What should you avoid during oil system malfunction if only the amber oil pressure warning is illuminated?

When the amber oil pressure warning is illuminated, it indicates a potential issue with the oil system that could lead to engine failure or reduced engine performance. During this situation, it is crucial to minimize any unnecessary changes in the power control lever (PCL) settings.

Unnecessary PCL movements can exacerbate the problem by placing additional strain on the engine, potentially leading to a complete loss of oil pressure if the situation worsens. It is important to manage the engine's power settings conservatively to maintain stability and allow for any further diagnostics or reactions to the malfunctioned oil system.

Other actions that could be taken, like high maneuvers, PCL adjustments, or emergency landings, may not be advisable due to the risk of sudden changes affecting engine performance or causing additional complications. Thus, avoiding unnecessary PCL movements is the right course of action in this scenario.