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B. Alternator Pre-MOD. 160 The 70A alternator is located on the front section of the engine and is driven by the latter with a belt. It provides the energy necessary for operation to the various systems. Post-MOD. 160 The 90A alternator is located on the front section of the engine and is driven by the latter with a belt. It provides the energy necessary for operation to the various systems. C. Battery The lead-acid battery stores the energy provided by the alternator in order to ensure operation of the various systems when the alternator cannot supply energy (engine shut-down or failure). It is located at the right, behind the firewall and is accessible through inspection door 211 R located at the right side of the upper duct. Pre-MOD. 182 D. Voltmeter A voltmeter is incorporated in the engine monitoring cluster to monitor electric generation system efficiency. When the alternator operates, the indication must stabilize in the green sector. When the alternator is disconnected, the indication may go down to the yellow sector. If the indication is positioned in the lower red sector, the battery must be removed and charged. If the indication is positioned in the upper red sector while the alternator is on, the regulator must be adjusted. AFAD Validity : With front battery 24-30-00Page 2 (CA) SEP 04 E. Ammeter An ammeter can be mounted on R.H. instrument panel, as an option. It is connected to the shunt, secured to aircraft structure, behind PL1 circuit-breaker panel. The ammeter indicates current flow, in amperes, from the alternator to the battery, or from the battery to the electrical systems. Post-MOD. 182 D. Voltmeter and ammeter A digital indicator displaying the voltmeter or ammeter data is incorporated to the engine monitoring cluster, located on the upper part of the console. A switch, located on L.H. side of this indicator, enables to select either the voltmeter function (V) or the ammeter function (A). Voltmeter The main function of the voltmeter is to monitor electric generation system efficiency. With the alternator operating, the indicated value must stabilize between 26 and 29 Volts. With the alternator off, the indicated value must not decrease below 24 Volts. Red LED (VDC), located on the indicator R.H. side, illuminates for a voltage greater than 30.4 Volts or lower than 24 Volts : - Illuminated LED with displayed voltage lower than 24 Volts : . engine stopped : voltage lower than 22 Volts, remove and charge the battery, . engine running : check alternator regulator system. - Illuminated LED with displayed voltage greater than 30.4 Volts : . check alternator regulator system. Ammeter The ammeter indicates current flow in amperes from the alternator to the battery, or from the battery to electrical systems. When it indicates current flow from the battery to electrical systems, displayed values are negative. 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(12) |
