*Question T1D05:
[97.113(a)(3)(ii)] When may amateur radio operators use their stations to notify other amateurs of the availability of equipment for sale or trade?*  

*Correct Answer is  D: When selling amateur radio equipment and not on a regular basis*  

### AI Response: (may contain errors)  

The correct answer to the question about when amateur radio operators may use their stations to notify others of equipment for sale or trade is:

**Correct Answer: D: When selling amateur radio equipment and not on a regular basis.**

### Explanation of the Correct Answer:
- Amateur radio operators are allowed to use their stations to notify other amateurs about the sale or trade of equipment as long as it is not done on a regular basis. This means that occasional sales are permissible, but operating a business or frequently selling equipment is not allowed under amateur radio regulations.

### Why the Other Choices are Incorrect:
- **A: Never**  
  This choice is incorrect because amateur operators are allowed to notify others about equipment sales, provided they follow the regulations regarding frequency and frequency of sales.

- **B: When the equipment is not the personal property of either the station licensee, or the control operator, or their close relatives**  
  This choice is incorrect because it misinterprets the rules. Operators can sell their personal equipment, but they must not do so regularly.

- **C: When no profit is made on the sale**  
  This choice is misleading. While it is true that amateur radio operators should not operate for profit, the key point is that they can sell equipment occasionally, regardless of whether they make a profit or not.

### Summary of Rules:
- Amateur radio operators can notify others about equipment for sale as long as:
  - It is not done on a regular basis.
  - The equipment can be personal property.

This understanding is crucial for compliance with amateur radio regulations while engaging in equipment sales.