BASE ASSEMBLY

TM 11-6625-3081-23 1-11. DESCRIPTION OF ELECTRO-OPTICAL TEST BENCH SET (cont) 1-11 The electro-optical test bench set consists of a base assembly, a pneumatic system and three test benches; the dayside test bench, test console test bench, and nightside test bench. The base assembly and pneumatic system are described in a and b below and the three test benches are described in paragraphs 1-12, 1-13, and 1-14. a. BASE ASSEMBLY The base assembly consists of a machined steel casting on which the dayside, test console, and nightside test benches are mounted. Physical dimensions are listed below. On the underside of the base, at each of four corners, a pivot plate socket is fastened. The pivot plate socket rests on the pivot plate mounted in the van floor. These are the hard points the E/O bench assembly rests on when the pneumatic isolation system is not in use. Also located on the underside of the base are four cavities where the pneumatic piston plates contact. This occurs when the pneumatic isolation system is activated. Excessive movement of the E/O bench is limited by four studs protruding from the base through holes in the transport retainer brackets. Around the edge of the base, stiff vinyl protective skirts are fastened. These skirts prevent the operator and maintenance personnel from placing feet or hands under the base while the pneumatic isolation system is in operation. Holes are provided in the side skirts to access isolator adjusting arms. A hole is provided in the base where pneumatic tubing passes from the pneumatic control panel through to the isolator assemblies. During transport the E/O bench is secured by the transport retainer brackets. These brackets are bolted to the E/O bench and the mounting plates in the van floor. During operation the transport retainers are bolted only to the floor and are spaced approximately 0.5 inch from the bench. Physical Dimensions: Length: 96,0 in Width: 48.0 in Height: 3.4 in 1-31