Strana 16
The function of this system is described in a simplified manner in Point 8, and a PK-3 M1 type explosive charge is used in its operation.
The KP-27M parachute oxygen device is designed to ensure the pilot's vital functions after ejection at high altitudes, for descent to a safe height
or, in the event of a failure of the on-board system, supplying oxygen to the pilot. The device is located in the seat frame and consists of thirteen
cylinders with a total volume of 0.825 l, filled to a pressure of 15 Mpa.
The electrical system’s main component is
the ORK-11A quick-connector, which is lo-
cated on the seat frame. Its function is to
simultaneously automatically disconnect all
connections of the onboard equipment that
are supplied to the pilot and to automatically
switch the power supply from the onboard
oxygen system to the KP-27M parachute
oxygen device. When the seat is ejected, the
lower ORK-11A head with hoses and a cable
for radio and electrical equipment remains
on board the aircraft. The upper part, with
the hose assemblies and KP-27M, is fired
together with the seat and the pilot. Return
valves are installed in the upper head no-
zzles, which close the oxygen installation
circuit from KP-27M to prevent oxygen from
escaping from the seat installation into the
atmosphere.
This is made up of the following subsystems:
The parachute telescopic mechanism is part of the KSM design and its function is to extend the first stabilizing parachute into the air stream. When
the KSM is activated, part of the gases from the PK-16M explosive charge are directed to the parachute mechanism, the tubes of which are extended
and form a rod that is connected to the KSM using a telescopic principle.
The first stabilizing parachute is connected to the parachute telescopic mechanism on a freely rotating joint and serves to stabilize the seat along
its initial movement path after launch and also serves to reduce the speed of the seat. The second stabilizing parachute also initiates its function
at this time.
The second stabilizing chute is designed to stabilize the seat during ejection at altitudes greater than 3000 m, and also slows the seat to a speed
suitable for deploying the main rescue parachute.
There is a system in place that extends the telescopic tubes from the KSM mechanism forming a rod with a 3m tether, which ensures that the ca-
nopy of the first stabilizing parachute does not obscure the space that would be occupied by the seat.
The KPA-4 automatic device ensures the deployment of the first stabilizing parachute with telescopic tubes of the launch rod using the PK-3 M1
explosive charge. The KPA-4 automatic device is unlocked by the movement of the seat during ejection, because its unlocking mechanism is atta-
ched to the console of the inner cylinder. At the moment of ejection, the seat records and evaluates the aircraft speed v₁ in the range of 130 to 1200
km/h. and depending on this speed, with a delay of 0 to 1.6 s, the first stabilizing parachute is deployed and at the same time the second stabilizing
parachute is opened.
10. Canopy Jettison System
12. The Seat Oxygen System
13. The Seat Electrical System
11. Seat Stabilization System
ORK-11A Quick Connector Detail
KP-27M Oxygen Device connector with radio connection cable. KM-1M Ejection Seat Operation
TECHNICS / EQUIPMENT
INFO Eduard16
August 2025