What are five things you can find in the MCC?

• A. SB, AD, TO, EA, OTC
• B. SB, AD, TO, EA, ETA
• C. SB, TO, EA, OTC, AD
• D. SB, AD, TO, OT, EC

Answer: (A)

In engine configuration management, the MCC serves as a central home for the kinds of official change and instruction documents that guide how engines are modified, inspected, and operated. The five items listed—SB, AD, TO, EA, and OTC—represent a natural, integrated set of artifact types you’d expect to find together there. Service Bulletins communicate recommended actions or inspections for operators and maintainers. Airworthiness Directives are mandatory regulatory instructions that must be followed. Technical Orders provide the official procedures for performing work. Engineering Analyses document the justification and effects of a proposed change, weighing safety, reliability, and performance. OTCs capture formal change-related guidance or approvals that tie the modification process together from design through implementation. Together, these five categories cover the practical, governance, and execution aspects of managing engine configurations.

Other options mix items that aren’t typically standard MCC document types, or include terms that refer to time estimates or other concepts not serving as MCC artifacts, so they don’t fit as consistently with what MCC stores.