Bids Are Invited For The Maintenance Of The Heat Exchangers Of Riachuelo Class Submarines, Carried Out By The Madeira Island Maintenance Shipyard, Requires Continuous Improvement Of The Set Of Tools And Materials Made Available To Technical Teams, In Order To Guarantee The Execution Of Services With The Quality, Safety And Efficiency Standards Required To Preserve The Operability Of Naval Assets. This Acquisition Is Based On Art. 11, Item I, Of Law No. 14,133, Of April 1, 2021, Which Guides Public Contracts To Achieve Concrete Results In Favor Of The Public Interest, As Well As The Planning Duty Provided For In Art. 18 Of The Same Legal Diploma, Which Imposes On The Administration The Obligation To Precisely Define The Object To Be Contracted And Its Adequacy To The Identified Need.