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AviationRef / 01 / Observation and forecast

Weather: read the groups

METAR vs TAF
A METAR reports observed conditions; a TAF forecasts conditions during its stated validity.
Wind / 27015KT
From 270° true, at 15 knots. “From” matters when drawing the wind vector.
Visibility / 9999
10 km or more. US reports use SM for statute miles; 1 SM ≈ 1.609 km.
Cloud / BKN020
Broken layer with base at 2,000 ft above aerodrome level.
Temperature / 12/08
Temperature 12°C, dew point 8°C. M before a number means minus.
Pressure / Q1013
Altimeter setting 1013 hPa. A2992 instead expresses 29.92 inches of mercury.
FM vs TEMPO
FM starts a new prevailing forecast. TEMPO describes temporary fluctuations during a window.

Explain it back

Why does good visibility alone not tell you whether the weather is suitable?

Check: Cloud, wind, hazards, route, aircraft and applicable requirements still need assessment.

AviationRef / 02 / Heading, track and speed

Navigation: separate the directions

Heading
Direction the aircraft nose points.
Track
Direction of movement over the ground.
True airspeed
Aircraft speed through the surrounding air.
Groundspeed
Speed over the ground; use it with ground distance to estimate elapsed time.
Time
Hours = distance in nautical miles ÷ groundspeed in knots.
Fuel arithmetic
Fuel = time in hours × burn per hour. Use consistent units; required reserves and other allowances are additional.
Worked example
120 nm at 100 kt takes 1.2 h = 1 h 12 min. At 30 L/h, that segment uses 36 L.

Explain it back

If the wind pushes you south while you want to travel east, which way do you correct?

Check: Point north of east (left correction) so the air-relative motion cancels the southward drift.

AviationRef / 03 / UK readback study

Radio: check the instruction

Listen
Identify who is being called and what is being instructed. Ask for clarification when uncertain.
Heading example
Instruction: turn right heading 090. Readback content: right heading 090, followed by callsign.
SSR example
Instruction: squawk 4621. Readback content: squawk 4621, followed by callsign.
Runway example
Instruction: hold short of runway 27. Repeat hold short, runway 27 and callsign.
Do not substitute
“Roger” acknowledges receipt; it does not repeat the detail of an instruction requiring readback.
Scope
These are selected UK examples. Study the full CAA requirements and local procedures with an instructor. Digits here are written shorthand, not pronunciation guidance.

Explain it back

Does “hold short of runway 27” authorise crossing it?

Check: No. Read back and comply with the hold-short instruction; it is not a runway-crossing clearance.