What should the indicator lamps do when an Inmarsat-C system powers up?

When an Inmarsat-C system powers up, the correct behavior of the indicator lamps is for all lamps to illuminate in a particular sequence as specified by the operator's manual. This sequence serves as a visual confirmation that the system is conducting its self-checks and that all components are functioning correctly during startup. The defined sequence is a standard operating procedure intended to help operators verify that the system initializes properly before it begins to operate and handle communications.

This startup sequence also provides an important diagnostic function, allowing the operator to identify any potential malfunctions based on the expected illumination and behavior of the indicator lamps. The specific sequence is detailed in the operator's manual, ensuring that the user has guidance on how to interpret the lamp signals during this critical phase.