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Pitot assembly, right-hand.
Manifold Assembly Left-Hand

Aviation Structural Mechanic E1&C - How airplanes are built and how to maintain them
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an escapement. The gear train consists of a primary spur and pinion, a secondary spur and pinion, an idler wheel, an escapement wheel and an escapement rocker. The rack assembly consists of a rack end screwed into a slotted end. The two components are secured together with a locking screw. The upper end of the rack end is shaped to form a firing pin. To retain the rack in the cocked position, one face of a pawl in the bottom housing engages in the slotted end of the rack assembly. Another face of the pawl engages in a groove in a gas-operated Figure 5-15.-Pitot assembly, operation. piston installed in a housing attached to the lower part of the unit body. The piston is retained in position by a frangible disc. PITOT ASSEMBLIES— Two pitot assemblies (figs. 5-14 and 5-15) incorporating deployable pitot heads are mounted on the main beams behind the parachute container. Removable covers are provided to prevent entry of foreign bodies, The pitot heads are maintained in the stowed position by locking mechanisms that are released during seat ejection, as the seat separates from the catapult, by gas pressure from the multipurpose initiator cartridges. When deployed, the pitot head assemblies supply dynamic pressure inputs to the electronic sequencer. Static (base) pressure is supplied to the sequencer from the voids within the LH and RH main beams. Each pitot assembly comprises a body, drilled and plugged to form a series of gas passages, and two cylinders containing upper and lower pistons. A deployable pitot arm incorporating a pitot head is attached to the aft face of a bracket, forming part of the body. Attached to the forward face of the bracket is a pitot connector that is connected to the pitot head. A spring-loaded locking plunger, which locates in one of two holes in the body, is installed inside the lower end of the pitot arm. The locking plunger locks the pitot arm in the stowed or deployed positions. A separate passage in the body, incorporating connectors at each end and a filter, forms part of the static pressure supply system for the sequencer. BALLISTIC MANIFOLDS.— There are two ballistic manifold assemblies-right-hand and left- hand. Manifold Assembly Right-Hand.— The right- hand (RH) assembly is a gas distribution center that is connected to the seat bucket trombone tubes and incorporates the upper harness release piston, the ejection gas line quick disconnect, and a housing for the bridle release cartridge. The assembly also provides a mounting for a delay cartridge. The drogue bridle release impulse cartridge is installed in a threaded housing on the upper face. The upper harness release piston protrudes from the manifold upper face. 5-15







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