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PPL Flight Planning & Performance Prep

Mass & balance, take-off/landing performance, planning the flight.

Pass mark 9/12 60 minutes UK CAA How many can I get wrong?
Weak on a topic? Drill just that one till it clicks, then move on.
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Q1. In mass and balance terminology, what is the 'datum'?
  • A.  The point where the centre of gravity must always lie
  • B.  The position of the aircraft's centre of lift
  • C.  The forward limit of the centre of gravity envelope
  • D.  A fixed reference point or line from which all arm measurements are taken
Show answer & explanation
✓ Answer: D. A fixed reference point or line from which all arm measurements are taken
The datum is an arbitrary fixed reference point, line or plane specified by the manufacturer from which all horizontal arm distances are measured. It is not itself a CG limit — the CG can lie ahead of, behind, or exactly at the datum depending on how it is defined.
Q2. ASDA (Accelerate-Stop Distance Available) is used to assess which scenario?
  • A.  Landing over a 50 ft obstacle with full flap selected
  • B.  Climbing to a safe height after an engine failure just after take-off
  • C.  A rejected take-off, where the aircraft must accelerate and then stop within the declared distance
  • D.  A go-around initiated during a wet-runway landing
Show answer & explanation
✓ Answer: C. A rejected take-off, where the aircraft must accelerate and then stop within the declared distance
ASDA (TORA plus stopway) is the distance available for accelerating to decision speed and then bringing the aircraft to a stop if take-off is abandoned. It has no bearing on landing or airborne climb performance.
Q3. For a given aircraft in steady cruise, if all other factors remain constant but aircraft weight is significantly reduced (e.g. by fuel burn during a long flight), the speed for best range will:
  • A.  Increase, because a lighter aircraft always needs more speed for efficiency
  • B.  Remain unchanged, since best range speed is independent of weight
  • C.  Decrease, because the speed for minimum drag reduces as weight reduces
  • D.  Become undefined, as range calculations assume constant weight
Show answer & explanation
✓ Answer: C. Decrease, because the speed for minimum drag reduces as weight reduces
The speed for minimum drag (and hence best range) varies with the square root of weight — as an aircraft burns off fuel and gets lighter, the optimum best-range speed decreases slightly. This is why some POH range/endurance procedures include a step-down cruise schedule for long flights.
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Mass & balance calculations · 35
Take-off & landing performance · 36
Cruise performance & range · 35
Fuel planning & reserves · 35
NOTAMs, AIP & planning documents · 38
Weight, density altitude & safety factors · 34
PPL Flight Planning & Performance Prep — common questions
Frequently asked
How many questions are in the PPL Flight Planning & Performance Prep?
The exam has 12 questions. Every Revision Robin mock uses the same 12-question format so your practice matches the real thing.
What is the pass mark for the PPL Flight Planning & Performance Prep?
You need 9 out of 12 correct to pass, which is about 75%. Our mocks mark you against this exact threshold.
How long do you get?
The test is timed at 60 minutes. Our full mock runs on the same clock so you can practise your pacing.
Are these the real exam questions?
No. Our questions are original and written to match the current syllabus, so they give realistic practice without copying the official paper. Every answer comes with a plain-English explanation. Always confirm current rules and content with UK CAA.