The fundamental objective of the Digital Avionics Information System (DAIS) Life Cycle Cost (LCC) Study is to provide the Air Force with an enhanced in-house capability to incorporate LCC considerations during all stages of the system acquisition process. The purpose of this report is to describe the technical approach, results, and conclusions obtained from a Maintenance Task Analysis (MTA) conducted on a mid-1980s DAIS conceptual design configuration to identify and quantify support maintenance task requirements. The approach taken was to identify major system design changes and innovative support system capabilities projected to be available in the mid-1980s timeframes, along with major mechanization differences between the current and 1980s DAIS conceptual design configurations. These were quantified in terms of their impact on maintenance support task requirements on the basis of an analysis of their impact on system reliability and maintainability parameters. Three areas having significant impact on maintenance requirements were studied in some detail. First the impact of the DAIS architecture in terms of system reliability was quantified in terms of the demand on the maintenance system. Then two major innovations in system support capability, projected to be available in the mid-1980s timeframe, were evaluated in terms of their impact on the maintainability of the DAIS avionics. Results indicate that the mid-1980s DAIS configuration with these innovations should yield a 47% reduction of total direct maintenance manhour requirements when compared with a conventional avionics suite. (Author/DAG)