033 Flight Planning and Monitoring topic guide
The ICAO Flight Plan Form
The ICAO ATS flight plan is a fixed-format message, and the exam treats it that way: questions test what belongs in each item, which letter codes apply, and the conventions for speeds, levels, and times. It is pure precision work, and it is quick marks once the handful of examined items is solid.
The most tested distinctions are the four flight-rules letters, the difference between elapsed-time and clock-time entries, and the rule that the cruising speed is a true airspeed. Each of those has a dedicated distractor pattern that appears year after year.
The items the exam actually asks about
Item 8 carries the flight rules: I for IFR throughout, V for VFR throughout, Y when the flight departs IFR and later changes to VFR, and Z for the reverse. The memory hook is that the letter describes the first segment: Y starts IFR, Z starts VFR.
Item 15 carries the route, with the initial cruising speed as a TAS and the initial cruising level. Item 16 carries the destination and the total estimated elapsed time, which runs from take-off to arrival overhead the destination, not from off-blocks. Item 18 collects other information such as the date of flight or operator details, and Item 19, the supplementary data, records endurance in hours and minutes and persons on board, information that serves search and rescue rather than air traffic control.
Times follow one convention worth engraving: the estimated off-block time in Item 13 is a clock time in UTC, while Item 16 is an elapsed time. Mixing those two is the standard trap in any question that quotes both.
Changes, delays, and cancellation
A filed plan is not static. Delay and modification messages update it, and a flight plan for a flight that never departs must be cancelled. For the exam, remember that changes to key data for an IFR flight must be communicated as soon as practicable, and that the plan for a controlled flight feeds exactly the data ATC will use if communications fail: route, level, and estimated times. That link makes the flight plan and the radio-failure procedures two halves of the same story.
Worked example
Worked example: the flight rules letter
A flight departs under IFR, and the crew plans to cancel IFR en route and complete the flight under VFR. Which flight-rules letter belongs in Item 8 of the ICAO flight plan?
- AI
- BV
- CY
- DZ
Show the answer and walkthrough
Correct answer: C
- A. I means IFR for the whole flight. This flight ends VFR, so I understates the plan.
- B. V means VFR throughout. The departure is IFR, so V is wrong from the first minute.
- C. Correct: Y is filed when the flight is IFR first and changes to VFR. The letter follows the first segment of the flight.
- D. Z is the mirror image, VFR first changing to IFR later. Swapping Y and Z is the single most common error on this item.
Step by step
- Identify the sequence of flight rules: IFR at departure, VFR later.
- Match the sequence to the letter: the letter encodes the initial rules, with a change to follow. IFR first is Y, VFR first is Z.
- Cross-check by elimination: I and V claim a single rule throughout, which contradicts the stem.
Common mistakes
Swapping Y and Z
Both letters mean the rules change en route. Anchor on the first segment: Y begins IFR, Z begins VFR, and the stem always tells you how the flight departs.
Filing an indicated airspeed in Item 15
The cruising speed is a true airspeed (or a Mach number where required). Distractors quoting the IAS from the same stem rely on this exact confusion.
Reading total EET as an off-blocks time
Item 16 is elapsed time from take-off to overhead the destination. Options built from off-block clock times or block-to-block durations are testing the definition, not your arithmetic.
Related topic guides
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Last reviewed July 2026