This specification covers forced air-cooled standard avionics enclosures, hereinafter referred to as enclosures. The enclosures accommodate Standard Electronic Modules (SEMs) Format B Span 2, Format C, and Format E, and a standard backplane. Intended Use: The enclosures covered by this specification are used in the production and maintenance of military aircraft exposed for prolonged periods to extreme seagoing environments not encountered by civilian aircraft. These enclosures provide cooling for the enclosed devices, protection from the environment, and shielding from electromagnetic interference (EM) unique to the military environment. The enclosures covered by this specification are not used in commercial aircraft.

This specification covers forced air-cooled standard avionics enclosures, hereinafter referred to as enclosures. The enclosures accommodate Standard Electronic Modules (SEMs) Format B Span 2, Format C, and Format E, and a standard backplane. Intended Use: The enclosures covered by this specification are used in the production and maintenance of military aircraft exposed for prolonged periods to extreme seagoing environments not encountered by civilian aircraft. These enclosures provide cooling for the enclosed devices, protection from the environment, and shielding from electromagnetic interference (EM) unique to the military environment. The enclosures covered by this specification are not used in commercial aircraft.