Altimetry Flashcards
Transition Altitude
QNH to SPS - Departure
Transition Layer
Layer between transition altitude and transition level
Transition Level
SPS to QNH on arrival
Surface Pressure on true + indicated when flying towards high
True altitude will increase for same indicated altitude
More distance between pressure lines
Low surface pressure on true and indicated altitude
True altitude will be less than what is indicated
Pressure lines are closer together
Temp Error Correction
4 x ISA Dev x layer of air/1000
QFE
Height - Atmospheric pressure at official aerodrome from elevation
QFF
QFE reduced to MSL using actual conditions
QNH
MSL Pressure Level
True ALT vs Altimeter
TA and altimeter reading Varys greater with altitude
RQNH
Regional QNH
Lowest forecast QNH within ASR
Valid for 1 hour