DS EN 2997-009:2010 Aerospace Series - Connectors, Electrical, Circular, Coupled By Threaded Ring, Fire-Resistant Or Non Fire-Resistant, Operating Temperatures -65 Degrees C To 175 Degrees C Continuous, 200 Degrees C Continuous, 260 Degrees C Peak - Part 009: Protective Cover For Receptacle - Product Standard Defines the characteristics of protective covers for receptacles in the family of circular electrical connectors coupled by threaded ring.