Strana 18
The order of switching from on-board systems with respect to altitude and speed
1. Ejection during take-off or landing and speeds ≥ 130 km/h and ejection during flight at speeds < 500 km/h and flight altitude < 3000 m.
a: by pulling on the dual ejection handles, the pilot ensures:
- securing the pilot to the seat backrest,
- extension of the arm restraints,
- jettisoning of the cockpit canopy,
- unlocking of the 1st stage of the KSM unit,
- actual operation of the 1st stage of the KSM unit,
- ejection of the first stabilizer parachute rod into the air stream.
b: Seat movement along the guide rails.
When the seat moves up the guide rails, the following occurs:
- the KPA-4 is initiated and the elastic pin is pulled out of the PPK
-
U
-
T-227 device and it is launched,
- ORK-11A connection is severed
- the rod of the first stabilizing parachute is extended (immediately, the KPA-4 switches without delay, since speed is ≤ 500 km/h)
- the arm restraints are extended,
- the elastic pin is pulled out and the PPK-1M time delay is triggered (delay of 1.5 s),
- the second stabilizing parachute is pulled out into the air stream,
- the pilot’s legs are secured by the leg restraint system,
- the PV-50 explosive chrge is initiated and the PZ
-
M powder charge is ignited in the second KSM stage,
- disconnection of the ejection mechanism and a transition of the seat to a stabilized descent.
c: Stabilized seat descent
During the stabilized descent phase, the time delay of the PPK-1M automatic device kicks in and:
- release of the pilot's leg restraints,
- release of the ejection handles from the seat,
- unlocking of the pilot's securing locks,
- folding of the headrest,
- separation of the second stabilizing parachute, which pulls the cover off the pilot's main parachute,
- separation of the pilot from the seat, release of the NAZ-7(M) emergency survival pack and deployment of the pilot's main parachute,
- descent of the pilot on the main parachute, while the seat falls separately.
2. Ejection at flight speeds of 500 – 1200 km/h and an altitude of < 3000 m.
a: By pulling up on the ejection handles, the pilot ensures that:
- securing of the pilot to the seat back,
- extension of the arm restraints,
- jettisoning of the cockpit canopy,
- unlocking of the first stage of the KSM unit,
- actual operation of the first stage of the KSM unit,
- extension of the first stabilizer parachute rod into the air stream.
b: Seat movement along the guide rails.
As the seat moves along the guide rails, the following occurs:
- the KPA-4 is initiated and the elastic pin is pulled out of the PPK
-
U
-
T-227 device and it is launched,
- ORK-11A and MP-150D connections are severed,
- the pilot’s legs are secured by the leg restraint system,
- PV-50 explosive charge is detonated and the PZ
-
M powder charge is ignited in the second stage of the KSM,
- the ejection mechanism is disconnected and the seat moves into a stabilized descent phase.
c: Stabilized descent
During the stabilized descent phase, the following occurs:
- processing of the KPA – 4 time delay in 0 – 1.6 s
- release of the pilot’s leg restraints,
- insertion of the hand throw limiters,
- firing of the 1st stabilizing parachute rod,
- triggering of the PPK – 1M time automaton,
- pulling out the 2nd stabilizing parachute into the air stream,
- release of the pilot’s leg restraints,
- release of the DOR from the seat,
- unlocking of the pilot’s fixation locking locks,
- folding of the headrest,
- separation of the 2nd stabilizing parachute, which pulls the cover off the pilot’s main parachute,
TECHNICS / EQUIPMENT
INFO Eduard18
August 2025