What is the purpose of instrument cross-check?

The purpose of instrument cross-check is fundamentally about ensuring that pilots can accurately interpret and manage multiple instruments effectively, which is crucial for flight safety. When pilots are flying under instrument flight rules (IFR), they cannot solely rely on visual references outside the aircraft. Instead, they must depend on their instruments to gauge the aircraft's performance, navigation, and attitude.

Cross-checking involves regularly verifying the information displayed across various instruments to make informed decisions and maintain control of the aircraft. This practice helps in detecting any discrepancies or malfunctions that may arise, allowing pilots to respond promptly and take corrective actions if necessary. It reinforces situational awareness and aids in maintaining operational safety, especially under challenging conditions like instrument approaches or adverse weather.

The other options do not focus on the key safety aspect of instrument cross-checking. For instance, confirming weight and balance pertains to aircraft performance and safety in general but is not directly related to the instrument cross-check process. Increasing speed during approaches does not relate to the proper management of instruments, and reducing cockpit workload could imply limiting necessary checks rather than engaging effectively with all relevant instruments to ensure safety.