When is the medical certificate for FEX obtained on August 25, 2010 valid until?

The medical certificate for flight engineers typically has a specific validity period, which is commonly stated in regulations. In this case, a medical certificate obtained on August 25, 2010, would usually be valid for a period that extends to the end of the 12 months following the date of issuance. Therefore, if the certificate was issued on August 25, 2010, it would remain valid until August 31, 2011.

This is based on the standard practice for such certifications, which often mandate an annual renewal depending on the medical class of the certificate and the specific regulations governing flight engineers. The date given for validity concludes at the end of the month after the 12-month period, making August 31, 2011, the correct expiration date. Other dates provided do not align with the one-year validity rule frequently applied to medical certificates in aviation, which eliminates them as possible answers.