MIL-S-901D – the gold standard of shock testing.
See the video at https://www.youtube.com/user/chassisplans.
Chassis Plans’ rugged military grade 4U M4U20 computer system has been successfully tested to MIL-S-901D Grade A for use in the SPAWAR NAVSSI rack. The test requires 4 shots, or explosions, in the water next to a barge in which the equipment is mounted. Thus this is commonly referred to as the Barge Test. The explosives are 60 pounds of HBX-1 placed 24 feet underwater between 20 and 40 feet from the barge.
Two testing grades are available. Grade A is the equipment must still be functional after the 4 shots. Grade B allows for the equipment to no longer function but no parts can fly off that might endanger persons or nearby equipment.
The Chassis Plans M4U20 computer passed the more rigorous Grade A requirement by continuing to function after all 4 shots without any repair or intervention.
The purpose of the test is to simulate Navy ships or submarines being hit with a torpedo, aerial bombardment or hitting a mine. Grade A equipment is necessary for the continued functioning of the ship after such an attack.
It might be noted the M4U system was a standard configuration and was not enhanced in any manner to prepare it for this punishing test.
Chassis Plans continues to support SPAWAR in their efforts to equip America’s war fighters with the most reliable and advanced equipment possible.
See Chassis-Plans.com for additional information.