DECU's, DDR's & Power Assurance!!
Situation:
Company aircraft all capable of performing power assurance checks using on board equipment.
Most of the time, on board equipment works just fine resulting in a pass or a fail being displayed on said equipment.
However, when a fail is displayed, data is immediately ignored and paper charts pulled out. Data recorded long hand is then plotted on paper charts which, more often than not, result in a pass.
What I want to know is, if the on board equipment (which is deemed suitable to perform the power assurance) is working just fine and a fail is displayed, would that data not take precedence over everything else???