Projects:EASA PPL/Units & General

Distances

• 1 NM = 1,852 km
• 1 NM = 6080 ft
• 1 m = 3,28 ft
• 1 statute mile = 1,609 km

Weight

• 1 kg = 2.205 pounds

Volume

• 1 US-Gal = 3.785 L
• 1 Imp-Gal = 4.546 L

Pressure

• Standard Pressure = 1013.25 hPa
• 1hPa = 27ft

Sphere

• Big circle: 1° = 60NM

Speed

• ICE-T
  • Indicated Airspeed
    • ↓ correct for instrument error
  • Calibrated Airspeed
    • ↓ correct for compressibility (negligible below 200kts and 10.000ft )
  • Equivalent Airspeed
    • ↓ correct for altitude and non-ISA temperature (~ +2% for each 1000ft
  • True Airspeed

Altitude

• Indicated Altitude (set to QNH)
• Pressure Altitude (set to 1013.25)
• Density Altitude (corrected for temperature)
• True Altitude

Q-Codes

Altimeter settings

Code	Meaning	Sample use
QNH	Atmospheric pressure at mean sea level (may be either a local, measured pressure or a regional forecast pressure (RPS)). When set on the altimeter it reads altitude.	Request Leeds QNH
QFE	Atmospheric pressure measured at the airport station. When set, the altimeter reads the height above the station. Not in common use.	Runway in use 22 Left, QFE 990 millibars
QNE	Indicated altitude at the landing runway threshold when 1013.25 hPa or 29.92 inHg (atmospheric pressure at sea level in the International Standard Atmosphere) is set as altimeter setting.
(QFF)	Atmospheric pressure at a place, reduced to MSL using the actual temperature at the time of observation as the mean temperature.

Radio Navigation

Code	Meaning	Sample use
QDM	Magnetic bearing to a station	(callsign) request QDM (callsign)<ref name="caa.co.uk">CAP 413 Radiotelephony Manual 21 2 complete.pdf Template:Webarchive, p.12</ref>
QDL	Series of bearings taken at regular intervals
QDR	Magnetic bearing from a station	(callsign) request QDR (callsign)<ref name="caa.co.uk"/>
QFU	Magnetic bearing of the runway in use	Runway 22 in use, QFU 220<ref>QFU on The Free Dictionary</ref>
QGE	Distance
QGH	Controlled Descent through Clouds (Royal Air Force use)
QTE	True bearing/track from a station	(callsign) request QTE (callsign)<ref name="caa.co.uk"/>
QTF	Position in relation to a point of reference or in latitude and longitude
QUJ	True bearing/track to a station

Angles

GAGA
HHAG
SCTA