Final answer:
A fault light on the CTR TK PUMPS 1(2) pushbutton indicates a malfunction with the center tank fuel pump, requiring attention from the flight crew for the safety of aircraft operations.
Step-by-step explanation:
When the fault light is illuminated on the CTR TK PUMPS 1(2) pushbutton, it indicates that there is a malfunction with one of the center tank fuel pumps in an aircraft. This could be due to several issues such as electrical problems, a mechanical failure, or a lack of fuel in the tank which means the pump is running dry.
It is important for the flight crew to take note of this and follow proper procedures to assess and correct the issue, ensuring the continued safe operation of the aircraft's fuel system.