Downloaded from https://www.everyspec.com MIL-STD-810D 19 July i983 ~ c. Increases footing hazard. d. Interferes with clearances between moving parts. e. Induces structural failures. I f. Reduces airflow efficiency. ~ g. Impedes visibility thrcugh windshields and optical devices. I h. Affects tranamiasion of electromagnetic radiation.. I i. Leada to increased probability cf damage to equipment from the employment of mechanical, manual, or chemical ice removal,measures. NOTE: This test method should be applied at the end of the tailoring process described in section b of this standard. a.
This method,is applicable to materiel which may be exposed to icing or freezing rain conditions during normal use. b. ~. This method does not simulate snow conditions, nor I dces it simulate ice buildup on aircraft flying through supercooled clouds. c. SQ9MQUQ (See General Requirements, 4.4.Q.) The possibility of structural damage to the test materiel due to the icing test should be considered when determining test sequence. This test should follow the rain tests (method 506.2) and precede the salt fog tests (method 509.2) and mechanical teats (such,ae 513.3 through 519.3) so that parts will net be 1 locsened before the icing teets. I d. l!!= t vaCi&iQm.
The freezing rain teet contains cne test procedure I that is applicable for most equipment. All test variables should be specified I in the test plan before actual testing is initiated. 1-3.1 Q@ce of test a. Test oble~. This method is designed materiel and ancillary equipment (mounted so that it environment) can operate after ice accumulation from to determine if the is directly exposed rain, drizzle, fog, to the SDlaSh, or other sources. Where ice removal ia required before operation, the .x u~e’cf’the integral deicing equipment or expedients normally available to the I operator in the field will be employed.
Deicing equipment and expedients will be evaluated to ‘assesstheir effectiveness and the potential for damage that may degrade performance. * b. ~St Droced~. When an icing test iA deemed necessary, the procedure included in this method is considered suitable for most test items. Since natural icing conditions will be the samefor all materiel located METHOD 521.0 19 July 1983 521.0-2