What is a procedural method to separate fixed and rotary-winged aircraft, designating an altitude above which fixed-wing aircraft will normally fly and below which rotary-wing aircraft will normally fly?

• A. Coordinating altitude
• B. Fire Support Coordination Line
• C. IFF On/IFF Off
• D. PID On

Answer: (A)

Coordinating altitude is a deconfliction method used to separate fixed-wing and rotary-wing aircraft by altitude. By designating an altitude above which fixed-wing aircraft normally fly and below which rotary-wing aircraft normally operate, planners and aircrews can operate in the same airspace with reduced risk of mid-air conflicts and clearer sequencing during missions such as close air support and helicopter insert/extracts.

This is the best answer because it directly establishes the vertical boundary that differentiates how the two aircraft types will typically use the airspace. The other options relate to different concepts: a Fire Support Coordination Line defines boundaries for fire support, IFF On/IFF Off concerns identification of friend or foe, and PID On relates to another control function not about aircraft separation.