What We Do
Mk9 Ejection Seat
A new seat design resulting in a marked improvement for the occupant's personal comfort.
MK9
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/speed | Zero/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 range | 3rd to 98th percentile |
| Maximum Speed for ejection | 600+ KIAS |
| Parachute type | Irvin IAC 1 24 B/10704 |
| Parachute deployment | Drogue assisted |
| Drogue parachute type | Duplex drogues, 22 in. and 5ft |
| Drogue deployment | Drogue gun, cartridge generated gas – initiated by 0.55 second clockwork time-delay and tripped by trip rod |
| Harness type | Combined, skeletal torso harness with rip cord |
| Ejection seat operation type | Ejection gun and multi-tube rocket pack |
| Ejection gun | One primary cartridge, two secondary cartridges, 72.75 in. stroke, 64 ft/sec |
| Ejection initiation | Handle on seat pan initiates gas operated seat firing system |
| Electronic Sequencer | No |
| Barostatic time-release unit | Yes, with 2 sec delay to give time for speed to decrease; trip rod initiated |
| Automatic back-up unit | No |
| Manual override handle | Yes |
| Guillotine | Yes, early variant |
| Timers | Time-release for canopy jettison |
| Seat adjustment | Up/down, actuator operated, 115 V ac motor, pitch control for rocket motor adjustment to allow for varying weights of occupant |
| Arm restraints | No |
| Leg restraints | Yes, two garters |
| Oxygen supply | Bottled oxygen |
| Personal survival pack | Yes 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 ejection | No |
| Canopy jettison | Yes, also drogue container is shaped and strengthened to effect canopy penetration if necessary |
| Miniature detonating cor | No |
