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Detail Steps/Work Items Key Items/References
(1) Remove the engine cowlings. Refer to Section 71-11.
(2) Disconnect the airplane main battery: S Disconnect the negative cable from the battery. S Disconnect the positive cable from the battery.
(3) Remove the cover from the relay box.
(4) Release the 100 A alternator fuse. Dispose of the old fuse.
(5) Install a new 100 A fuse.
(6) Install the cover to the relay box.
(7) Do an engine ground test. The alternator warning light must go OFF.
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% Section 24-34 % Battery System - TAE 125 Diesel Engine % 1. General
% This Section tells you about the battery systems for airplanes with the TAE 125 Diesel engine % installed. See Sections 24-01 and 24-33 for the description and operation of the battery in the % electrical generation system.
% The airplane has three batteries:
%) A main battery located on the top front face of the engine firewall. This battery provides the usual % airplane electrical services.
%) An ECU backup battery located below the rear passengers′ seat on the RH side. The ECU backup % battery connects directly to the ECU alternate power relay. This battery provides power to the ECU % if the all other power supplies fail.
%) An alternator excitation battery located on the instrument panel shelf. It is a 12 V; 1.3 Ah battery. % It connects directly to the alternator field connection when the ENGINE MASTER switch is set to % ON. Refer to Section 24-33 for maintenance procedures for this battery.
% 2. Main Battery Description and Operation
% The main battery is a 12 V, 35 Ah sealed battery. A tray on the top face of the firewall, near the center % holds the base of the battery. A strap holds the battery and cover in place. The positive and negative % cables attach to terminals at the top, front of the battery. The usual rubber caps protect the % connections.
% When the alternator voltage is greater than the battery voltage, the alternator charges the battery.
% When the alternator is operating, the digital voltmeter shows the alternator voltage. When the % alternator is off-line, the digital voltmeter shows the battery voltage.
% The battery supplies current to the ECU bus through the battery relay. The battery relay is in the relay % junction box which is located on the firewall, adjacent to the battery. There is no circuit-protection.
% The battery also supplies the hot battery bus. A 100 ampère fuse protects the hot battery system.
% Regular maintenance of the battery system is necessary. Do not wait until a starting problem occurs.
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% % Figure 1: Main Battery Installation %
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% 3. ECU Backup Battery Description and Operation
% The ECU backup battery is a 12 V, 12 Ah sealed unit. A tray below the right passenger’s seat holds % the base of the battery. A clamp holds the battery in place. The positive and negative cables attach % to terminals at the top of the battery. The usual rubber caps protect the connections.
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