an integral gas-operated igniter cartridge in a barrel at
Parachute Deployment Rocket Motor
the upper end. In a parallel-connected chamber is an
MK 122 MOD 0
electrically initiated primary cartridge. A gas inlet is
The parachute deployment rocket motor (PDRM)
connected by gas pipe to the harness release system.
(fig. 2-10) is mounted on the LH main beam of the seat.
The rocket incorporates a top cap with four integral
It extracts the personnel parachute from the parachute
rocket nozzles equally spaced around the perimeter.
container and enables the parachute to deploy and
Fitted around the rocket is a sliding stirrup connected to
develop rapidly without becoming entangled in the
the parachute withdrawal line that is free to slide down
seat.
the rocket as it leaves the barrel.
The PDRM is a sealed unit and consists of a
A retaining screw mounted at an angle in the body
cylindrical body containing a gas-operated secondary
bears down on the flanged base of the rocket igniter
cartridge in a breech at the lower end of a rocket, with
Figure 2-10.--Parachute deployment rocket motor MK 122 MOD 0.
2-10
