What is logged in the Aircraft Discrepancy Book (ADB) under fuel consumption?

In the context of logging information in the Aircraft Discrepancy Book (ADB) under fuel consumption, the correct entry includes details specific to different engine components. This typically encompasses records for engine #1, engine #2, as well as the Integrated Gearbox (IGB) and Tail Gearbox (TGB). Each of these components is critical to understanding the performance and operational efficiency of the aircraft's fuel systems.

Monitoring fuel consumption related to individual engine performance and associated gearboxes is essential for aircraft maintenance, helping to identify discrepancies that may affect flight operations or require maintenance intervention.

The other options, while relevant to fuel management and monitoring, do not specifically align with the detailed discrepancies regarding engine performance reflected in the ADB. For instance, logging fuel type and quantity is critical for overall fuel management but isn’t directly related to engine performance diagnostics. Monitoring fuel tank levels is straightforward but does not provide insight into engine-specific consumption rates. Documenting flight hours alongside fuel consumed can be useful for operational metrics but does not focus on the individual discrepancies that might require more immediate attention on the aircraft's components.