From kls Fri May 29 02:44:07 1998 Path: bounce-back Newsgroups: sci.aeronautics.airliners Date: 29 May 98 02:44:07 From: "john r." Subject: Re: Rosemount Probe References: Message-ID: Approved: kls@ohare.Chicago.COM Sender: kls@ohare.Chicago.COM Organization: silence In article , "Yves E. Hoebeke" writes >I would like to understand how the Rosemount probe can deliver accurate TAT >info while it's heating element (anti-ice) is switched on. > >I understand from my textbooks that this will not interfere with its >measurement accuracy, but I do not understand how. Its in the design, I am told. The sensor takes air from the center of the flow whereas heated air is on only the outer side of the flow. There must be a very small heating effect but is is disregarded. I once changed a probe for inflight errors and found a large charred locust jammed inside, disrupting the airflow. It certainly does heat the sensors if run on the ground, its how we check both the probes a/ice heating and signal. Cheers, -- _J_O_H_N____R_E_L_P_H____________ john@guava.demon.co.uk Teddington, Middlesex in Cold Old England.