What is the correct way to indicate altitude restrictions on a strip?

Indicating altitude restrictions on a flight strip is crucial for ensuring safe separation and clear communication among air traffic controllers. The correct approach is to include the lowest altitude first. This method allows controllers to quickly understand the minimum altitude that an aircraft must maintain, facilitating timely adjustments to air traffic flow.

When the lowest altitude is listed first, it establishes a clear baseline for all subsequent altitude instructions and helps avoid misinterpretation during busy operations. This practice also aligns with standard operating procedures in air traffic control, where clarity and precision are paramount for safe and efficient management of airspace.

Alternative methods, such as listing restrictions before the aircraft type or using a numerical code, may lead to ambiguity or delays in processing important information. Similarly, specifying conditions before flight levels can complicate understanding and decision-making. Therefore, prioritizing the lowest altitude first is the most effective and widely accepted practice for indicating altitude restrictions on a strip.