How should 10,500 feet MSL be correctly stated to ATC?

In aviation communications, it's important to convey altitudes in a clear and standardized format to ensure understanding and safety. The correct way to state "10,500 feet MSL" to Air Traffic Control (ATC) is "One zero thousand five hundred." This format breaks down the number into clear components, reducing the chance of miscommunication.

Using "one zero" for "10" ensures that ATC understands you are referencing a number that is more than a single thousand, avoiding any confusion that could arise from simply saying "ten." While "ten thousand five hundred" is a commonly used phrase, it does not follow the numerical breakdown preferred in aviation communication, which uses the phonetic alphabet and numbers for clarity and to accommodate potential language barriers or poor radio transmissions.

In contrast, other options such as "one thousand five hundred" and "ten five hundred" either misinterpret the actual altitude or do not adhere to the concise communication style that is essential in radio communications. Clear and precise language is crucial in aviation to maintain safety and ensure that messages are understood without ambiguity.