Double TAT probe( L/H & R/H of Nose )only to be found on 757-300 which is fitted with 3 ADIRU's ( combination of ADC & IRU in same box )instead of 2 ADC's and 3 IRU's.
Bog standard 757-200 TAT probe fitted with twin sensing elements and one heating element( R/H side of nose fwd of those mysterious doors ! )Loosing the heater element will cause both TAT sensing element signals to become invalid to certain systems.
If you think that loosing the TAT heater causes you problems, you should see what happens on the A320 if you lose the captains clock !!!
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