Avielevate / DGCA CPL papers / Air Navigation / In Flight Navigation
In Flight Navigation — DGCA CPL Air Navigation
Chapter GN13 of the Air Navigation paper. 43 practice questions in the Avielevate bank, every one with its answer key, filterable into a timed set on this chapter alone.
What this chapter covers
The learning objectives we file In Flight Navigation questions under, and how many sit behind each. These come straight out of the bank and are regenerated whenever it changes — they are what is there today, not a claim.
| Learning objective | In the bank |
|---|
| __GEN__ General | 43 questions |
Sample In Flight Navigation questions, answered and explained
Real questions from this chapter, with the answer marked and the reasoning written out — the same explanations you get inside the app.
0221066 · In Flight Navigation
Under a constant 40 kt headwind, the range performance at three pressure altitudes is:
16,000 ft: 8.84 ground nm per 100 kg of fuel
20,000 ft: 8.96 ground nm per 100 kg of fuel
22,000 ft: 9.80 ground nm per 100 kg of fuel
Which pressure altitude gives the best fuel economy for maximum range?
- AFL 160
- BFL 200
- CFL 220
- DEconomy is identical at all levels
Why that is the answer
For **maximum range** you want to cover as much ground as possible with the fuel you have. So the best level is the one that gives the most **ground nautical miles per 100 kg of fuel**, just like choosing the car that does the most miles per gallon.
These figures are already ground miles, so the headwind has been taken into account.
Compare: 9.80 at 22,000 ft is more than 8.96 at 20,000 ft, which is more than 8.84 at 16,000 ft.
So the best fuel economy for range is at **FL 220**.
**Tip:** higher levels often win for range because the thinner air gives a higher TAS for the same fuel flow.
0221077 · In Flight Navigation
At 0422 an aircraft at FL 370, groundspeed 320 kt, is on a direct track to VOR 'X', 185 nm away. It must cross VOR 'X' at FL 80. With a mean rate of descent of 1,800 ft/min at a mean groundspeed of 232 kt, what is the latest time to begin the descent?
- A0451.
- B0454.
- C0445.
Why that is the answer
Planning a descent works backwards from where you must arrive. The **rate of descent** (feet per minute) sets how long the descent takes. The **groundspeed** then turns that time into a distance over the ground. Look at the diagram: the top of descent (TOD) is that distance before the point where you must be level.
Once you know where the descent must start, the time you get there is now + the time to cruise up to that point.
Height to lose = 37,000 − 8,000 = 29,000 ft
Descent time = 29,000 ÷ 1,800 = 16.1 min
Descent distance = 232 kt × 16.1/60 h = 62.3 NM
Cruise distance left before the TOD = 185 − 62.3 = 122.7 NM
Cruise time = 122.7 ÷ 320 = 0.383 h = 23 min
TOD time = 0422 + 23 min = 0445
The latest time to start the descent is **0445**.
**Tip:** use the cruise groundspeed for the cruise part and the descent groundspeed for the descent part.
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Frequently asked
How many In Flight Navigation questions are there for the DGCA CPL Air Navigation paper?
Avielevate's bank carries 43 published In Flight Navigation questions for Air Navigation, mapped across 1 learning objective. Every one has its answer key, and explanations are being written across the whole bank.
How much of the Air Navigation paper is In Flight Navigation?
The DGCA does not publish a per-chapter breakdown of its papers, so nobody can honestly tell you — and we will not guess. What we can tell you is what students who have just sat a paper reported meeting, which is measured rather than rumoured: that is the exam recall report inside the app.
What is the best way to revise In Flight Navigation?
Sit a short timed set on this chapter alone, tag how sure you were of each answer, then drill the two that actually leak marks: the ones you got right while guessing, and the ones you got wrong while confident. Avielevate does that tagging for you and puts anything you got wrong back in front of you on a spaced schedule.
The rest of the Air Navigation paper
One account covers every chapter of every paper.
← All Air Navigation chapters · All six DGCA CPL papers