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(DA) FEB 00 The slaving accessory consists of : - a deviation indicator (millivoitmeter) to display the slaving error between the flux valve and the slaved directional gyro, - a "SLAVE-FREE" inverter for the selection of the heading reference system operating mode ("slaved gyro" mode and "free gyro" mode), - a two-position (CW/CCW) switch for manual adjustment of the directional heading when the "FREE" mode is selected, - two potentiometers for magnetic compensation of the flux valve. One of the potentiometers performs the correction along the NORTH/SOUTH axis and the other potentiometer along the EAST/WEST axis. The slaving accessory is electrically supplied by the slaved directional gyro. The slaving accessory is installed on the R.H. instrument panel. 4. OPERATION NOTE : For equipment operation and maintenance, refer to the supplier's Maintenance Manual. A. Heading reference system in "slaved gyro" mode When the heading reference system is energized, the heading signal provided by the slaved directional gyro is quickly and automatically aligned with the magnetic direction reference detected by the flux valve. This initial alignment occurs at a rate of 14 degrees/second. After this alignment sequence, a slow slaving function, at a rate of 2.5 degrees/minute is initiated to keep the true magnetic heading and the heading of the output synchro transmitter aligned. On the slaved directional gyro, the malfunction relay reports to the warning flag condition for : - loss of power, - failure of gyro motor to maintain spin. B. Heading reference system in "free gyro" mode With the "SLAVE-FREE" inverter set to "FREE" position, the system operates in the "free gyro" mode. The magnetic slaving loop of the slaved directional gyro is disengaged. The pilot manually cancels the deviation indicated by the slaving accessory deviation pointer using the "CW-CCW" switch. ALAL Validity : KCS 305 with EFIS 34-21-00Page 4 (DA) FEB 00 SLAVED DIRECTIONAL GYRO MAINTENANCE PRACTICES 1. SERVICING None 2. REMOVAL / INSTALLATION - SLAVED DIRECTIONAL GYRO (Figure 201) A. Tools and consumable materials Blanking caps and plugs B. Removal of the slaved directional gyro CAUTION : OBSERVE ALL THE INSTRUCTIONS RELATIVE TO THE HANDLING OF GYROSCOPES DESCRIBED IN 34-20-00, PAGE 201. 1) Make sure that the main switch-breaker is open. 2) Open baggage compartment door 219 and remove compartment bottom door 242. 3) Disconnect connector (1). 4) Remove screws (3). 5) Remove slaved directional gyro (4). Blank off connector (1). 6) If mounting rack (5) removal is necessary, remove screws (7). 7) Remove mounting rack (5). 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 34 导航 TB20飞机维护手册 1(39) |
