Mk9 Ejection Seat

A new seat design resulting in a marked improvement for the occupant's personal comfort.


Currently flying in Sepecat Jaguar

There are 141 Mk9 seats currently in service

After some 23 years of development, the design of the Martin-Baker ejection seats was becoming somewhat complex, and, towards the end of the 1960s, a new design was put in hand which eventually became the Mk9 seat.

The general design features of the ejection gun and guide rail, the barostatic time-release unit, the drogue gun and the personal equipment connector were retained, but considerable changes were made to the general seat structure, the drogue container, the parachute and the seat pan.

These design changes resulted in a marked improvement in the appearance of the seat and in personal comfort for the occupant. These seats were equipped with power retraction and a completely new gas-operated seat firing system, superseding firing cables and utilising one firing handle only, mounted on the seat pan, the face screen and its firing cable being dispensed with.

Martin-Baker offers partial support where possible for the Mk9 Seat due to supply chain closures.

Aircraft fitted: Jaguar, Dornier DO31, Nord 500, VAK 191, Harrier
Operating ceiling 50000+ ft (15,250m)
Minimum height/speedZero/zero
Crew boarding mass range 9B Mk 1, Mk 2 and Mk 3 – 73.0 to 112.0kg; 9B Mk 4 – 65.0 to 135.0kg
Crew size range3rd to 98th percentile
Maximum Speed for ejection600+ KIAS
Parachute type Irvin IAC 1 24 B/10704
Parachute deploymentDrogue assisted
Drogue parachute type Duplex drogues, 22 in. and 5ft
Drogue deploymentDrogue gun, cartridge generated gas – initiated by 0.55 second clockwork time-delay and tripped by trip rod
Harness typeCombined, skeletal torso harness with rip cord
Ejection seat operation typeEjection gun and multi-tube rocket pack
Ejection gunOne primary cartridge, two secondary cartridges, 72.75 in. stroke, 64 ft/sec
Ejection initiationHandle on seat pan initiates gas operated seat firing system
Electronic SequencerNo
Barostatic time-release unitYes, with 2 sec delay to give time for speed to decrease; trip rod initiated
Automatic back-up unitNo
Manual override handleYes
GuillotineYes, early variant
TimersTime-release for canopy jettison
Seat adjustmentUp/down, actuator operated, 115 V ac motor, pitch control for rocket motor adjustment to allow for varying weights of occupant
Arm restraintsNo
Leg restraintsYes, two garters
Oxygen supplyBottled oxygen
Personal survival packYes with liferaft (option)
Aircrew services Intertechnique controller with oxygen flow sensor and pressure warning; Personal equipment connector (PEC) provides connections for main oxygen, emergency oxygen, anti-g suit and mic/tel
Command ejectionNo
Canopy jettisonYes, also drogue container is shaped and strengthened to effect canopy penetration if necessary
Miniature detonating corNo

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