Taken from
www.chinook-helicopter.com
One of the disadvantages of a fully articulated rotor system, such as that found on the CH-47 Chinook helicopter, is the susceptibility to ground resonance. Items to consider in limiting the chances of encountering ground resonance include ensuring that all tires are inflated to 88 psi and all landing gear struts and blade dampeners are properly serviced. The two videos below show the result of a Chinook helicopter falling victim to ground resonance. The tail number was 84-24156, and was the one that previously encountered uncommanded flight control inputs which resulted in the aircraft performing a barrel roll. After the roll incident, the aircraft was assigned to Aberdeen Proving Grounds in Maryland, and was utilized as a ground test device.
On a ferry flight from CCAD, 84-24156 rolled inverted in flight and was severely damaged. At some point, 84-24156 was assigned to Aberdeen Proving Grounds (APG), Maryland, and utilized as a ballistic evaluation device. Tied to the ground, projectiles were fired at 84-24156 while it was running. On an unknown date, 85-24156 experienced ground resonance and disintegrated while tied to the ground at Aberdeen. As of 1 January 2001, this aircraft was 35.9 years old. As of 27 February 2000, the last known location of 84-24156 is at Aberdeen, Maryland. Aircraft status: Ground evaluation test device.