Which parameter is NOT typically monitored for engine health assessment?

The parameter that is not typically monitored for engine health assessment is aircraft seating configuration. This aspect pertains to the design and layout of seating within an aircraft and does not provide relevant data regarding the performance or condition of an engine. Engine health monitoring focuses on parameters directly related to engine performance and operational efficiency, such as fuel consumption efficiency, vibration levels indicating mechanical integrity, and N2 speed margin, which is critical for determining the optimal operating conditions of the engine.

In contrast, specific fuel consumption relates directly to how efficiently the engine uses fuel, while vibration levels can indicate issues like imbalance or wear within the engine components. N2 speed margin checks how close the engine operates to its maximum allowable speed, providing insights into its operational safety and efficiency. Thus, while the other choices are integral to engine health assessment, the seating configuration simply does not link to engine performance diagnostics.