the same time: throughout the ground roll, groundspeed at any given airspeed is now higher, and the take-off distance required increases.
- C. Lower temperature at the same pressure altitude reduces density altitude, giving denser air and better performance, so this shortens the distance required rather than lengthening it.
- D. A downhill slope adds a gravity component that assists acceleration, shortening the ground run. Replacing uphill with downhill helps the take-off, it does not hurt it.
Step by step
- Lower elevation and lower temperature both reduce density altitude, giving denser air, more available thrust and lift, and therefore a shorter distance, so options A and C both shorten the distance rather than lengthen it.
- A downhill slope assists acceleration compared with an uphill slope, so replacing uphill with downhill also shortens the distance, ruling out option D.
- Wind is the exception: swapping a headwind for an equal tailwind changes groundspeed in the wrong direction for the entire ground roll, and a tailwind always lengthens the take-off distance required.
- Only option B describes a change that lengthens the distance, both directly and by elimination of the other three.
Worked example: a turboprop dispatch landing distance
Not quite. The correct answer is D.
Correct answer: D
- A. This applies the turbojet 60 per cent factor (dividing by 0.6) to a turboprop, instead of the turboprop's own 70 per cent factor.
- B. This multiplies the actual landing distance by 0.7 instead of dividing by it, treating the 70 per cent rule as a reduction rather than as the fraction the actual distance must not exceed.
- C. This is the raw actual landing distance, with no dispatch factor applied at all. A demonstrated distance is never used as the dispatch minimum on its own.
- D. Correct. Required LDA = ALD / 0.7 = 1050 / 0.7 = 1500 m.
Step by step
- Identify the applicable factor: this is a turboprop, so the 70 per cent rule applies, meaning the actual landing distance must not exceed 70 per cent of the landing distance available.
- Rearrange for the required distance: required LDA = ALD / 0.7 = 1050 / 0.7 = 1500 m.
- The runway must offer at least 1500 m of landing distance available for this dispatch.
- Sanity check: 1500 m multiplied by 0.7 gives exactly 1050 m, the actual landing distance, confirming the factor was applied the right way round.
What this subject asks of you
Students often know the broad concept but still lose marks by misreading chart axes or applying the wrong correction factor.
What the paper tests
Chart reading and applied performance calculationsWhy it matters
This subject tests how limitations, atmospheric conditions, mass, and runway environment change the aircraft's ability to operate safely and legally.Best next step
Use timed practice and spaced recall together so weak areas come back before they decay.
Compare ATPL subject difficulty
Compare ATPL subject difficulty
Key topics
Take-off and landing distance corrections
Climb gradients, obstacle clearance, and balanced field concepts
Atmospheric effects such as temperature, pressure altitude, and runway condition
How to study it
- Practise chart reading slowly before trying to go fast.
- Keep a checklist of the variables you must scan before committing to an answer.
- Treat every performance problem as an operational scenario, not just a maths exercise.
Where Performance candidates lose marks
Common traps
- Reading the wrong chart family or missing an intermediate correction.
- Confusing climb performance with take-off or en-route limitations.
- Ignoring runway slope, surface, or wind adjustments hidden in the wording.
The hardest Performance exam areas
Where candidates actually lose marks in 032, and why.
Reading performance charts against several stacked corrections
Take-off and landing charts apply temperature, pressure altitude, wind, slope and mass corrections in a fixed sequence, and skipping one correction or applying two of them in the wrong order produces a number that still looks like a sensible answer.Telling gross climb gradients apart from net climb gradients
Certification minimums are demonstrated, gross figures, but obstacle clearance margins are built from a net gradient reduced by a fixed safety margin, and exam stems rarely say outright which one they mean, leaving candidates to infer it from context under time pressure.Applying wet and contaminated runway penalties in the right order
The aircraft-type dispatch factor and the wet or contaminated addition protect against two different things and must be applied in a fixed sequence, and reversing that sequence, or applying only one when the stem implies both, is one of the most repeated one-mark losses in this subject.
Frequently asked questions
Why is ATPL Performance difficult?
Why is ATPL Performance difficult?
What is the best way to revise Performance?
What is the best way to revise Performance?
Performance topic deep dives
Performance topic deep dives
Focused guides to the 032 topics students search for most, each with a fully worked example and the common mistakes.
Topic guide
V1 and the Balanced Field
How V1 is bounded by VMCG and VR, what balanced field length means, how weight, runway condition, clearway and stopway shift it, and a worked example.
Read the guideTopic guide
Take-Off Climb Segments and Gradients
The four take-off climb segments explained: what changes at each boundary, the twin-engine gradient minimums, and gross versus net.
Read the guideTopic guide
TORA, TODA, ASDA and LDA Explained
TORA, TODA, ASDA and LDA explained for the ATPL exam: what clearway and stopway add, which distance limits which certification case, and a worked example.
Read the guideTopic guide
Landing Distance and Dispatch Factors
Actual versus required landing distance for the ATPL exam: the turbojet and turboprop dispatch factors, the wet runway addition, and a worked example.
Read the guideFree tools for this subject
Free tools for this subject
Practise what Performance tests, free and without an account.
Free tool
Density Altitude Calculator
The number Performance charts actually respond to: build it from pressure altitude and OAT with the exam's 120 ft per °C rule, with the working shown.
Open the toolFree tool
Pressure Altitude Calculator
Every take-off and landing table is indexed by pressure altitude. Convert elevation and QNH the way the exam expects, and check your mental maths.
Open the toolFree tool
True Airspeed Calculator
See how temperature and altitude stretch CAS into TAS, the same density effect that drives climb and cruise performance.
Open the toolQuestion bank
Practice Performance questions
Exam-style 032 Performance questions with explanations, spaced repetition, and timed mock exams. Free to start.
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Read guideTurn Performance revision into actual practice.
The SkyStudy question bank turns Performance revision into practice.
Exam-style questions, mock exams, spaced repetition and progress tracking.
Subject knowledge becomes exam performance instead of passive reading.