Where is the Airborne Vibration Monitoring System located?

Where is the Airborne Vibration Monitoring System located?

• A. Near Forward End of Engine (#1 Bearing) on the Fan Frame Compressor Case
• B. On the Tail End of the Engine
• C. On the Accessory Gearbox
• D. Inside the Core

Answer: (A)

Vibration monitoring is placed where it can best reflect the health of the engine’s front-end components, especially the first bearing, so early signs of wear or misalignment can be detected before they affect the rest of the engine. The Airborne Vibration Monitoring System is located near the forward end of the engine, on the fan frame/compressor case at the #1 bearing. This position captures vibration from the front section where critical bearings reside and where faults tend to start, and it keeps sensors in a stable, accessible mounting that isn’t overwhelmed by heat or exhaust from the core. Placing sensors at the tail end wouldn’t reliably indicate bearing health the way front-end sensors do, as it would mainly pick up other sources of vibration further down the line. Mounting on the accessory gearbox would monitor gear-drive issues rather than the engine’s bearing condition. Putting sensors inside the core would be impractical due to heat, accessibility, and maintenance concerns.

Vibration monitoring is placed where it can best reflect the health of the engine’s front-end components, especially the first bearing, so early signs of wear or misalignment can be detected before they affect the rest of the engine. The Airborne Vibration Monitoring System is located near the forward end of the engine, on the fan frame/compressor case at the #1 bearing. This position captures vibration from the front section where critical bearings reside and where faults tend to start, and it keeps sensors in a stable, accessible mounting that isn’t overwhelmed by heat or exhaust from the core.

Placing sensors at the tail end wouldn’t reliably indicate bearing health the way front-end sensors do, as it would mainly pick up other sources of vibration further down the line. Mounting on the accessory gearbox would monitor gear-drive issues rather than the engine’s bearing condition. Putting sensors inside the core would be impractical due to heat, accessibility, and maintenance concerns.