The German military has stopped all routine flights with its NH90 multi-function helicopters because of a design flaw.

The Defense Ministry said in a statement Friday that the problem was discovered by technicians investigating the explosion of a German NH90's engine in Uzbekistan in June.

Germany has some 35 NH90 helicopters, which are used to carry heavy loads or transport up to 20 troops. It was developed in the mid 1990s by NHIndustries, a consortium owned by Airbus Helicopters, AgustaWestland Fokker Aerostructures.

The NH90 was originally ordered by Germany, France, Italy and the Netherlands, and is now used by about a dozen countries.