What is the dry motoring duty cycle limit for the 2nd through 5th attempts?

The dry motoring duty cycle limit for the second through fifth attempts is specified as 30 seconds on followed by a 5-minute rest period. This timing is crucial in ensuring that the aircraft's systems do not overheat or sustain damage during engine motoring operations. Each motoring attempt generates heat, and the allowed time limits prevent excessive temperatures from building up in the engine components, which could lead to failures or decreased reliability.

In this context, the 30-second duration is specifically designed to provide enough time to evaluate the engine while allowing for a necessary cooldown period afterward. The 5-minute off time is a critical rest period that helps regulate the temperatures, ensuring safe and effective operations while the engines are being tested.

Understanding these limits is essential for pilots and technicians conducting dry motoring procedures, as adherence to these duty cycles is vital for the maintenance of engine health and the safety of flight operations.