Experimental Data - Group I https://hdl.handle.net/11256/1000 2026-04-22T15:56:47Z PPG PR-2930 MIL-PRF-32662A qualification data https://hdl.handle.net/11256/1002 PPG PR-2930 MIL-PRF-32662A qualification data PPG PR-2930 MIL-PRF-32662 test data