What document provides detailed information on aircraft systems?

The correct answer is CODDE 1, as this document is specifically designed to provide detailed information on various aircraft systems, including their operational characteristics, maintenance requirements, and troubleshooting procedures. It serves as a crucial reference for flight crews and maintenance personnel, allowing them to understand how different systems within the aircraft operate, which is essential for both safe operation and timely maintenance.

The other options, while related to aircraft operations, do not provide the same level of detailed information about systems. For instance, the MMEL (Minimum Equipment List) outlines the equipment that can be inoperative while still allowing the aircraft to operate safely but does not delve into the intricacies of how systems function. The Fault Guide and CODDE 2 may also support operational decisions or provide fault isolation procedures, but neither of these documents focuses comprehensively on the detailed information about the aircraft systems like CODDE 1 does.