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In this case, they may be mixed in the aircraft tank in any proportions. PAGE INTENTIONALLY LEFT BLANK AAAA Validity : With ice protection - TKS system 30-10 Page 302 00 (BA) JUN 04 AIRSPEED INDICATING SYSTEM DESCRIPTION AND OPERATION 1. GENERAL The deicing system of the airspeed indicating system is provided by electric heating of the Pitot tube. U The system consists of : - the Pitot tube, - the indicator light, - the switch. 2. LOCATION (Figure 1) COMPONENT QTY AREA ACCESS DOOR REFERENCE Pitot tube 1 500 / 30-30-00 Indicator light 1 250 251 L 30-30-00 Switch 1 250 252 30-30-00 3. DESCRIPTION A. Pitot tube The Pitot tube heating is provided by a resistor inside the tube. It is located under the L.H. wing. NOTE : A second Pitot tube can be installed under the R.H. wing. B. Indicator light When the Pitot deicing system operates, one (or two) green indicator light(s) comes (come) on at the advisory panel. C. Switch With only one Pitot tube The switch-breaker located on the front pedestal energizes the Pitot tube heating. With two Pitot tubes The dual switch located on the R.N. lower panel strip energizes the Pitot tube heating. In this case, circuits are protected by two circuit breakers located on circuit breakers panel. a ® cv PITOT HEAT A - Switch-breaker (1 Pitot tube) B - Indicator light C - Heated Pitot D - Dual switch (2 Pitot tubes) Airspeed indicating system - Identification and location of components Figure 1 AIRSPEED INDICATING SYSTEM ADJUSTMENT / TEST NOTE : This procedure is applicable to L.H. and R.H. installations. Information specific to R.H. installation are given in square brackets. 1. OPERATIONAL TEST OF PITOT TUBE HEATING A. Tools and consumable materials - Ground power unit B. Procedure 1) Make sure Pitot tube cover is removed. 2) If required, connect the ground power unit - refer to 24-40-00. 3) Close main switch-breaker. With only one Pitot tube 4) Close Pitot tube heating switch-breaker. With two Pitot tubes 4) Make sure "Left Pitot" and "Right Pitot" circuit breakers are closed. 5) Set dual switch to "ON". All 6) Check illumination of indicator light on the advisory panel. WARNING : CONTACT WITH HEATED PITOT TUBE MAY PROVOKE SEVERE BURNS. DETECT HEAT BY APPROACHING THE HAND, TAKE CARE NOT TO BE IN CONTACT WITH PITOT TUBE. 7) Check that Pitot tube heats itself. 8) Open Pitot heating switch-breaker. [Set dual switch to "OFF".] 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 30 防冰和排雨 TB20飞机维护手册(7) |
