Final answer:
The third class medical certificate issued to the 19-year old pilot on August 10, this year, would expire at midnight on September 1 this year.
Step-by-step explanation:
The third class medical certificate issued to the 19-year old pilot on August 10, this year, would expire at midnight on September 1 this year.
A third-class medical certificate issued to a pilot under the age of 40 years is valid for 5 years from the date of examination. However, for pilots under 40 years exercising the privileges of recreational or private pilot certificates, the medical certificate would expire at midnight on the 60th day after the date of examination. Therefore, in this case, since the medical certificate was issued on August 10, it would expire on September 1st of the same year.