Interesting. As I said, I'm just posting what was reported in the 'Daily Telegraph' yesterday, so I don't know where they got that from.
Raw Data, or other 146 drivers :
Do you turn the engine anti-ice off below a certain temperature (-40 SAT in the 737)? This equates to 27500 ft. in ISA conditions.
Of course, the Telegraph hates BAe because they support Europe and the big 'satan' that is Airbus (which they fail to realise supports thousands of UK jobs), so could be part of their 'campaign'.