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ATM · 12% of the exam

High-Altitude Aerodynamics practice questions

10 free High-Altitude Aerodynamics questions for the Airline Transport Pilot Multiengine (ATM) Knowledge Test exam, each with the correct answer and an explanation for every option.

Start the questionsFree 10-question ATM quiz

What this domain covers

How swept-wing jets behave at high altitude and high speed: compressibility, Mach effects, stability and the narrow margin between high- and low-speed limits.

Exam weight
12%
On a real exam
≈ 15 questions
In our bank
70 questions

Topics that come up most

  • Critical Mach number and Mach tuck
  • Coffin corner and buffet margins
  • Swept-wing stall characteristics
  • Dutch roll and yaw dampers
  • High-lift devices and their effect on lift

How to study it

Draw the high-altitude speed envelope yourself, marking low-speed buffet, high-speed buffet and maximum operating Mach, and explain how weight and altitude move each line.

Sample High-Altitude Aerodynamics questions

Try each one before opening the answer. Original questions written to the official exam objectives.

  1. Question 1

    What does specific range measure?

    • ADistance flown per unit of fuel
    • BFuel burned per hour only
    • CThe airplane's maximum altitude
    • DThe runway length needed
    Show answer and explanation

    Answer: A) Distance flown per unit of fuel

    • ACorrect. Higher specific range means better economy.
    • BIncorrect. That's fuel flow.
    • CIncorrect. That isn't specific range.
    • DIncorrect. That's a takeoff measure.

  2. Question 2

    What is the main aerodynamic purpose of the relatively flat upper surface of a supercritical airfoil?

    • ATo raise the maximum lift coefficient for lower approach speeds
    • BTo limit local flow acceleration, delaying and weakening the shock wave
    • CTo move the center of pressure forward and prevent Mach tuck
    • DTo increase induced drag and help the airplane slow down for descent
    Show answer and explanation

    Answer: B) To limit local flow acceleration, delaying and weakening the shock wave

    A supercritical airfoil's flat upper surface limits how much the local airflow speeds up. This delays and weakens the shock wave and pushes drag divergence to a higher Mach number.

    • AIncorrect. Supercritical sections are designed for high subsonic cruise, not low-speed lift. Jets get low-speed lift from high-lift devices such as flaps and slats.
    • BCorrect. The flatter upper surface keeps the local airflow from speeding up as much. Any shock that forms is weaker and further aft, so drag divergence moves to a higher Mach number and wave drag is lower.
    • CIncorrect. Mach tuck comes from the center of pressure moving aft as shocks form, and it is countered by Mach trim systems. The flat upper surface is not designed to move the center of pressure forward.
    • DIncorrect. Induced drag depends mainly on lift and wing planform/aspect ratio. The supercritical shape is meant to reduce wave drag, not to add drag.

  3. Question 3

    Total air temperature (TAT) is higher than static air temperature because of:

    • ARam rise
    • BEngine exhaust
    • CSun on the probe
    • DCabin heat leakage
    Show answer and explanation

    Answer: A) Ram rise

    • ACorrect. Compression heating at speed.
    • BIncorrect. It's ram rise.
    • CIncorrect. It's ram rise.
    • DIncorrect. It's ram rise.

  4. Question 4

    High-speed (Mach) buffet is caused by:

    • ALow angle of attack at slow speed
    • BIce on the leading edges
    • CShock-induced separation
    • DEngine vibration in cruise
    Show answer and explanation

    Answer: C) Shock-induced separation

    • AIncorrect. It's from shock waves.
    • BIncorrect. It's from shock waves.
    • CCorrect. Airflow separates behind shock waves.
    • DIncorrect. It's from shock waves.

  5. Question 5

    As fuel burns off during a long flight, a jet's optimum altitude:

    • ADrops below FL180
    • BDecreases
    • CStays the same
    • DIncreases
    Show answer and explanation

    Answer: D) Increases

    • AIncorrect. It rises as weight falls.
    • BIncorrect. It rises as weight falls.
    • CIncorrect. It rises as weight falls.
    • DCorrect. Hence step climbs.

  6. Question 6

    The crossover altitude is where:

    • ACabin pressure equals outside pressure
    • BVMO and MMO coincide
    • CThe jet stream is strongest
    • DTemperature stops decreasing
    Show answer and explanation

    Answer: B) VMO and MMO coincide

    • AIncorrect. It's where VMO and MMO coincide.
    • BCorrect. Above it, Mach limits apply.
    • CIncorrect. It's where VMO and MMO coincide.
    • DIncorrect. That's the tropopause.

  7. Question 7

    At what speed does a jet achieve maximum endurance?

    • AAt the maximum cruise speed for the altitude
    • BAt the speed for max L/D
    • CAt the stall speed
    • DAt VMO
    Show answer and explanation

    Answer: B) At the speed for max L/D

    • AIncorrect. That uses more fuel.
    • BCorrect. This minimizes fuel flow.
    • CIncorrect. That isn't efficient or safe.
    • DIncorrect. That uses far more fuel.

  8. Question 8

    Which statement correctly describes Mach tuck in a jet airplane flying above its critical Mach number?

    • AThe shock wave moves forward, shifting the center of pressure forward and pitching the nose up
    • BSpanwise flow stalls the swept wingtips, shifting the center of pressure forward and pitching the nose up
    • CThe shock wave moves aft, shifting the wing's center of pressure aft and pitching the nose down
    • DEngine thrust mounted below the center of gravity increases at high Mach, pitching the nose down
    Show answer and explanation

    Answer: C) The shock wave moves aft, shifting the wing's center of pressure aft and pitching the nose down

    Mach tuck happens when the shock wave moves aft with increasing speed and carries the wing's center of pressure with it, producing a nose-down tendency. Most high-Mach jets use automatic Mach trim or tuck compensation to counter it.

    • AIncorrect. As speed increases, the shock wave moves aft, not forward. Mach tuck is a nose-down tendency, not a nose-up one.
    • BIncorrect. This describes the swept-wing pitch-up that occurs at high angle of attack near the stall. It is not the high-Mach tuck tendency.
    • CCorrect. As speed increases and the shock wave moves aft, the wing's center of pressure moves aft, producing a nose-down tendency. If unchecked, it can exceed the available elevator authority.
    • DIncorrect. Mach tuck is an aerodynamic effect caused by the shock wave moving the wing's center of pressure aft. It is not caused by the thrust-line pitching moment.

  9. Question 9

    What is the time of useful consciousness at 40,000 feet?

    • AUnlimited, as long as the pilot stays calm and relaxed
    • BAbout 20 to 30 minutes, giving plenty of time to react
    • CAbout 3 to 5 minutes, enough time for a checklist
    • DAbout 15 to 20 seconds
    Show answer and explanation

    Answer: D) About 15 to 20 seconds

    • AIncorrect. It's seconds.
    • BIncorrect. It's far shorter.
    • CIncorrect. It's far shorter.
    • DCorrect. Masks must go on immediately.

  10. Question 10

    How does a jet's maximum range speed compare with its L/D max speed?

    • AIt's the same
    • BIt's slower
    • CIt's faster
    • DIt's always VMO
    Show answer and explanation

    Answer: C) It's faster

    • AIncorrect. Jets fly faster for range.
    • BIncorrect. It's faster.
    • CCorrect. Max range is about 1.32 times the L/D max speed.
    • DIncorrect. That's too fast.

High-Altitude Aerodynamics: FAQs

How much of the ATM exam is High-Altitude Aerodynamics?

High-Altitude Aerodynamics is 12% of the ATM exam by the official exam guide's weighting, which on a 125-question form works out to roughly 15 questions. The real exam's exact split varies by form.

What does the High-Altitude Aerodynamics domain cover?

How swept-wing jets behave at high altitude and high speed: compressibility, Mach effects, stability and the narrow margin between high- and low-speed limits.

How should I study High-Altitude Aerodynamics for ATM?

Draw the high-altitude speed envelope yourself, marking low-speed buffet, high-speed buffet and maximum operating Mach, and explain how weight and altitude move each line.

Where can I practise more High-Altitude Aerodynamics questions?

This page has 10 free High-Altitude Aerodynamics questions with answers. The ExamWize ATM question bank has 70 questions in this domain. Every practice exam result breaks your score down by domain, and Review Mode re-drills the questions you missed.

Other ATM topics

Also: 15 free questions across all topics, the ATM cheat sheet and the study guide.

Get High-Altitude Aerodynamics exam-ready

The full ATM bank has 70 High-Altitude Aerodynamics questions. Timed practice exams match the real exam's length and domain weights, every result shows your score per domain, and Review Mode re-drills the questions you missed.

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Not affiliated with FAA; questions are original, written from the official exam outline, and never copied from the real exam.