The airspeed indicator may be the oldest and most fundamental of the flight instruments, but it is also the one least suited to its job, which is primarily not to tell us how fast we are going but rather where we are in the flight envelope. It is pleasant to know, as we cruise along, that we are indicating 137 knots; but the airspeed indicator is most important at low speeds, close to the stall, and it is there that it is most likely to play us false.
Kill All the Airspeed Indicators
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