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Airspeed Indicator

IAS → CAS → EAS → TAS → Mach

IAS250 kt
Flight Level350
OAT-50 °C
Position Error2 kt
Speed Conversion Chain
IAS
250
→
CAS
248
→
EAS
120
→
TAS
218
Mach Number
M 0.37
100150200250300350400
250
KIAS
ISA Dev
+4°C
ρ Ratio
0.304
a (local)
299 m/s
Limit
263 kt
Speed Arcs
Vs0-Vfe (Flaps)Vs1-Vno (Normal)Vno-Vne (Caution)Vne (Never Exceed)
Barber Pole

The red/white striped line shows the lower of VMO or MMO equivalent at current conditions. At high altitude, MMO becomes limiting before VMO.