A first-order surrogate would be true airspeed, from which, knowing the density altitude, indicated airspeed could be accurately calculated. Since the airplane’s relationship to the air ...

“In the black box there were four flights that experienced problems with the airspeed indicator ... Air said the problem was fixed, is it true the problem was cleared? If not, technicians ...

“We are formulating, with NTSB and Boeing, detailed inspections regarding the airspeed indicator,” he said ... Air said the problem was fixed, is it true the problem was cleared?" ...

You might assume that indicated airspeed — it’s displayed in knots, after all — equals the closing speed of the wing and the air’s molecules. In fact, that’s only true at sea level in ...