Downloaded from https://www.everyspec.com MIL-STD-1808C w/CHANGE 1 SYSTEM SUB-SYSTEM TITLE DEFINITION 63 ROTOR DRIVES The subsystem components that transmit power to the rotors. Includes engine coupling components, drive shafts, clutch and free wheel units, gear boxes, components, systems, and securing elements. 00 GENERAL 10 ENGINE/ GEARBOX COUPLINGS The portion of the system covering drive shafts between engines and main gear boxes and, if applicable, clutch and free wheel units. 20 GEARBOXES The portion of the system that drives the rotor. Includes mechanical power takeoff, accessory drives, gearbox lubricating system, and, if part of the gearbox, the rotor brake.
Does include the accessories themselves (alternators, hydraulic pumps, etc.). 30 MOUNTS, ATTACHMENTS Includes suspension bars, vibration damping systems, etc., providing attachment of the gearboxes to the airframe. 40 INDICATING The portion of the system that indicates operation or activation of rotor systems. Includes lights, gauges, switches, wiring, etc. 72