Final answer:
The only heat gun authorized for use around fueled aircraft would be one that meets strict aviation safety guidelines to prevent ignition risks, and for the specific model, aviation safety regulations or maintenance guidelines should be consulted.
Step-by-step explanation:
The only heat gun presently authorized around fueled aircraft is likely one that has been specifically designed for safety and approved by aviation authorities. This would include features to prevent ignition sources and to ensure the heat gun does not emit sparks or high temperatures that could pose a risk around fuel vapors. For an accurate answer, you would need to consult the latest aviation safety regulations or maintenance guidelines from aircraft manufacturers and regulatory bodies such as the Federal Aviation Administration (FAA) or the European Union Aviation Safety Agency (EASA). These agencies provide detailed protocols for tools and equipment used in the vicinity of aircraft to ensure safety is maintained at all times.