MIL-PRF-24751A, PERFORMANCE SPECIFICATION, FANS, VANEAXIAL GAS TURBINE ENCLOSURE COOLING NAVAL SHIPBOARD (16 DEC 2004) [SUPERSEDING MIL-F-24751]., This specification covers high pressure and HI shock, type TA vaneaxial fans for use in cooling the gas turbine enclosures of ship propulsion/generator systems.