This test method is divided into two procedures. The small-particle procedure (dust, fine sand) is performed to ascertain the ability of equipment to resist the effects of dust particles which may penetrate into cracks, crevices, and joints. The blowing sand test is performed to determine whether materiel can be stored and operated under blowing and conditions without experiencing degradation of its performance, effectiveness, reliability, and maintainability due to the abrasion (erosion) or clogging effect of large, sharp-edged particles. Examples of some problems that could occur as a result of exposure of material to blowing sand and dust are:

1. Abrasion of surfaces.

2. Penetration of seals.

3. Erosion of surfaces.

4. Degradation of electrical circuits.

5. Clogging of openings and filters.

6. Physical interference with mating parts.

7. Fouling of moving parts.

The TDS Recon is tested for 6 hours at 23 C (73° F) and 6 hours at 70 C (158° F) for Procedure I, blowing dust. It is then tested for Procedure II, blowing sand (2.2 g/m³) for 90 minutes per face, 6 faces total.