The Mk.10 seat is designed in four main units, catapult, main beam structure, seat bucket and parachute assembly. This greatly simplifies and speeds maintenance or cockpit access. The seat can be rapidly installed or removed by assembly or disassembly of the main units in the aircraft. As the aircraft canopy is not removed, valuable maintenance time is saved.The overall size footprint of the 10L seat has been tailored to suit a large number of aircraft installations. This design envelope flexibility enables the seat to be perfectly matched to any existing or future cockpit space limitations without adversely affecting the primary design operation of the seat.

 

 

 

Specifications	Mk 10 (IN10LH)
Operating ceiling	50 000+ft (15,250 m)
Minimum height/speed	Zero/zero in near level attitude
Crew boarding mass range	69.2 – 112.2 kg
Crew size range	3rd to 99th percentile, as defined in Survey of
	2000 Royal Air Force Aircrew 1970/1971
Maximum Speed for ejection	630 KIAS
Parachute type	GQ Type 1000 Mk 2
Parachute deployment	Drogue assisted
Drogue parachute type	5 ft and 22 in.
Drogue deployment	Drogue gun. Initiated by trip rod
Harness type	Integrated
Ejection seat operation type	Ejection gun and multi-tube rocket pack
Ejection gun	Single, two stage
Gun stroke length	72 in.
Ejection initiation	Handle on seat pan initiates gas operated seat
	firing system
Electronic Sequencer	No
Barostatic time-release unit	Yes + g-restrictor. Initiated by trip rod
Automatic back-up unit	No
Manual override handle	Yes
Timers	No
Seat adjustment	Up/down Actuator operated 28 Vdc
Arm restraints	No
Leg restraints	Yes, two garters
Oxygen supply	Bottled emergency oxygen
	Main oxygen system connection
Personal survival pack	Yes, landscale Liferaft option available
Aircrew services	Personal equipment connector (PEC) provides
	connections for
	- main oxygen
	- back-up oxygen
	- emergency oxygen
	- anti-g suit
	- mic/tel
Command ejection	Yes
Canopy jettison	No
Miniature detonating cord	Yes
Interseat sequencing system	Yes, through command delay breech unit

How it works

Seat firing handle pulled causing seat initiation cartridge to fire
Harness retraction unit operated, command firing initiated
Primary cartridge fired causing inner and intermediate pistons to rise, releasing top latch
Seat rises up guide rails
     - Miniature detonating cord trip initiates canopy fracturing system
     - Secondary cartridges fire in turn as seat rises
     - Electrical connections separate disconnecting seat actuator circuit, IFF
       switch and oxygen regulator supply lead
     - Aircraft portion of main oxygen generating system block separate
       disconnecting main and back-up oxygen
     - Personal equipment connector aircraft portion disconnects from seat portion
     - Anti-g suit hose disconnects
     - Leg restraint lines draw back and restrain aircrew’s legs
     - Leg restraint lines become taut and rivets shear, freeing lines from floor brackets
     - Trip rods withdraw sears from drogue gun and barostatic time-release units
     - Emergency oxygen trips
     - Remote rocket initiator operated by static line, cartridge fires to ignite rocket pack
Rocket pack sustains upward thrust of ejection gun, diverging trajectories for front and rear seats
  After delay mechanism has operated, drogue gun piston fires
Ejected piston withdraws closure pin from closure flaps of drogue parachute pack and

  deploys drogues.
Deployment of drogues stabilize and retard the seat and aircrew

Low altitude/High speed -
     - Seat descends stabilised by drogues
     - Barostatic time-release unit completes run and fire

High speed/high altitude -
     - Barostatic capsule operates to prevent parachute deployment above pre-determined altitude
     - Barostatic controlled g-switch delays parachute deployment above 7000 ft
       until speed and g-force are reduced
     - Barostatic time release unit operates below pre-determined altitude, completes run and fires

Manual separation (override) used if automatic system fails
Gas from cartridge used to
     - Free drogue shackle link
     - Release parachute mechanical lock
     - Operate upper harness locks and lower harness release mechanism to free

       lower harness lugs, negative-g straps, leg restraint lines and personal equipment

       connector man portion

Drogues withdraw parachute from container
Sticker straps momentarily hold aircrew in seat
Parachute develops, lifts aircrew and survival pack from seat and pulls sticker clips from clips

  causing aircrew and seat to diverge
Normal parachute descent follows
Aircrew releases either of two quick-release connectors to lower survival pack to end of line
Survival pack opened manually when necessary