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Nonshatterable, 514-cu in., O breathing cylinders, which were charged to 1800 + or - 50 psi, were installed in 3 bracket assemblies; 0.50-cal M2 AP projectiles were fired into the assemblies at impact angles of 45, 35 and 90. Two of the bracket assemblies satisfactorily retained the cylinders.

The fuel-cell installation was subjected to (1) 0.30-cal ball and 0.50-cal AP projectiles which were fired from a range of 75 ft, and (2) fragments from a statically detonated 40-mm HE projectile which was placed 24 in. outside of the installation. Tabulated gunfire-test results show that 21 of the 22 qualifying wounds sealed satisfactorily.

Tests were conducted to determine the ability of each piston-type accumulator to remain in 1 piece and the material of the cylinder to resist excessive tear (the size of the tear not to exceed 3 in. in any 1 direction beyond the hole cut by the projectile) when subjected to a 0.50-cal incendiary- projectile impact. The 50-cu in. accumulators failed to comply with specifications. The 200-cu in. accumulators performed satisfactorily. The 100-cu in. accumulator charged with hydrolube for comparison with petroleum-base hydraulic fluid failedto remain in 1 piece. The fluid and air end caps employed on the accumulators performed satisfactorily.