The Space orbiter is the orbital spacecraft of the Space Shuttle program. This space-plane carries crews and payloads, performs on-orbit operations, then re-enters the atmosphere with crews and any on-board payload to the Earth.

During an investigation of the vibration in the Space Orbiter, Raghavendra Rao, an aerospace engineer at a major aerospace and defense corporation, suspected that a structure located in the proximity of Main Engine Ignition (MEI) may vibrate as a result of resonance caused by MEI acoustic environment.

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