Which manual takes precedence for avionics equipment when the Aeronautical Engineering Maintenance Manual and the Coast Guard Electronics Manual differ?

• A. Coast Guard Electronics Manual
• B. Integrated Logistics Support Plan
• C. ACMS
• D. Aeronautical Engineering Maintenance Manual

Answer: (D)

When two official manuals conflict, the document that provides the aircraft’s engineering maintenance data takes precedence. The Aeronautical Engineering Maintenance Manual contains the approved procedures, configurations, and engineering data for the aircraft’s systems, including avionics, and serves as the controlling reference for maintenance, installation, testing, and inspection. If there’s a discrepancy with the Coast Guard Electronics Manual, the AEMM governs because it embodies the airworthiness and engineering standards for the aircraft. The Coast Guard Electronics Manual is a specialized reference for electronics but must align with and not override the engineering maintenance data in the AEMM. The other options describe support plans or systems rather than the authoritative maintenance data, so they do not govern precedence.