When will the Fuel Trapped caution display not show?

The situation in which the Fuel Trapped caution display will not show relates specifically to when a tank is selected to be isolated. In this scenario, isolating a tank involves shutting off the fuel flow from that tank, which effectively prevents the monitoring system from detecting fuel status in that isolated tank. As a result, the Fuel Trapped caution indicator is suppressed, and won’t display since the system no longer actively checks for trapped fuel in the isolated tank.

During normal operations, when tanks are connected and transferring fuel, or when fuel levels are critically low, the system actively monitors fuel distribution and tank status, thus prompting the caution display to alert the crew when necessary. Therefore, isolating a tank modifies the operational status to the point where the caution display is appropriately turned off for that particular fuel tank.