Originally Posted by
etudiant
IIrc, the original UH60 requirement called for a survivable heavy landing, with the undercarriage collapsing to take up part of the shock and the cabin remaining sufficiently intact to allow the passengers to survice.
The flattened airframe in the pictures shows that these requirements were not met in this test.
A quick search reveals the UTTAS crashworthiness requirement is a 42 ft/sec vertical sink rate.
The test case shown had an approximately 3 second drop time, which equates to 144 ft altitude, and 96 ft/sec sink rate at impact (ignoring vertical drag and Chinook downdraft).