VERTICAL SPEED INDICATOR
SENSE RATE OF CHANGE of static pressure measured in : feet per minute / meters per second
Vsi
Since there is a delay in the pressure equalising there will be an indication of climb or descent
Accelerometer unit / metering unit
iVSI : THE PLUNGER moves down in case a climb making a high pressure in the restriction line and making a suction in the capsule line, indicating an instantaneous climb indication
Vsi errors
~instrumnet
~manouvre
~position
~turning error
~sensitivty to turbulance