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SHOULDER HARNESS REEL
Barostat Assembly

Aviation Structural Mechanic E1&C - How airplanes are built and how to maintain them
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harness straps to retract but prevent them from extending. When in the normal unlocked state, automatic locks protect the occupant against rapid forward movement under high g-loading. PARACHUTE DEPLOYMENT ROCKET MOTOR MK 122 MOD 0.— The parachute deployment rocket motor (PDRM) (fig. 5-9) is mounted on the LH main beam of the seat. When initiated by the sequencer, restraint release unit, or manual override (MOR) system, the PDRM extracts the personnel parachute from its stowage by means of a withdrawal line attached to the deployment sleeve. The PDRM is a sealed unit. It consists of a cylindrical body that contains a gas-operated secondary cartridge in a breech at the lower end and a rocket with an integral gas-operated igniter cartridge in a barrel at the upper end. In a parallel connected chamber is an electrically initiated primary cartridge. A gas inlet is connected by a gas pipe to the harness release system. Figure 5-9.-Parachute deployment rocket motor (Mk 122 Mod 0). Fitted around the rocket is a sliding stirrup, which is connected to the parachute withdrawal line and is free to slide down the rocket as it leaves the barrel. ELECTRONIC SEQUENCER.— The NACES sequencer assembly (fig. 5-10) is composed of the sequencer, connectors to the interface with pitot static and dynamic pressure sources, and cable loom sleeving. It is mounted across the main beam assembly, below the parachute assembly. Upon activation, the sequencer determines the ejection mode and controls the functions of the drogue release, parachute deployment, and seat/man separation. BAROSTATIC RELEASE UNIT (BRU).— The barostatic release unit (fig. 5-11) provides a housing for the cartridge that provides the gas flow to initiate harness release and parachute rocket deployment. The cartridge is activated either electrically by the sequencer or by the right- hand start switch (via the delay mechanism). The cartridge incorporates an aneroid capsule to prevent mechanical initiation above a preset altitude. The cartridge may also be initiated by operation of the MOR handle after ejection. Figure 5-10.-Electronic sequencer. 5-10







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