Why is it important to dry motor until the starter time limit after a No Light Off?

Dry motoring after a No Light Off is crucial primarily for two reasons: preventing starter overheating and clearing residual fuel that may have accumulated in the combustion chamber.

When the engine fails to start (No Light Off), the starter continues to operate, and the potential for overheating becomes significant if the motor engages for too long without the engine igniting. By adhering to the dry motor procedure and timing limits, you are allowing the starter to cool down and avoid damage from prolonged usage without a successful engine start.

Additionally, during the dry motor period, any residual fuel that has not ignited can be cleared from the combustion chamber. This action helps to prepare the engine for a subsequent start attempt, reducing the risk of further No Light Off situations due to flooded conditions.

The other options do not accurately address the primary concerns involved in the dry motor procedure. For instance, while increasing engine RPMs is related to engine operation, it is not a goal of dry motoring. Similarly, battery efficiency and cockpit temperature do not directly correlate with the necessity of following the dry motor protocol during a No Light Off scenario.