Final answer:
LVR CLB flashing on the FMA indicates that the pilot should adjust the thrust levers to the climb detent, optimizing the aircraft's climb performance.
Step-by-step explanation:
Shortly after takeoff, if LVR CLB flashes in column 1 of the Flight Mode Annunciator (FMA), it indicates that the autothrust system is recommending the pilot to move the thrust levers to the climb detent. The FMA is an important component in an aircraft's cockpit, displaying the current mode of the flight control systems, including autopilot and autothrust modes. When LVR CLB is flashing, the system is basically signaling to the pilots that the thrust levers need to be adjusted to match the current autothrust mode, which optimizes the aircraft's performance during the climb phase of the flight.