Which type of check is the most comprehensive and includes major repairs for the ERJ aircraft?

The most comprehensive type of check for Embraer Regional Jets is the D-Check. This extensive maintenance check is typically performed every 6 to 10 years and is the most thorough examination of the aircraft. It involves a detailed inspection of the entire aircraft structure, systems, and components. During a D-Check, numerous systems are disassembled, inspected, repaired as necessary, and often overhauled to ensure the aircraft's safety and airworthiness for continued service.

D-Checks also usually include major repairs, modifications, and updates that may not be conducted during the other, less comprehensive checks. Given the scope of work involved, D-Checks are more time-consuming and costly compared to the routine inspections like A-Checks and C-Checks, which focus on less critical tasks or are performed more frequently. This significant effort and attention to detail in the D-Check are essential for maintaining the long-term operational integrity and safety of the aircraft.