During high-altitude test flights, an auxiliary turbine's intake pressure fluctuated only after the aircraft exceeded Mach 1.4 in sub-zero humidity conditions. Although maintenance technicians repeatedly calibrated the primary fuel injectors and verified that the manifold was free of debris, telemetry logs revealed a sharp temperature spike across the bypass duct immediately preceding each pressure drop. Flight engineers subsequently directed ground crews to install thermal insulation wraps around the outer bypass housing instead of replacing the fuel delivery assembly.
Based on the passage, what does the engineers' directive imply regarding the root cause of the pressure fluctuations?
- AThe primary fuel injectors had accumulated mechanical debris inside the manifold during supersonic flight.
- The pressure drops resulted from temperature-related conditions affecting the bypass duct rather than a mechanical fuel delivery failure.Answer
- CThe aircraft's auxiliary turbine suffered irreversible structural damage whenever flight speeds exceeded Mach 1.4.
- DThe aircraft cannot safely operate in sub-zero humidity without a complete mechanical redesign of the turbine manifold.
Answer
The pressure drops resulted from temperature-related conditions affecting the bypass duct rather than a mechanical fuel delivery failure.
The correct answer accurately synthesizes the telemetry data and the engineers' actions. Telemetry revealed temperature spikes across the bypass duct immediately prior to pressure drops, and the engineers specifically ordered thermal insulation wraps around the bypass housing while choosing not to replace fuel delivery hardware. This deliberate choice directly implies that thermal stress on the duct was the root cause of the pressure instability.
Step-by-Step Solution
Key Concept
Identifying Implied Meanings
Estimated Time:1m 15s