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 lefthand.

Manifold Assembly Right-Hand.- The righthand (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.

The lower face of the RH ballistic manifold (fig. 5-16) has four connectors. Two of these connectors accommodate the RH seat initiation trombone tube (outboard) and the harness locks to release the trombone tube (inboard). The connections are secured by a key-operated, quickrelease pin that passes through a hole in the manifold and cutouts in the trombone tubes. The other two connectors accommodate the gas pipe from the barostatic release unit and the gas pipe to the lower drogue bridle release mechanisms.

Manifold Assembly Left-Hand.- The lefthand (LH) assembly is a gas distribution center that is connected to the seat bucket trombone tubes and houses a seat rocket initiation system check valve. The assembly also provides a mounting for a delay cartridge.

The upper face of the LH ballistic manifold (fig. 5-17) has three socket connectors, to which are connected a flexible hose to the LH pitot deployment mechanism, a rigid pipe from the RH multipurpose initiator, and a delay initiator.

The lower face of the LH ballistic manifold has three socket connectors. Two of these connectors accommodate the LH seat initiation trombone tube (outboard) and the underseat rocket motor trombone tube (inboard). The other connector accommodates a gas pipe to the thermal batteries. A bracket on the front face of the manifold accommodates the shoulder harness control mechanism torque shaft. A connection on the aft face accepts a gas pipe from the LH multipurpose initiator.

THERMAL BATTERIES.- Two thermal batteries (fig. 5-18) supplying power for sequencer operation are mounted together in a manifold on the LH main beam.