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The proper document to determine if the correct magnetos are installed in an aircraft reciprocating engine is the Aircraft Engine Specifications. This document provides detailed information about the engine and its components, including specifications for magnetos, intended to ensure compatibility and compliance with the manufacturer's standards. By referring to this document, one can confirm that the installed magnetos meet the required specifications for that particular engine model, which is crucial for ensuring safe and efficient engine operation.

Other documents, while relevant to various aspects of aircraft operation or maintenance, do not specifically address the detailed specifications regarding magnetos. The Aircraft Engine Maintenance Manual may contain maintenance procedures but does not typically list specifications for proper magneto installation, while the Aircraft Operating Handbook provides operational guidelines rather than technical specifications. Type Certificate Data Sheets provide certification information about the aircraft and its components but are less focused on engine-specific details than the Aircraft Engine Specifications.