Mk12
Ejection Seat
Over 250 Mk12s currently in service
30 lives saved using a Mk12 ejection seat
Mk12
Ejection Seat
Over 250 Mk12s currently in service
30 lives saved using a Mk12 ejection seat
Mk12 Ejection Seat
Martin-Baker developed the Mk12 seat to provide a cost-effective escape system with an improved low-speed and adverse attitude recovery capability.
The Mk12 seat introduced a significant improvement in seat performance over the speed range of zero to 625 knots and from ground level to the service ceiling of the aircraft. The seat has the capability of sensing airspeed and adjusting its mode of operation accordingly.
The Mk12 is currently operational in Taiwan in the F-CK-1 Ching-Kuo aircraft.
New Seat Installations & Retrofits
Looking to install a new seat into your aircraft? Let us help you find your perfect solution – check out our New Seat Installations & Retrofits page for more information.
Mk12 Ejection Seat
- Operating Ceiling: 50 000ft (15,250m)
- Minimum height/Speed: Zero/zero in near level attitude
- Crew boarding mass range: 71.4 to 116.0 kg
- Crew size range: As defined in Survey of 2000 Royal Air Force Aircrew 1970/1971
- Maximum Speed for ejection: 600 KIAS
- Parachute type: GQ Automatic Inflation Modulation (AIM) aeroconical
- Parachute deployment: Drogue assisted
- Drogue parachute: 1.5 m Primary and 1.7 m Secondary
- Drogue deployment: Gas-initiated parachute deployment unit
- Harness type: Combined
- Ejection seat operation type: Ejection gun and multi-tube rocket pack
- Ejection gun: Single, two stage cartridges
- Ejection initiation: Handle on seat bucket initiates gas-operated seat firing system
- Multi-mode selector: Yes, mechanical with pitot and deceleration sensors
- Barostatic time-release unit: Yes + g-restrictor. Gas initiated
- Automatic back-up unit: No
- Manual override handle: Yes
- Timers: Yes
- Seat adjustment: Up/down Actuator operated 28 Vdc
- Arm restraints: No
- Leg restraints: Yes, two garters
- Oxygen supply: Bottled emergency oxygen, Onboard oxygen generating system connection
- Personal survival pack: Yes + Automatic Deployment and Liferaft inflation
- NBC: Nuclear Biological and Chemical (NBC) ventilator
- Aircrew services: Personal equipment connector (PEC) provides connections for oxygen (main and emergency), anti-g suit and mic/tel
- Command ejection: No
- Canopy jettison: No
- Miniature detonating cord: Yes
- Interseat sequencing system: No
Mk12 Ejection Seat
Featured in:
- F-CK-1
- AIDC
- Harrier
Mk12 Ejection Seat
- Seat firing handle pulled, causing seat initiation twin cartridges to fire
- Night vision goggles separation initiated
- Miniature detonating cord trip initiates canopy fracturing system
- Harness retraction unit operated
- Gas-operated sears withdrawn from Parachute Deployment Unit (PDU) rocket and Barostatic Time-Release Unit (BTRU)
- Primary cartridge fired causing inner and intermediate pistons to rise, releasing top latch
- Secondary cartridges fire in turn as seat rises
- Seat electrical supply and onboard oxygen supply hose disconnected
- Emergency oxygen trips
- Personal equipment connector aircraft portion removed from seat portion by static line to disconnect anti-g suit hose and mic/tel connections
- Leg restraint lines draw back and restrain aircrew’s legs
- Leg restraint lines become taut and rivets shear, freeing lines from floor brackets
- Pitot heads operated by static lines
- Mode selector g-switch operated by static line
- Remote rocket initiator operated by static line, cartridge fires to ignite rocket pack
- Rocket pack sustains upward thrust of ejection gun
- PDU rocket fires 0.3 seconds after ejection to remove parachute container lid and deploy drogues to stabilise and decrease velocity of seat
Low speed AND low altitude
- Gas from PDU fires mechanical mode selector cartridge to operate BTRU in 0.3 seconds,
- Free drogue shackle link and release parachute mechanical lock
- Gas from BTRU cartridge used to 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
High speed OR high altitude
- Mechanical mode selector inhibited
- Barostatic capsule and g-switch operate to prevent parachute deployment above pre-determined altitude and speed
- BTRU completes run below pre-determined altitude and speed to fire cartridge in 1.1 seconds
- Gas from BTRU 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
- Manual separation (override) used if automatic PDU/BTRU system fails
- Secondary drogue 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
- Pulling survival pack from seat causes automatic deployment unit to operate which lowers survival pack on drop line below aircrew
- Manual deployment used if automatic system fails
- Normal parachute descent follows
- On immersion in water, automatic liferaft inflation unit operates to inflate liferaft
Gallery
Mk12 Ejection Seat
Martin-Baker developed the Mk12 seat to provide a cost-effective escape system with an improved low-speed and adverse attitude recovery capability.
The Mk12 seat introduced a significant improvement in seat performance over the speed range of zero to 625 knots and from ground level to the service ceiling of the aircraft. The seat has the capability of sensing airspeed and adjusting its mode of operation accordingly.
The Mk12 is currently operational in Taiwan in the F-CK-1 Ching-Kuo aircraft.
New Seat Installations & Retrofits
Looking to install a new seat into your aircraft? Let us help you find your perfect solution – check out our New Seat Installations & Retrofits page for more information.
Mk12 Ejection Seat
- Operating Ceiling: 50 000ft (15,250m)
- Minimum height/Speed: Zero/zero in near level attitude
- Crew boarding mass range: 71.4 to 116.0 kg
- Crew size range: As defined in Survey of 2000 Royal Air Force Aircrew 1970/1971
- Maximum Speed for ejection: 600 KIAS
- Parachute type: GQ Automatic Inflation Modulation (AIM) aeroconical
- Parachute deployment: Drogue assisted
- Drogue parachute: 1.5 m Primary and 1.7 m Secondary
- Drogue deployment: Gas-initiated parachute deployment unit
- Harness type: Combined
- Ejection seat operation type: Ejection gun and multi-tube rocket pack
- Ejection gun: Single, two stage cartridges
- Ejection initiation: Handle on seat bucket initiates gas-operated seat firing system
- Multi-mode selector: Yes, mechanical with pitot and deceleration sensors
- Barostatic time-release unit: Yes + g-restrictor. Gas initiated
- Automatic back-up unit: No
- Manual override handle: Yes
- Timers: Yes
- Seat adjustment: Up/down Actuator operated 28 Vdc
- Arm restraints: No
- Leg restraints: Yes, two garters
- Oxygen supply: Bottled emergency oxygen, Onboard oxygen generating system connection
- Personal survival pack: Yes + Automatic Deployment and Liferaft inflation
- NBC: Nuclear Biological and Chemical (NBC) ventilator
- Aircrew services: Personal equipment connector (PEC) provides connections for oxygen (main and emergency), anti-g suit and mic/tel
- Command ejection: No
- Canopy jettison: No
- Miniature detonating cord: Yes
- Interseat sequencing system: No
Mk12 Ejection Seat
Featured in:
- F-CK-1
- AIDC
- Harrier
Mk12 Ejection Seat
- Seat firing handle pulled, causing seat initiation twin cartridges to fire
- Night vision goggles separation initiated
- Miniature detonating cord trip initiates canopy fracturing system
- Harness retraction unit operated
- Gas-operated sears withdrawn from Parachute Deployment Unit (PDU) rocket and Barostatic Time-Release Unit (BTRU)
- Primary cartridge fired causing inner and intermediate pistons to rise, releasing top latch
- Secondary cartridges fire in turn as seat rises
- Seat electrical supply and onboard oxygen supply hose disconnected
- Emergency oxygen trips
- Personal equipment connector aircraft portion removed from seat portion by static line to disconnect anti-g suit hose and mic/tel connections
- Leg restraint lines draw back and restrain aircrew’s legs
- Leg restraint lines become taut and rivets shear, freeing lines from floor brackets
- Pitot heads operated by static lines
- Mode selector g-switch operated by static line
- Remote rocket initiator operated by static line, cartridge fires to ignite rocket pack
- Rocket pack sustains upward thrust of ejection gun
- PDU rocket fires 0.3 seconds after ejection to remove parachute container lid and deploy drogues to stabilise and decrease velocity of seat
Low speed AND low altitude
- Gas from PDU fires mechanical mode selector cartridge to operate BTRU in 0.3 seconds,
- Free drogue shackle link and release parachute mechanical lock
- Gas from BTRU cartridge used to 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
High speed OR high altitude
- Mechanical mode selector inhibited
- Barostatic capsule and g-switch operate to prevent parachute deployment above pre-determined altitude and speed
- BTRU completes run below pre-determined altitude and speed to fire cartridge in 1.1 seconds
- Gas from BTRU 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
- Manual separation (override) used if automatic PDU/BTRU system fails
- Secondary drogue 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
- Pulling survival pack from seat causes automatic deployment unit to operate which lowers survival pack on drop line below aircrew
- Manual deployment used if automatic system fails
- Normal parachute descent follows
- On immersion in water, automatic liferaft inflation unit operates to inflate liferaft