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Old 26th June 2006 | 19:37
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78deg
 
Joined: Mar 2001
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B767 and 757

TAT measured by probe that is continualy deice by bleed air, on the ground this is unreliable as no or lack of airflow. This is why eng anti ice temp requirements are based on OAT on the ground(ATIS) and TAT/SAT in flight EICAS/CDU
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