Icing and Freezing Rain Testing

Freezing and Icing Rain Testing

Icing and Freezing Rain Testing Capabilities at Keystone Compliance

Icing and Freezing Rain testing is performed within any of our environmental chambers. With a drive-in chamber of 12’ wide x 15’ deep x 10’ tall, we are capable of performing icing and freezing rain tests on large test articles. Specially designed atomizing nozzles and pre-chilled water are used for the rapid formation of ice up to the prescribed thickness. With years of icing and freezing rain test experience, Keystone personnel have the knowledge to reach the desired ice thickness quickly and reduce test time and cost.

Icing and Freezing Rain Test Lab Equipment at Keystone Compliance

Keystone Compliance performs icing and freezing rain tests within any of our environmental chambers. Specially designed atomizing nozzles and water pre-chillers are used to create the formation of ice quickly and uniformly.

Icing and Freezing Rain Testing Overview

Icing and freezing rain testing, per MIL-STD 810 Method 521.2, is conducted to evaluate the effects of icing produced by a freezing rain, mist or sea spray on the operational capability of equipment. This method also provides tests for evaluating the effectiveness of de-icing equipment and techniques, including expedients.

A buildup of ice occurs in three principal ways:

  • From rain falling on an item whose temperature is below freezing
  • From freezing rain falling on an item at or near freezing
  • From sea spray which coats equipment when temperatures are below freezing

MIL-STD 810 identifies two conditions commonly encountered:

  • Clear glaze ice, which occurs when rain or drizzle freezes on objects
  • Rime ice, which occurs when fog droplets or drizzle fall on surfaces below freezing

Ice formation can create problems such as:

  • Binds moving parts together
  • Adds weight to equipment
  • Increases footing hazard
  • Interferes with clearances between moving parts
  • Induces structural failures
  • Reduces airflow efficiency
  • Impedes visibility through windows and optical devices
  • Affects transmission of electromagnetic radiation
  • Leads to increased probability of damage to equipment from the employment of mechanical, manual or chemical ice removal measures

Icing and Freezing Rain Specifications

MIL-STD 810 Method 521.2
Icing and Freezing Rain
RTCA/DO 160 Section 24.0 Icing