What It Evaluates

Select the category that matches the equipment’s installation location, temperature control, pressurization, and maximum aircraft altitude. Categories A–F establish the applicable temperature and altitude conditions, while the numbered subcategories identify the specific thermal environment. Categories V, W, P, Y, and Z separately define the required in-flight loss-of-cooling duration.

When It Applies

Applicability depends on the airborne equipment installation, declared category, aircraft environment, and program requirements.

Likely Procedures

Typical Ranges / Conditioning