Final answer:
Operational checks after a 100-hour inspection of a reciprocating engine include starting the engine, checking for anomalies, verifying control linkages, performing a mag check, inspecting the carburetor heat, checking for fuel and oil leaks, and ensuring instrument readings are within normal ranges.
Step-by-step explanation:
Before returning a reciprocating engine to service after a 100-hour inspection, several operational checks must be performed to ensure the engine and related systems are functioning correctly. The checks should include: starting the engine and checking for abnormal noises or vibrations; verifying that the control linkages are properly connected and operating smoothly; ensuring the magnetos are functioning correctly by performing a mag check, which involves running the engine and switching off each magneto in turn to observe any drop in RPM; checking the carburetor heat for proper operation; inspecting the fuel and oil systems for leaks; and ensuring all instruments are operating within their specified ranges during a run-up at various power settings. Finally, a test flight may be conducted to observe the engine performance under typical operating conditions, checking for any powerplant anomalies or deviations from expected performance.