Advise Fly-Three talker at the deckedge control station that ENGINES ARE SET or ENGINES NOT SET. NOTE Weight selector push-button controls on the Pri-Fly panel are for emergency resets only. DECKEDGE CONTROL STATION The Mk 7 recovery equipment controls are grouped in two areas–the engine room and the deckedge station. The deckedge control station is located on the starboard side aft, where the operator has a clear, unobstructed view of the landing area. The deckedge control station is equipped with control levers to retract each of the pendant engines and the barricade; a pressure gauge for the barricade hydraulic system; a control lever to raise or lower the barricade stanchions; push buttons to raise, lower, or stop the retractable sheaves; an indicator light to indicate their position; a battery position indicator light for the damper sheaves; and synchro receivers to monitor settings on the aircraft weight selector unit of each engine. The deckedge control operator operates the controls from the gallery walkway and is equipped with sound-powered phones to maintain voice communications with the engine-room operator and Pri-Fly. Retracting Valve The retracting valve permits the controlled return of fluid from the accumulator to the cylinder, thereby returning the engine to the BATTERY position. The general location of the retracting valve is shown in figure 3-6. The retracting valve is a self-contained poppet-valve assembly composed principally of a housing, a plunger, an operating lever, a valve stem, and a valve seat. The retracting valve operates as a check valve against the flow of fluid from the accumulator to the engine cylinder. Fluid at accumulator pressure enters the housing and bears on the stem in the direction that would open the valve; however, the pressure also bears against the base of the plunger, which tends to close the valve. Since the area of the plunger end is greater than that of the stem, the differential in force keeps the valve closed. The retracting valve has piping that provides passage for engine fluid flow from the arresting engine, by way of the retracting valve, to the cable anchor dampers. A discharge port is provided where the retracting valve and pressure valve body are bolted together to allow fluid flow from the accumulator or fluid cooler into the main engine cylinder during retraction. RETRACTING VALVE BODY.–The retracting valve body is a hollow steel casting with an inlet port, connected by piping to the engine accumulator/fluid cooler manifold, a discharge port that is flanged and bolted to the engine cylinder outlet elbow, and a port connected by piping to the cable anchor dampers. The valve body is bored and machined smooth inside to receive the valve seat. O-rings are provided as a seal between the valve body and the seat. The lower portion of the valve body has an inside machined recess for insertion of a V-ring packing assembly. The V-ring packing prevents leakage between the stem and valve body. VALVE SEAT.—The valve seat is a hollow, machined, cylindrical piece of bronze. One end is flanged and is bolted to the valve body, and the opposite end is machined to form a mating surface (seat) for the valve stem. Four vertical elongated holes are machined in the seat to allow fluid to enter the valve from the accumulator. VALVE STEM.—The valve stem is a round piece of machined steel with a shoulder machined midway between the top and bottom. This shoulder mates with the valve seat and blocks fluid flow through the retract valve during arrestment and from the accumulator to the engine cylinder until retraction is desired. PLUNGER.–The plunger is a round piece of machined steel that is blind bored at one end to receive the shank of the valve stem. The plunger and valve stem are connected by a dowel pin. The opposite end of the plunger has a machined clevis and is externally threaded just below the clevis. The 3-10