A gyroscope in an airplane is firstly a gyroscope, so it works
by maintaining its orientation in space. The instruments in an
airplane that use a gyroscope are the attitude indicator, the
heading indicator and the turn coordinator. The attitude indicator
and heading indicator's gyroscope runs when the vacuum pump on the
airplane sucks air in and over the blades to cause the gyroscope to
spin. When the gyro spins rapidly (up to 18000rpm) it aligns itself
upright and the airplane's instrument aligns itself.