Which maneuver is recommended if a passenger is experiencing ear pain on descent?

The Valsalva maneuver is the recommended action for relieving ear pain during descent. This maneuver aids in equalizing the pressure in the middle ear with the ambient pressure. During descent, the natural pressure change can cause discomfort or pain in the ears due to a blockage of the Eustachian tubes, which connect the throat and middle ear. The Valsalva maneuver involves pinching the nose, closing the mouth, and gently exhaling to increase air pressure in the throat, which helps to open the Eustachian tubes and equalize pressure in the ears.

Other options such as a rapid ascent could exacerbate the pressure discrepancy and lead to further discomfort or injury. Taking off for a diversion may not be practical in dealing with ear pain and might not resolve the underlying issue. Sipping water can help to some extent by promoting swallowing, which may open the Eustachian tubes, but the Valsalva maneuver is more directly effective for equalizing ear pressure. Therefore, utilizing the Valsalva maneuver is the most appropriate recommendation for alleviating ear pain during flight descent.