Overview
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. The US16LA-1/2 lightweight ejection seat is designed for training aircraft. 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 accomodate a very wide, size and weight range, including female aircrew.
Specifications
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Specifications
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US16LA - JPATS
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Operating ceiling
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50 000+ ft (15,250 m) (aircraft limit 31 000 ft)
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Minimum height/speed
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Zero/zero in near level attitude
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Crew boarding mass range
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62.3 to 123.0 kg
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Crew size range
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JPATS multi-variate body size cases 1 to 7
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Maximum Speed for ejection
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600 KIAS (aircraft limit 316 KIAS)
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Parachute type
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GQ Type 5000
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Parachute deployment
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Cartridge initiated
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Auxiliary parachute
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22 in.
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Drogue parachute
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5 ft
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Drogue deployment
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Cartridge initiated and deployed
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Harness type
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Combined, torso
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Ejection seat operation type
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Ejection guns and underseat rocket motor
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Ejection gun
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Twin
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Ejection initiation
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Handle on seat pan initiates gas operated seat
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firing system
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Automatic back-up unit
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No, manual override
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Electronic sequencer
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No
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Barostatic time-release unit
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Yes + g-restrictor, cartridge initiated
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Timers
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Time delays in sequencing system
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Seat adjustment
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Up/down actuator operated 28 Vdc
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Arm restraints
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No
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Leg restraints
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Yes, two garters
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Oxygen supply
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Bottled emergency oxygen
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Personal survival pack (PSP)
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Yes + automatic deployment
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Aircrew services
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Connection to emergency oxygen supply
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Command ejection
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Yes, via Interseat Sequencing System
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Canopy jettison
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No
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Canopy fracturing system
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Yes
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Interseat Sequencing System (ISS)
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Yes
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Seat firing handle pulled causing seat initiation cartridge to fire
Interseat sequencing 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 conditions 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
Variants
No variants available