MIL-DTL-43511D, DETAIL SPECIFICATION: VISORS, FLYER'S HELMET, POLYCARBONATE (16 JUL 1990) [SUPERSEDING MIL-V-43511C]

MIL-DTL-43511D, DETAIL SPECIFICATION: VISORS, FLYER'S HELMET, POLYCARBONATE (16 JUL 1990) [SUPERSEDING MIL-V-43511C]., This specification covers general and performance requirements for curved polycarbonate flyer's helmet visors worn by aircrew personnel.