Multiple choice

Which of the following would not affect the reading on a machmeter?

  1. Speed of the airplane

  2. Altitude

  3. Temperature

  4. Weight of the airplane
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A Machmeter reading depends on the aircraft's speed relative to the speed of sound at the local altitude. The speed of sound varies with temperature, which varies with altitude. Therefore, the Machmeter responds to changes in speed, altitude (through temperature), and temperature directly. Aircraft weight affects lift and stall speed but does not influence the Mach number calculation or display.

Keep practicing — related questions