What should be done if the bleed air temperature is too high?

In scenarios involving high bleed air temperatures, the most appropriate course of action is to engage the emergency shutdown procedure. This is critical because elevated bleed air temperatures can indicate a potential system failure or thermal overload, which may jeopardize the safety of the aircraft and its systems. By activating the emergency shutdown procedure, the pilot can quickly isolate the bleed air system from the rest of the aircraft systems, thus preventing further damage and ensuring safety.

The other choices might not effectively mitigate the risk associated with high bleed air temperatures. Increasing bleed air flow or engaging the anti-ice system could exacerbate the situation if the source of the high temperature is not addressed. Reducing power settings may have limited impact on correcting the issue if the underlying cause of the high temperature persists. Therefore, the emergency shutdown procedure is the most reliable and immediate response to ensure the safety of the aircraft and crew.