Which of the following is a function of the ASME A17.3 standard?

The ASME A17.3 standard specifically addresses the safety of existing elevators and escalators. Its purpose is to provide guidelines and requirements for the maintenance, alteration, and repair of elevators that are already in operation. This standard is crucial for ensuring that these older systems continue to operate safely and effectively, which is vital given that many elevators in service may not meet current technology and safety standards.

The focus on existing elevator safety includes directives on inspecting and testing these systems, as well as recommendations for the necessary updates to maintain safe operation. This makes the correct answer relevant to the broader context of elevator systems management and safety compliance.

The other options pertain to different aspects of the elevator industry: guidance on control panel operation, manufacturing standards, and inspection procedures for specific types of lifts fall outside the scope of ASME A17.3 and are addressed in other standards or guidelines within the ASME A17 series.