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Difficulty: HardDrawing Logical Conclusions

Modern turbofan engines utilize dual-channel Full Authority Digital Engine Control (FADEC) units to regulate fuel flow and monitor turbine blade vibrations. If Channel A detects sensor data drift exceeding three percent, it automatically transfers operational command to Channel B, provided Channel B's internal diagnostics verify zero sensor anomalies. However, if Channel B also exhibits sensor drift or communication latency, the system locks fuel metering valves at their last known steady-state position rather than defaulting to mechanical backup controls. During a high-altitude cruise evaluation, an engine experienced simultaneous Channel A telemetry drift and Channel B communication latency.

Based on the passage, which of the following conclusions can be logically drawn regarding the engine's fuel metering during the evaluation?

  1. A
    Channel A automatically transferred operational command to Channel B because internal diagnostics verified zero sensor anomalies.
  2. The fuel metering valves remained locked at their prior steady-state position instead of switching to mechanical backup controls.Answer
  3. C
    The flight crew initiated emergency throttle overrides to shut down the engine and prevent catastrophic turbine failure.
  4. D
    The system activated mechanical backup controls because both digital channels exhibited concurrent diagnostic failures.

Answer

The fuel metering valves remained locked at their prior steady-state position instead of switching to mechanical backup controls.
The passage provides explicit conditional logic: when Channel A encounters drift and Channel B simultaneously exhibits latency, the system holds fuel metering valves in their last known steady-state position rather than switching to mechanical backup controls. Because both faults occurred concurrently during the evaluation, this exact operational state was triggered.

Step-by-Step Solution

1
Analyze the specific scenario presented in the passage
The test scenario involves concurrent Channel A telemetry drift and Channel B communication latency.
Identifying the active conditions is required to determine which system rules apply.
2
Evaluate the conditional rule governing dual-channel anomalies
The text states that if Channel B exhibits drift or latency while Channel A fails, the system locks fuel metering valves at their last known steady-state position rather than reverting to mechanical backup.
Connecting the scenario parameters to the conditional logic establishes the direct consequence.
3
Synthesize the logical deduction
The engine's fuel metering valves were held in their last steady-state setting without engaging mechanical backup controls.
A valid logical conclusion must follow strictly from the verified premises without extraneous assumptions.

Key Concept

Drawing logical deductions from multi-condition technical procedures
Estimated Time:1m 30s
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Topics

Drawing Logical Conclusions

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