What It Evaluates

Use the equipment’s declared low and high operating temperatures at ambient pressure. Complete at least two cycles and control humidity to prevent condensation; Categories S1 and S2 are conducted separately from other temperature tests.

Equipment Categories:

• Category A: External or internal equipment; 10°C/min minimum.
• Category B: Uncontrolled or partially controlled internal areas; 5°C/min minimum.
• Category C: Temperature-controlled internal areas; 2°C/min minimum.
• Category S1: Known temperature-change rate greater than 10°C/min.
• Category S2: Unknown temperature-change rate greater than 10°C/min.

When It Applies

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

Likely Procedures

Typical Ranges / Conditioning