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- Ground power unit B. Procedure 1) If installed, remove inspection door 211L - refer to 06-30-00. Otherwise, tilt the L.H. instrument panel. NOTE : If inspection door 211 L is not installed, the following operations are to be performed from the cockpit. 2) Straighten locking tabs (4). CAUTION : RUN THE EMERGENCY VACUUM PUMP FOR A SHORT PERIOD (NO LONGER THAN TWO MINUTES) AS PROLONGED RUNNING WILL LEAD TO INSUFFICIENT BATTERY CHARGE LEVEL. NOTE : Should it be necessary to run the pump for more than two minutes, it is recommended to use a ground power unit (if ground power receptacle is installed). 3) Close main switch-breaker. 4) Set S59 "AUX SUCT" switch (6) to "ON". 5) Adjust flow cock (1) until pressure indicator (5) reads 5 ± 0.1 in.Hg. 6) Set S59 "AUX SUCT" switch (6) to "OFF". 7) Open main switch-breaker. 8) Bend locking tabs (4) of flow cock (1). 9) Make sure all the tools and materials are removed and the work area is clean and free from debris. 10) If installed, install inspection door 211 L - refer to 06-30-00. Otherwise, lock the L.H. instrument panel. 2. TEST OF THE EMERGENCY DISTRIBUTION SYSTEM (Figure 502) A. Tools and consumable materials - Ground power unit B. Procedure CAUTION : RUN THE EMERGENCY VACUUM PUMP FOR A SHORT PERIOD (NO LONGER THAN TWO MINUTES) AS PROLONGED RUNNING WILL LEAD TO INSUFFICIENT BATTERY CHARGE LEVEL. NOTE : Should it be necessary to run the pump for more than two minutes, it is recommended to use a ground power unit (if ground power receptacle is installed). 1) Close main switch-breaker. "GYRO SUCT" red warning light (1) comes on. 2) If "GYRO SUCT" red warning light (1) remains off, press "TEST" button (2), then repair the wiring or replace the bulb, as applicable. 3) Set S59 "AUX SUCT" switch (5) to "ON". "GYRO SUCT" red warning light (1) goes off and "AUX SUCT" green indicator light (3) comes on. 4) Check that the pointer of pressure indicator (4) remains in the green range between 4.4 and 5.2 in.Hg. WA Validity : OPTION 37-12-00(BA) Page 501 SEP 04 5) Set S59 "AUX SUCT" switch (5) to "OFF". "AUX SUCT" green indicator light (3) goes off and "GYRO SUCT" red warning light (1) comes on. 6) If the pointer was outside the green range, perform the following operations and check the system for correct operation after each step : a) Adjust the regulating valve - refer to Paragraph 1., b) If the values are still not obtained, check the entire system - refer to Page 601, c) Check the instruments, replace if necessary. MAA Validity : OPTION 37-12-00Page 502 (BA) SEP 04 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 37 真空 TB20飞机维护手册(12) |
