BO-105 helicopter pilot & cockpit during in flight rotorcraft acoustics program Distance Versus Noise Calibration over Livermore - Central Valley, CA. The YO-3A flying the acoustics test can just be seen through cockpit window.

YO-3A during in flight rotorcraft acoustics program Distance Versus Noise Calibration test on BO-105 over Livermore - Central Valley, CA

YO-3A (NASA-718) & BO-105 helicopter over Livermore Valley for in flight Rotorcraft Acoustics Program - distance versus noise calibration

YO-3A (NASA 718) and BO-105 helicopter over Livermore Valley, CA: In-flight rotorcraft acoustics program (distance versus noise calibration)

view of YO-3A from cockpit of BO-105 helicopter during in flight rotorcraft acoustics program Distance Versus Noise Calibration over Livermore - Central Valley, CA