Downloaded from https://www.everyspec.com MIL-STD-1808C w/CHANGE 1 SYSTEM SUB-SYSTEM TITLE DEFINITION 54 NACELLES/PYLONS The subsystem components and structural members that furnish a means of housing and mounting the power plant or rotor assembly. Includes skin, longerons, belt frames, stringers, clamshells, scuppers, doors, nacelle fillets, fitting, etc. Also includes the structure of power plant cowling inclusive of the structural portion of the inlet whether or not integral with the aircraft. Does not include structural portions of the exhaust system not integral with the airframe.
00 GENERAL 10 NACELLE MAIN FRAME The portion of the system that forms the primary skeleton of the nacelle, including frames, bulkheads, firewalls, stringers, keel, frames around openings, etc. 20 NACELLE AUXILIARY STRUCTURE The portion of the system that forms the secondary structure in the nacelle including leading and trailing edge structure, etc. Does not include plates or skin. 30 NACELLE PLATES/SKIN The portion of the system that forms the exterior covering of the nacelle. Includes access covers, cowling and doublers.
40 NACELLE ATTACH FITTINGS The portion of the system used to attach the nacelle to its connecting structure, power plant, or thrust reverser, and for the support of equipment within the nacelle. 50 PYLON MAIN FRAME The portion of the system that forms the primary skeleton of the pylon. Includes frames, bulkheads, firewalls, stringers, keel, frames around openings, etc. 60 PYLON AUXILIARY STRUCTURE The portion of the system that forms the secondary structure in the pylons. Includes leading and trailing edge structure, etc. Does not include plates or skin. 70 PYLON PLATES/SKINS The portion of the system that forms the exterior covering of the pylons.
Includes access covers, cowling, and doublers. 80 PYLON ATTACH FITTINGS The portion of the system used to attach the pylon to its connecting structure, power plant, or thrust reverser, and for the support of equipment within the pylon. 90 FILLETS/FAIRINGS The portion of the system that forms aerodynamic fairings between the nacelle or pylon and it's connecting structure. 64