PROBE HEAT COMPUTER (PHC), USED IN CONJUNCTION WITH AN AIRCRAFT ANTI-ICING SYSTEM OF PROBES AND SENSORS. THE PHC IS A RECTANGULAR UNIT WHICH HAS A BOX ASSEMBLY WITH PRINTED CIRCUIT BOARDS. THE CPU PERMANENTLY MONITORS THE PROBE ANTI-ICING OPERATION. THE PHC PROVIDES AN ANTI-ICING FUNCTION WITH DATA PROCESSING. THE FUNCTIONS INCLUDE: POWER SUPPLY, ANTI ICING OF THE TOTAL PRESSURE PROBE, OUTER AIR TEMPERATURE SENSOR, ANGLE OF ATTACK SENSOR AND RIGHT/LEFT STATIC PRESSURE PROBE. IT PROVIDES POWER SUPPLY CONTROL AND SUPPLIES RELATED WARNING SIGNALS.

CLASSIFICATION HAS BEEN DETERMINED IN ACCORDANCE WITH THE FOLLOWING:- GENERAL INTERPRETATIVE RULES (GIR)S GIR 1 HAS BEEN USED TO CLASSIFY THIS PRODUCT BY THE TERMS OF HEADING 9032 - AUTOMATIC REGULATING OR CONTROLLING INSTRUMENTS AND APPARATUS GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 9032 89 - OTHER INSTRUMENTS AND APPARATUS; OTHER THAN HYDRAULIC OR PNEUMATIC TARIC 90328900 10 - FOR USE IN CIVIL AIRCRAFT ALSO CLASSIFIED IN ACCORDANCE WITH:- NOTE 7 (B) TO CHAPTER 90 HARMONIZED SYSTEM EXPLANATORY NOTES (HSEN) TO HEADING 90.32