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ata definitions of aircraft groups, systems and sub-systems : chap. sec. title: description: group definition — aircraft: the complete operational unit.. Owner’s Manual Refrigerated Compressed Air Dryers Model F-20 Read carefully before attempting to assemble, install, operate or maintain the. no. name; 1: 0a/eexhaust gas turbocharger: 2: electrical equipments for auto-tension winch: 3: no.1&2 main engine c.f.w pump: 4: portable daylight signalling lamps.