MK7 EJECTION
SEATS
Over 2400 lives saved and currently over 1500 seats in service Currently flying in F-4 and Prowler

The introduction of the rocket pack to the range of Mk4 and Mk5 seats created the basic Mk6 and Mk7 ranges respectively. However, many of the Mk7 range of seats were subsequently embodied with additional improvements in design such as Power Retraction Systems, Remote Fired Rocket Systems and Sequencing Systems as later described.

The Mk7 ejection seat is still in service today in the F-4 Phantom and Prowler. The seat is operated by the following countries: Egypt, Germany, Greece, Japan, South Korea, Turkey and USA. To date there have been 2421 lives saved using the Mk7 seat.

Operating Ceiling 50000+ ft (15,250m)
Minimum height/Speed Zero/zero
Crew boarding mass range 7A, F-4 US Phantom - 70.8 to 120.6kg
Q7A, F5 - 65.5 to 110.0kg
GRUEA7, Prowler - 71.7 to 114.8kg
7A F-4 RAF Phantom – 72.6 to 111.1kg
Q7, F104 Starfighter – 68.5 to 107.5kg
H7 – 73.6 to 112.2 kg
Crew size range 7A - 3rd to 98th percentile
Q7A - 3rd to 98th percentile
GRUEA7 - 5th to 95th percentile
7A - 5th to 95th percentile
Q7 - 5th to 95th percentile
H7 - 5th to 95th percentile
Maximum Speed for ejection 600+ KIAS
Parachute type Irvin I 24
Parachute deployment Drogue assisted
Harness type Combined
Ejection seat operation type Ejection gun and multi-tube rocket pack
Ejection gun 80 ft/sec One primary cartridge, two secondary, cartridges, 72 in. stroke
Ejection initiation Face screen or seat pan firing handle
Barostatic time-release unit Yes, with g-restrictor
Manual override handle Yes
Guillotine Yes
Timers Time delays for command ejection, Time-release unit for man/seat separation
Seat adjustment Up/down, manual operation
Arm restraints No
Leg restraints Yes, two garters
Oxygen supply Bottled oxygen
Personal survival pack Yes with liferaft
Aircrew services Personal equipment connector (PEC) provides connections for
- main oxygen
- emergency oxygen
- air ventilated suit
- anti-g suit
- mic/tel
Canopy jettison Yes, aircraft variant dependent
Command ejection Optional
  • F-104
  • Vought F-8
  • EWR VJ 101C
  • PHANTOM
  • Lockheed F104G/TF104G
  • PROWLER
  • F-5
  • F-104
  • F-4
  • F-14
  • The pilot pulls the face screen seat firing handle
  • Canopy jettison initiated
  • Ejection gun fires, seat moves up guide rails and the secondary cartridges fire
  • Emergency oxygen tripped
  • Aircrew services disconnect
  • Leg restraints operate
  • As seat rises, static line initiates time-delay which fires drogue gun after 0.5 seconds
  • As seat rises, static line initiates time-release unit
  • 22 in. dia then 5 ft dia drogues stabilise and slow seat

Above 10000ft

  • Barostat prevents operation of time-release mechanism

High speed

  • g-restrictor prevents operation of time-release mechanism

Below 10000ft, (low speed)

  • 1.5 sec after initiation of time-release unit the plunger releases scissor shackle to transfer pull of drogue to lifting lines of parachute, releasing it from seat
  • Release face blind
  • Harness and leg lines released from seat
  • Drogues deploy main parachute, pilot separates from seat
  • Normal descent
  • Manual separation system available if necessary. Operation of manual separation handle fires a cartridge that operates a guillotine, severing the parachute attachment line, linkages function releasing parachute harness, negative-g strap, PEC and leg restraint cords.
  • Freeing parachute from seat.
  • Aircrew can then use rip cord to operate parachute.
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