Final answer:
The question is incomplete, making it impossible to provide a detailed answer. It relates to cooling methods for an Inertial Navigation Unit (INU) mentioned in a technical manual and requires additional context for an accurate response.
Step-by-step explanation:
The text seems to be from a technical manual, likely related to aeronautics or similar engineering fields, and is asking for specific actions to take to provide cooling air for the INU. However, the provided question is incomplete as it does not give all the necessary blanks to fill in. The question seeks to understand what alternative cooling method can be used, which switch to adjust, the acceptable temperature limit for the cooling air, correct selector switch position, and the maximum operation time under these conditions.
Given the incomplete nature of the question asked, the missing pieces of information make it impossible to provide a detailed answer. Therefore, it is recommended to refer to the complete technical manual (TO 1E-8C-1) for accurate and detailed instructions on how to cool an INU when ground cooling is not available. Nevertheless, in practice, such procedures would involve switching to an auxiliary cooling system and monitoring the temperature to ensure it remains within safe operating limits, typically by adjusting a temperature selector switch and monitoring the maximum allowed time duration for the operation of the system.