|Martin-Baker Mk.7A on display at the Royal Air Force Museum London|
The Mk.7 seat was developed from the earlier Mk.5 design by the addition of a rocket pack to enable zero-zero capability. A large upgrade program to retrofit Mk.7 seats to all Lockheed F-104 Starfighter aircraft in German Air Force service was initiated by Johannes Steinhoff in late 1967, this measure improved the type's safety record and several other European nations operating the Starfighter followed Germany's lead.[nb 1]
Operating either the seat pan or face blind firing handles initiates aircraft canopy jettison, as the canopy clears an interlock is removed which allows the main gun located at the rear of the seat to fire, the main gun is a telescopic tube with two explosive charges that fire in sequence. As the seat moves up its guide rails an emergency oxygen supply is activated and personal equipment tubing and communication leads are automatically disconnected, leg restraints also operate.
As the seat moves further up and out of the aircraft the rocket pack is fired by a lanyard attached to the cockpit floor. A steel rod, known as the drogue gun, is fired and extracts two small parachutes to stabilise the seat's descent path. A barostatic mechanism prevents the main parachute from opening above an altitude of 10,000 ft (3,000 m) A time delay mechanism operates the main parachute below this altitude in conjunction with another device to prevent the parachute opening at high speed. The seat then separates from the occupant for a normal parachute descent, a manual separation handle is provided should the automatic system fail.
The Mk.7 ejection seat has been installed in the following aircraft types, either as original equipment or by modification:
List from Martin-Baker.
- EWR VJ 101
- Grumman A-6 Intruder
- Grumman F-9 Cougar
- Grumman F-14 Tomcat
- Lockheed F-104 Starfighter
- McDonnell Douglas F-4 Phantom II
- Northrop F-5
- Northrop Grumman EA-6B Prowler
- Vought F-8 Crusader
Seats on display
- Maximum operating height: 50,000 ft (15,240 m)
- Minimum operating height: Ground level
- Minimum operating speed: Zero
- Maximum operating speed: 600 knots indicated airspeed
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- Belgium and the Netherlands retained original equipment seats.
- Martin-Baker MK.7 fact sheets www.martin-baker.com Retrieved: 9 December 2011
- Kropf 2002, p. 51.
- Royal Air Force Museum London - Martin-Baker Mk.7A navigator.rafmuseum.org Retrieved: 9 December 2011