MK16 EJECTION SEAT
for T-6 Texan II
Over 1,600 US16LA ejection seats in service First US16LA ejection on 31st August 2000

The JPATS (Joint Primary Aircraft Training System) is designed to train students in basic flying skills, and is common to the U.S. Air Force and Navy. Designated the US16LA, this lightweight ejection seat is designed for training aircraft, such as the T-6 Texan II. It optimises the pilot field of view, improves comfort and pilot efficiency, and provides increased reliability and maintainability. With the Mk.16 lightweight low speed seat, ejection performance is optimised throughout the escape envelope, from zero height at zero velocity in a near level attitude through to 370 knots. It is designed to accommodate a very wide, size and weight range.

The T-6 Texan II is currently operated by 7 different countries. These include Canada, Greece, Iraq, Israel, Mexico, Morocco and USA. Since the first JPATS delivery in 1997, over 1600 seats have been delivered worldwide. A total of 11 aircrew owe their lives to the US16LA JPATS Ejection Seat.

Here's what our ejectees have to say: "I would like to extend my gratitude and appreciation of your equipment, as I personally feel that it saved my life". 2nd Lt. Francis D. K. Lessett, T-6 Texan II, US16LA ejection seat, 2nd April 2010. "Thank you so much for your outstanding work! Every person I know is thankful!", Nicholas Brumgard, T-6 Texan II, US16LA ejection seat, 24th September 2010.

Operating Ceiling 50 000ft (15,250m)
Minimum height/Speed Zero/zero in near level attitude
Crew boarding mass range 62.3 to 123.0 kg
Crew size range JPATS multi-variate body size cases 1 to 7
Maximum Speed for ejection 370 KIAS (aircraft limit 316 KIAS)
Parachute type GQ Type 5000
Parachute deployment Cartridge initiated
Drogue parachute 5 ft
Drogue deployment Cartridge initiated and deployed
Harness type Torso
Ejection seat operation type Ejection guns and underseat rocket motor
Ejection gun Twin
Ejection initiation Handle on seat bucket initiates gas operated seat firing system
Automatic back-up unit No, manual override
Electronic sequencer No
Barostatic time-release unit Yes + g-restrictor, cartridge initiated
Timers Time delays in sequencing system
Seat adjustment Up/down actuator operated 28 Vdc
Arm restraints No
Leg restraints Yes, two garters
Oxygen supply Bottled emergency oxygen
Personal survival pack (PSP) Yes + automatic deployment
Aircrew services Connection to emergency oxygen supply
Command ejection Yes, via Interseat Sequencing System (ISS)
Canopy jettison No
Canopy fracturing system Yes
Interseat Sequencing System (ISS) Yes
  • T-6 Texan II
  • Seat firing handle pulled causing seat initiation cartridge to fire
  • Interseat equencing system initiated initiated
  • Harness retraction unit operated
  • Primary cartridge fires, bottom latches engage, top latches disengage seat rises up rails
  • Canopy fracturing MDC initiated
  • Aircraft services disconnected
  • Leg restraint lines draw back and restrain aircrew’s legs
  • Secondary cartridges fire as seat rises
  • Multi-purpose initiators fire
  • Underseat rocket motor fires
  • Leg restraint lines become taut and rivets shear, freeing lines from floor brackets
  • Emergency oxygen supplied to aircrew
  • Barostatic time-release unit (BTRU) mechanism set to operate when altitude and g-load conditians are satisfactory
  • Manual override handle lock released
  • Drogue and bridle deployed, stabilise and decrease velocity of seat
  • Barostatic time release unit (BTRU) monitors the altitude and g-load conditions

Above 15 000 ft

  • Seat falls, stabilised by drogue
  • Emergency oxygen supply continues

Below 15 000 ft but above 8000 ft

  • Seat falls, stabilised by drogue
  • Emergency oxygen supply continues
  • G-restrictor prevents operation of time-release mechanism until g-load is satisfactory

Below 8000 ft

  • Time-release mechanism operates, cartridge fires (If BTRU fails manual deployment also available by pulling manual override handle)
  • Cartridge of headbox deployment unit fires
  • Parachute container (headbox) deploys
  • Drogue bridle released
  • Sear of time-delay unit (TDU) operated

After delay, TDU fires

  • Upper and lower harness to seat locks released
  • Leg restraint lines released
  • Parachute container (headbox) separates from main parachute and is pulled clear by auxiliary parachute
  • Sticker straps momentarily hold aircrew in seat
  • Main parachute develops, lifts aircrew and survival pack from seat and pulls sticker clips from clips causing aircrew and seat to diverge
  • Aircrew and survival pack (attached to aircrew) separate from seat
  • Pulling survival pack from seat causes automatic deployment unit (ADU) cartridge to fire (if seat to AUTO)
  • If set to MANUAL aircrew pulls handle to manually deploy
  • ADU operates, lowers survival pack on drop line below aircrew
  • Personal locator beacon operates, automatic liferaft inflation unit (ALIU) armed
  • Normal parachute descent follows
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