Pre Production

The 6 pre production airframes were allocated as follows, Germany 3, Britain 2 and Italy 1. The two British pre production airframes XZ630/PS12 and XZ631/P15 were used for weapons release trials, PS12; and supersonic flutter testing, PS15. XZ631 was the first aircraft completed to RAF production standards.

Pre Production airframe P11/98+01 was the first to have the rear fin fillet.

Pre Production airframe P13/98+02 was the first to have the modified taileron leading edge profile which has a noticeable kink.

Pre Production airframe P15/XZ631 was the first to have the production rear fuselage and a fin mounted fuel tank.

Pre Production airframe P16/98+03 was later to become the prototype for the ECR.

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