Slight correction on a previous posting on power checks. The purpose of the power check chart is to make sure your engine meets the minimum specification, on which all the rest of the performance of the aircraft is based.. .Most civil manuals are pretty poor in terms of performance information, especially in comparison to military charts (at least the US military style charts).. .The post about the sticking bleed valve is an excellent case in point- does the engine pass the power check? At the power settings where the bleed valve is sticking?