First guess was dropping a dropsonde[0], but watching the video and cross-checking a P-3 cockpit[1], looks like he's controlling the throttle. [0] https://en.w

First guess was dropping a dropsonde[0], but watching the video and cross-checking a P-3 cockpit[1], looks like he's controlling the throttle. [0] https://en.wikipedia.org/wiki/Dropsonde https://en.wikipedia.org/wiki/Dropsonde [1] https://i.pinimg.com/originals/f5/79/e9/f579e91f79ac79d91dc0bb85af37eebf.jpg https://i.pinimg.com/originals/f5/79/e9/f579e91f79ac79d91dc0...