Under what condition can a pilot operate with inoperable instruments?

Operating an aircraft with inoperable instruments is governed by specific regulations. The correct condition under which a pilot can do this is if a Minimum Equipment List (MEL) is available and authorized. An MEL provides a list of instruments and equipment that may be inoperative under certain conditions, allowing the pilot to operate the aircraft legally and safely despite those inoperable components.

The MEL is tailored to individual aircraft and helps ensure that the pilot is aware of what is permissible regarding inoperable equipment. When an MEL is utilized appropriately, it outlines the specific conditions and operation allowances, including any restrictions or operating limitations that must be adhered to while flying the aircraft.

Operation without adherence to these established guidelines could compromise safety and regulatory compliance, making the use of an MEL essential when certain instruments are not functioning.