Eurofighter Typhoon is the world’s most advanced swing-role combat aircraft. A highly agile aircraft, it is capable of ground-attack as well as air defence. With 620 aircraft on order, it is also the largest and most complex European military aviation project currently running. A collaboration between Germany, Italy, Spain and the UK, it is designed to meet air force requirements well into the 21 st Century. Advanced electronics and state of the art onboard computers are critical to the Typhoon’s high performance and agility. These systems need to be safe, reliable and easily maintained over the estimated 25 year lifecycle of the aircraft. The Ada programming language was therefore the natural choice for Typhoon’s onboard computers. It provides a high-integrity, high-quality development environment with a well defined structure that is designed to produce highly reliable and maintainable real-time software. Typhoon is currently the largest European Ada project with over 500 developers working in the language. Tranche 1 of the project saw 1.5 million lines of code being created. BAE Systems is a key member of the Eurofighter consortium, responsible for a number of areas including the aircraft’s cockpit. As part of latest phase of the project (named “Tranche 2”) it needed a solution for host Ada compilation in the development of software for the Typhoon’s mission computers, as well as for desktop testing.