: THE NASA GLENN RESEARCH CENTER (GRC) AIRCRAFT OPERATIONS OFFICE REQUIRES NUMEROUS MODIFICATIONS BE CONDUCTED ON GRC AIRCRAFT TO INCLUDE THE UNIQUE SYSTEMS ON THE S-3B VIKING RESEARCH AIRCRAFT NASA 601 TO MEET AGENCY AND EXTERNAL CUSTOMER PROJECT REQUIREMENTS FOR THE AIRCRAFT. IN ADDITION, SIMILAR MODIFICATIONS MAY BE REQUIRED ON OTHER GRC AIRCRAFT (TWIN-OTTER, T-34C, LEARJET). THE FOLLOWING WORK WILL BE COMPLETED UNDER NASA AIRCRAFT OPERATIONS OFFICE OVERSIGHT CONDUCTED IN THE NASA GRC FLIGHT RESEARCH HANGAR (GRC BUILDING 4) IN CLEVELAND, OH. NASA GRC AIRCRAFT OPERATIONS OFFICE PERSONNEL WILL ASSIST WITH AIRCRAFT PREPARATION FOR THE SYSTEMS UPGRADES TO INCLUDE REMOVAL AND INSTALLATION OF NECESSARY ACCESS PANELS AND STRUCTURE/SYSTEMS CURRENTLY INSTALLED ON THE AIRCRAFT.