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Commercial Pilot Licence · Subject 22, AC61-5

NZ CPL Principles of Flight & Performance exam.

PoF and Performance is 45 questions in two hours, and it is the CPL exam where the formulas matter most: the lift equation, load factor in the turn, stall speed with bank, power required, glide range, and the performance charts for take-off, climb, cruise and landing. Our bank of 250 questions covers all 17 sub-topics of Subject 22 of AC61-5, with the working shown for every calculation.

45questions120minutes70%pass mark250in the bank
150syllabus items tested · the questions in the background are from the bank
Try three

Lift, power, and the glide.

Principles of Flight is formulas with a story attached. These three are the lift equation, power required and glide range; the de-brief below revises the trigonometry the performance questions lean on.

Answer each one and you see what the de-brief shows after a paid exam: the correct option, the reasoning and the syllabus item it came from.

0 of 3 answered

CPL · Syllabus 22.8.4Question 1 / 3

From the lift formula L = CL half rho V2 S, the effect on lift of increasing wing area by 20% at the same speed and angle of attack is that lift becomes:

Why

L = CL x half rho V2 x S: lift is proportional to the lift coefficient, to the air density, to the square of the true airspeed and to the wing area. Doubling V quadruples lift; halving rho at the same TAS halves lift, but at the same IAS the dynamic pressure (half rho V2) is unchanged so lift is unchanged; a 20% larger wing gives 20% more lift. Reference: syllabus 22.8.4; FAA-H-8083-25 Ch. 5.

Choose an answerSyllabus 22.8.4
CPL · Syllabus 22.18.8Question 2 / 3

In level flight at a TAS of 95 kt the total drag is 1500 N. The power required is approximately:

Why

Power required = drag x TAS = 1500 N x 48.9 m/s = 73302 W = 73 kW (98 hp). Because propeller efficiency is only about 80%, the engine must deliver roughly 92 kW of shaft power to provide it. Power required rises with the cube of speed at high speed because drag rises with speed squared and is multiplied by speed. Reference: syllabus 22.18.8; FAA-H-8083-25 Ch. 11.

Choose an answerSyllabus 22.18.8
CPL · Syllabus 22.20.14Question 3 / 3

An aircraft with a best glide ratio (L/D) of 11:1 suffers an engine failure at 4500 ft above the terrain. Its gliding range is:

Why

Glide ratio equals L/D, so the aircraft glides 11 ft forward for every 1 ft of height: 4500 x 11 = 49500 ft = 8.1 NM (1 NM = 6076 ft) in still air at the best glide speed. Reference: syllabus 22.20.14, 22.20.16; FAA-H-8083-25 Ch. 11.

Choose an answerSyllabus 22.20.14
The de-brief

The formula, and the physics under it.

The de-brief gives the formula, the numbers in it and the physical reason the answer moves the way it does, so the next question that changes a variable is one you have already met.

After a paid exam it is emailed to you as well, so it is still there the night before the real sitting.

The Flying Kiwi · Knowledge deficiency reportCPL PoF & Performance
Result
82%37 of 45 correct · pass mark 70%
What you missed

Q21  The trigonometric functions sine, cosine and tangent of an angle in a right-angled triangle are:

What you picked
Your answerSine, cosine and tangent are all equal to the angle expressed in radians
CorrectSine = opposite / hypotenuse; cosine = adjacent / hypotenuse; tangent = opposite / adjacent (= sine / cosine)
Why

Useful values: sin 30 = 0.5, cos 30 = 0.866, tan 30 = 0.577; sin 45 = cos 45 = 0.707, tan 45 = 1; sin 60 = 0.866, cos 60 = 0.5, tan 60 = 1.73. They appear throughout the subject: the load factor in a turn is 1/cos(bank), the wind…

Revise

Syllabus 22.2.12 · Principles of Flight & Performance · AC61-5

What the exam covers

Subject 22, seventeen sub-topics.

The theory half is here too: stability, control, propellers, asymmetric flight, range and endurance, and the atmosphere the aircraft flies in.

  • Aeroscience: the maths and physics the subject is built on
  • The atmosphere and the International Standard Atmosphere
  • Basic aerodynamic theory, lift and drag
  • Lift augmentation: flaps, slats and slots
  • Flight controls and control effectiveness
  • Stalling and spinning
  • Straight and level flight, climbing and descending
  • Turning: load factor, stall speed and radius
  • Propellers and propeller effects
  • Static and dynamic stability
  • Asymmetric flight and the critical engine
  • Range, endurance and performance charts
Watch for

Where the marks go in PoF and Performance.

  1. Load factor and stall speed in a level turn: n = 1 / cos(bank) and Vs multiplied by the square root of n.
  2. What doubles when speed doubles: lift and drag go with the square of speed, power required with the cube.
  3. Stability signs: what a forward or aft centre of gravity does to longitudinal static stability and to manoeuvrability.
  4. Glide range from height and lift-to-drag ratio, and why wind changes the range but not the best glide angle of attack.
Preparation

How to prepare for CPL Principles of Flight and Performance.

Half calculation, half explanation. The calculations reuse a small set of relationships; the explanations reward knowing why each one holds.

  1. Know what scales with what: lift and drag with the square of speed, power with the cube, stall speed with the square root of load factor.
  2. Turns: load factor from bank angle, stall speed from load factor, radius from speed. Three relationships cover a large slice of the exam.
  3. Stability is qualitative and asked precisely: static versus dynamic, the effect of centre of gravity position, what each surface contributes. Write it as a table.
  4. Performance charts: practise with the conditions given, and always check whether the question wants a distance, a time or a fuel figure.
PoF & Performance questions

Questions about this exam.

If yours is not here, email support.

Our exam is 45 questions in 120 minutes, matched to the Aspeq CPL Principles of Flight and Performance sitting. Pass mark 70%.

Performance is half the subject. Our chart-style questions state the chart values in the stem so they can be worked without the chart in front of you, and the de-brief shows each step.

No. PPL Tech touches aerodynamics briefly; CPL Subject 22 is the full principles of flight and performance syllabus, with calculations throughout.

How it works

Sit CPL PoF & Performance here, timed like the real exam.

Forty-five questions in two hours, half of them calculations. Sit it here to find out which formulas you know and which you merely recognise.

01Buy a code

Checkout takes a minute on Stripe and the code is emailed instantly. A single works on any CPL subject; bundles arrive as a set with codes for every subject.

02Sit the exam

45 questions on a 120-minute clock, drawn fresh from the PoF & Performance bank. Bookmark, skip, come back, submit when you are done. Progress survives a dropped connection.

03Read the de-brief

Score and pass or fail on screen straight away, then the full de-brief by email: every question you got wrong, what you chose, the correct answer, the reasoning and the syllabus reference to revise.

Before the real one

Sit CPL PoF & Performance here first. Then sit it for real.

Forty-five questions, two hours, every formula worked in the de-brief, for $9.99. Recognising a formula and being able to use it under the clock are different things, and only one of them passes.

  • The same format as the Aspeq sitting: 45 questions, 120 minutes, 70% to pass.
  • Drawn fresh from 250 PoF & Performance questions each time, options shuffled. Never the same exam twice.
  • Every wrong answer explained, with the syllabus reference to revise, on screen and by email.
  • Code emailed instantly. Sit it tonight or in three months; unused codes never expire.

45 questions · 120 minutes · 70% to pass

$9.99CPL PoF & Performance examNZD · one full-length exam · Other NZ practice exams typically charge about $12.00

Or a set for every subject: Starter 6 codes $49.99, Plus 12 codes $89.99, Complete 18 codes $119.99.

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CPL PoF & Performance exam45 questions · 120 min · $9.99Sit it now