Printout of a story from Aviation Heritage:

Vulcan - Olympus engine Test Bed - on Fire

There has always been a need to test aircraft engines in the air as well as in static test rigs, which cannot replicate all the differences.Bristol Siddeley Engines, when first contemplating the testing of the Olympus engines designed for use in the TSR2 were allocated a Vulcan B1 bomber, XA894, which arrived at the Filton flight hangar in July 1960. The airframe was heavily modified to carry the designated engine, an Olympus 22R in a central nacelle. The test engineers wanted to find out how the engine, and particularly the intake, behaved at speed.It was not until January 1962 that the Olympus 22R, serial number 2205 commenced ground running. There were very few concerns; everything was progressing normally despite the fact that an earlier 22R had suffered ejection of a low pressure (LP) turbine, which then attempted to demolish the test bed.Flying trials started in February with only minor snags, which to an extent were expected when on test. A Canberra B2 'chase' aircraft, WK141, accompanied early flights. In June, the Vulcan was grounded to allow the engine to be rebuilt to the more powerful 22R-1 standard.

Vulcan with Olympus test pod