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This sub-system consists of the following elements :
- regulator - overvoltage relay,
- alternator,
- battery,
- voltmeter integrated into the engine monitoring cluster - refer to 31-10-00,
- ammeter (option) if installed,
- alternator control,
- battery relay,
- amber (red on U.K. aircraft) warning light labeled "ALT'' on the advisory panel - refer to 31-50-00.
2. LOCATION (Figures 1 and 1A)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
Regulator - overvoltage relay 1 210 211R 24-30-00
Alternator 1 100 131 24-30-01
Battery 1 210 219 / 243 24-30-02
Alternator control 1 252 / 24-50-00
Battery relay 1 210 218A 24-30-03
Engine monitoring cluster 1 251C / 31-10-00
Advisory panel 1 251 L / 31-50-00
3. DESCRIPTION
A. Regulator - overvoltage relay
The regulator and the overvoltage relay (integrated or not in this regulator) are the elements which regulate voltage and detect generation system overvoltages. When an overvoltage occurs in the system, they cut off the alternator energization and the amber (red on U.K. aircraft) warning light labeled "ALTS" illuminates.
They are located above and to the right of the front table and are fixed on the firewall on the cabin side.
B. Alternator
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.
ACAA
Validity : S / N 1 - 822,850 - 887,889 - 947 24-30-00 (CG) SEP 04
Page 1
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 under the baggage compartment floor and is accessible through an inspection door located in the compartment.
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.
E. Ammeter
An ammeter can be mounted on R.H. instrument panel or on L.H. strip, 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.
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本文链接地址：TB20 MAINTENANCE MANUAL 24 COMMUNICATIONS TB20飞机维护手册 电源(14)
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