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1) Remove engine cowling 121 - refer to 71-10-01 and tilt inspection door 212R - refer to 06-30-00 or remove inspection door 211 R if installed - refer to 06-30-00. 2) Make sure the bonding of the voltage regulator grounding wire is coorect - refer to 20-00-12. 3) Connect a voltmeter to the mains (if necessary, use the cigar lighter). WARNING : TO REACH THE VOLTAGE REGULATOR WHEN THE ENGINE IS RUNNING, MOVE ALONG THE WINGS AND THE FUSELAGE WHILE REMAINING CONSTANTLY AND PHYSICALLY IN CONTACT WITH THE WINGS AND THE FUSELAGE. 4) Perform a test run-up - refer to 05-30-02. 5) Once the different engine parameters have stabilized, with the alternator switch-breaker closed, switch on the following equipment items to reach a load charge of approximately 20 A : - landing and taxiing lights, - navigation lights and anti-collision lights. 6) Check that the on-load mains voltage at 2000 rpm is greater than 13.5 VDC and that the indication of the engine monitoring cluster voltmeter stabilizes inside the green sector. If necessary, adjust the voltage with the voltage regulator adjustment screw. 7) Check the on-load regulation range between 1200 and 2500 rpm, the indication of the engine monitoring cluster voltmeter remains inside the green sector. 8) Switch off the equipment items. 9) Check that the off-load voltage at 2000 rpm is within 13.9 and 14.1 VDC. 10) Check the amber (red on U.K. aircraft) warning light labeled "ALTS" for operation : a) With the equipment items switched off, open the alternator switch-breaker and switch on the same equipment items. The warning light must come on. b) With the engine rating within the regulation range (1200 to 2500 rpm), close the alternator switch-breaker. The warning light must go off. 11) Shut down the engine - refer to 05-30-02. 12) Make sure all the tools and materials are removed and the work area is clean and free from debris. 13) Close inspection door 212R and install engine cowling 121 - refer to 71-10-01 or install inspection door 211 R if removed. 14) Disconnect the voltmeter from the mains. 3. CHECK OF PRESTOLITE VOLTAGE REGULATOR OVERVOLTAGE SYSTEM (Figure 601) A. Tools and consumable materials - 1 stabilized power supply source adjustable within 12 and 18 V B. Procedure 1) Disconnect the overvoltage relay. 2) Supply the overvoltage relay between the ground and the "BAT" terminal with a stabilized power supply source adjustable within 12 and 18 V. 3) Vary the supply voltage, check that the overvoltage relay triggers between 15.5 and 16.5 VDC. NOTE : In case of incorrect operation, replace the regulator (no setting is possible). 4) Connect the overvoltage relay. 4. CHECK OF LAMAR VOLTAGE REGULATOR OVERVOLTAGE SYSTEM (Figure 603) A. Tools and consumable materials - 1 stabilized power supply source adjustable within 12 and 18 V 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 24 COMMUNICATIONS TB20飞机维护手册 电源(19) |
