When installing an instrument in an aircraft, who is responsible for ensuring it is properly marked?

The responsibility for ensuring an instrument is properly marked during installation lies with the maintenance crew. This is crucial because the maintenance crew is tasked with the overall upkeep and safety of the aircraft, which includes adhering to regulations and guidelines regarding the installation of instruments. Accurate markings are essential for not only the operation of the instrument but also for compliance with regulatory standards, ensuring that information is easily readable and interpretable by the pilot during flight operations.

The maintenance crew typically follows specific protocols that govern the marking of various instruments, including altimeters, airspeed indicators, and navigation devices, ensuring they meet safety and regulatory requirements. This attention to marking is part of ensuring the instrument's effectiveness and reliability, which is critical for safe aircraft operation.