IAS — the speed of the aircraft as observed on the ASI — Aviation Definition

Words for: Performance & Limitations

aircraft performance
takeoff
endurance
landing
pressure altitude
density altitude
Structure of the Atmosphere
Fahrenheit
1013.2 millibars
Celsius
molecular cohesion
density altitude chart
Effect of Temperature on Density
Effect of Humidity (Moisture) on Density
rate of climb
aerodynamic configuration
minimum level flight airspeed
climb performance
kilowatts
kw — kilowatts
angle of climb
VX
VY
propulsive power
compressibility effects
supercharging
region of reversed command
unaccelerated condition
rate of acceleration/deceleration
Runway Surface and Gradient
Airport/Facility Directory
grooved
minimum hydroplaning speed
hydroplaning speed
aerodynamic braking
lift-off speed
minimum dynamic hydroplaning speed
turbofan engine
continuous peak deceleration
unsupercharged reciprocating engine
supercharged reciprocating engine
thrust reversers
retarding force
Crosswinds
energy dissipation
IAS — the speed of the aircraft as observed on the ASI
CAS — the ASI reading corrected for position (or installation) and instrument errors
VS1 — the calibrated power-off stalling speed or the minimum steady flight speed at which the aircraft is controllable in a specified configuration
VFE — the highest speed permissible with the wing flaps in a prescribed extended position
VA — the calibrated design maneuvering airspeed
EAS — equivalent airspeed
adiabatic compressible flow
antilock braking
performance speeds
design maneuvering airspeed
PPH — pounds per hour
KIAS
interpolation
takeoff charts
50 ft OBS
performance
peak EGT
headwind component
0.2 VS0
wheel fairings
landing charts
stall speed performance chart
Transport Category Aircraft Performance
Air Carrier Obstacle Clearance Requirements

69 words in this area · Next word: CAS — the ASI reading corrected for position (or installation) and instrument errors →

Plain English Meaning

It is simply the airspeed number you see on the dial in front of you — the raw reading, with nothing adjusted or corrected.

Full Definition

Indicated Airspeed (IAS) is the speed shown directly on the airspeed indicator (ASI) in the cockpit, before any corrections are applied for instrument error, position error, air density, or compressibility. It reflects the dynamic pressure sensed by the pitot-static system at the moment of reading.

Context Anchor

You will see IAS in performance speed discussions, aircraft manuals, checklists, and cockpit speed callouts where is expected to fly the number shown on the airspeed indicator.

IAS — the speed of the aircraft as observed on the ASI

Plain English Meaning

Full Definition

Context Anchor

Derivation

Why Pilots Care

Grounding Statement

Intuition Check

Example Sentence 1

Example Sentence 2