Final answer:
The attitude of an airplane can be verified and crosschecked using instruments such as the attitude indicator, gyroscopic compass, and altimeter.
Step-by-step explanation:
In order to verify and crosscheck the attitude of an airplane, pilots use various instruments such as an attitude indicator (sometimes called an artificial horizon), a gyroscopic compass, and an altimeter.
The attitude indicator provides a visual representation of the aircraft's position in relation to the horizon, allowing the pilot to determine if the plane is climbing, descending, or maintaining level flight. The gyroscopic compass provides the pilot with the aircraft's directional heading, while the altimeter measures the aircraft's altitude above sea level.
By using these instruments together and cross-referencing their readings, pilots can ensure that the airplane is maintaining the correct pitch, roll, and yaw angles during flight.