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MET SERVICES FOR AVIATION — DGCA CPL Aviation Meteorology
Chapter J20 of the Aviation Meteorology paper. 45 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 MET SERVICES FOR AVIATION 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 | 45 questions |
Sample MET SERVICES FOR AVIATION 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.
0329003 · MET SERVICES FOR AVIATION
What is a CODAR?
- ARadar Report
- BCoded ARFOR
- CUpper report from an aircraft, other than weather reconnaissance aircraft
Why that is the answer
**Concept**
Forecasters need observations of the **upper air**, not only at the ground. Radiosonde balloons are launched from relatively few stations, and over oceans and remote land there are almost none, so reports from aircraft in flight are very valuable.
**Explanation**
A **CODAR** is a coded **upper-air report from an aircraft in flight**, made by an ordinary aircraft such as an airliner, **not** by a weather-reconnaissance aircraft. A weather-reconnaissance flight, which is flown only to measure the weather, uses its own code called **RECCO**.
The report gives what the aircraft actually finds at its position and level: the wind direction and speed, the outside air temperature, and any turbulence, icing or significant cloud. It goes by radio to ATC and then to the met office. Forecasters compare it with their analysis and correct their forecasts and warnings if the real conditions are different. Today much of this is sent automatically by datalink from airliners, but the idea is the same: an aircraft telling the ground what the air aloft is really like.
**Applying it to the question**
A CODAR is not a radar report and not a coded area forecast. It is an **upper report from an aircraft, other than weather reconnaissance aircraft**.
**Remember for DGCA:** CODAR = upper-air report from an ordinary aircraft; RECCO = report from a weather-reconnaissance aircraft.
0329045 · MET SERVICES FOR AVIATION
In India, the National SIGWX chart is issued:
- A2 times a day
- B4 times a day
- C6 times a day
Why that is the answer
**Concept**
A **SIGWX chart** (significant weather chart) is a forecast map of the hazards to aviation: thunderstorm (CB) areas, turbulence, icing, jet streams, fronts and tropical cyclones. IMD compiles an **Indian National SIGWX chart** at **New Delhi**, with detail for Indian conditions.
**Explanation**
The weather that matters most over India changes quickly. Pre-monsoon thunderstorms and Norwesters build within hours, monsoon depressions move across the country, and cyclones over the Bay of Bengal and the Arabian Sea can strengthen fast. A chart drawn only once or twice a day would soon be out of date.
The national chart is therefore issued **4 times a day**, following the main 6-hourly cycle of observations and model runs (00, 06, 12 and 18 UTC), the same rhythm as the global charts. Each chart is valid for 24 hours, so there is always a fresh chart available that covers any flight being planned. When collecting the met folder, check the issue time and use the latest chart.
**Applying it to the question**
In India, the National SIGWX chart is issued **4 times a day**.
**Remember for DGCA:** Indian National SIGWX: compiled at New Delhi, 4 times a day, valid 24 hours.
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Frequently asked
How many MET SERVICES FOR AVIATION questions are there for the DGCA CPL Aviation Meteorology paper?
Avielevate's bank carries 45 published MET SERVICES FOR AVIATION questions for Aviation Meteorology, mapped across 1 learning objective. Every one has its answer key, and explanations are being written across the whole bank.
How much of the Aviation Meteorology paper is MET SERVICES FOR AVIATION?
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 MET SERVICES FOR AVIATION?
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 Aviation Meteorology paper
One account covers every chapter of every paper.
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