So maybe Chris was just 'standing in'? Great videos bring back many memories - does anyone remember the agro of the y-y as mentioned by Terry Bollans in the last vid? This was to try and pick up bearing failures - as, if a donc didn't achieve the y-y there was a good chance that the rear bearing was on its way out. I think the next step was for the engineers to check the temperature of the air coming out of the breather. The Spey was odd with different values for the TGT limit in all configurations, although we (RAF) fairly quickly limited use of the 12th stage bleed in favour of just using 7th stage to try and avoid hot air leaks.