installed in the key switch on the remote araing box. It is operated ta clase the circuit to the fire relay after it is Jeterzizned that the safe loop on the Temote arming bax indicates that the EG&G tiaing relay is open. indicates that the key switch is operating. A ready Leap Closure of the ECAC tiaing relay will fire the carriers. 8.2.3 Handling Equipment The following six items of specislized handling equipeent are required: (1) A castered assembly dolly which bolds the engine while the oose and tail assemblies on the interstage adapter are attached. (2) A strongback for lifting che engine uit from its shipping ccntrainer onto the assembly dolly. , (3) A sose-assecbly stazd co facilitata assembly and checkout of the oie. (b) A strongback assembly for lifting the nose assexbly and holding it in positica fcr attachment to the reste of the vehicle. (5) A strongback for handling the midsection. (although this sectica is relatively small and is noreally handled by band, when fully ballasted for the 40,000-foot station, it weighs several hundred pounds.) (6) A strongback for loading the assezbled webicles on the launcher. This equipment has che capability of picking up the wehicle frou a horizontal posi- tion and rotating it to a near-vertical position for loading onto the Launcher. The bandling equipment is used in conjumction with any commercial crane with a boom of approximate 30-foot length and 5000-pound capacity. All assembly, with the exception of installation of the spin rockets, is dom on the ground before installation on the launcher. In the assembly of the two-stage vehicles, the assembled booster is loaded onto the lancher, and the assembled second stage is then placed on top of the booster. For safety reasons, the spin rock- ets are not installed until both stages bave been loaded onto the launcher. 8.2.4 Test Equipoent A PT-SO tester is used in the laboratory to hi-pot and check conrisuity of all circuits im the tisver junction box and all cables. In the field a tiser tester is used to check tiver setting, reset tisers, and siculraneously Dy