Final answer:
An amber Hydraulic DISPLAY typically indicates a warning or caution, which means that there is an issue that requires attention but is not an immediate failure. Amber is between green (normal operation) and red (serious malfunction or failure) and the specific meaning can vary by system.
Step-by-step explanation:
When the Hydraulic DISPLAY turns amber, it typically means option 1) It indicates a warning or caution. In aviation and other fields that use hydraulic systems, color-coded displays are used to communicate the status of various system components. An amber or yellow display often signifies that there is something that requires the attention of the operator, maintenance team, or pilot. It could be a sign of a condition that is outside the normal operating parameters but not necessarily indicative of an immediate failure.
A green display would usually indicate normal operations, while red might show a more serious malfunction or failure. Amber is in-between, indicating that something is not quite right, but it isn't an outright emergency. It is critical to refer to the specific equipment's manual or documentation for precise interpretations of warning colors as these can vary by machine and manufacturer.