The 43P-2, 43P-3 & 43P-4 guides have been replaced in the mid 1980's with 1 book. 43P-1: Work middle Maintenance handbook prior to OPNAV numbering the current steering 4790/4(series) it was 43P. The series of textbooks 43P-1, 43P-2, 43P-3 & 43P-4 were being individual publications covering all aspects of upkeep. V2 Division: Maintenance of Catapults and Arresting Gear. AIMD: Aircraft Intermediate Maintenance Department.