Which engine system has failed?

• A. Fadec
• B. Vartoms (Variable Rotor Speed Torque Matching System)
• C. N2 gear train
• D. Hydraulics

Answer: (B)

The key idea is recognizing which subsystem directly controls the relationship between rotor speed and engine torque. The Variable Rotor Speed Torque Matching System is responsible for balancing rotor speed with the engine’s torque output. If this system fails, you’d see a mismatch in rotor RPM and torque, leading to abnormal rotor behavior or instability in power transfer. That direct link to rotor speed and torque makes it the most plausible cause for an engine-system failure in this context.

Fadec is the engine control computer that manages fuel flow and timing; its failure would show up as control faults or degraded engine performance rather than a rotor-torque mismatch. The N2 gear train drives the core compressor and accessories; a failure there would disrupt core engine operation or accessory power. Hydraulics powers non-engine systems like flight controls; its failure affects hydraulic components rather than the engine-torque relationship.