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AMM
%) ENGINE An amber caution light shows when any indication on an engine instrument
% (CED-125 or AED-125) changes from the green to the yellow range.
%) ALTERNATOR
% An amber caution light shows alternator failure. The internal regulator of the
% alternator operates the ALTERNATOR caution message.
%) ECU A An amber caution light shows when the ECU A fails. The engine control system
% changes to the ECU B automatically.
%) ECU B An amber caution light shows when the ECU B fails.
%) FUEL TRANS
% A white status light shows when the fuel transfer pump is ON.
%) PITOT An amber caution light shows that the Pitot heating system is OFF. The caution
% light receives an electrical current from the heater side of the Pitot heat relay. The
% Pitot heating caution message shows when the Pitot heating is not switched ON,
% or when there is a failure of the Pitot heating system.
%
% Prolonged operation of the Pitot heating on the ground can also cause the Pitot
% heating caution message to show. This happens when the thermal switch
% operates. (The switch prevents overheating of the Pitot heating system on the
% ground). This is a normal function of the system. After a cooling period, the
% heating system will come on again automatically.
%) LOW FUEL An amber caution light shows low fuel level is less than 3 US gal (+2/-1 US gal)
% in the left fuel tank. The fuel level switch in the left fuel tank operates the low fuel
% caution message.
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AMM
%) TRIM FAIL This light is only used when the autopilot system is installed.
%
% Red warning light indicating a failure of the automatic trim system of the autopilot.
% The autopilot control unit activates the trim fail warning message when there is a
% failure of the automatic trim system of the autopilot.
%) GLOW A status message shows when the glow relay is energized. This is usually only
% before or during start.
% 3. Functional Check
% The functional check is automatically started after switching the ELECTRIC MASTER key switch ON. % All lights are flashed, and the aural alert is muted. By pressing the 'acknowledge' button, the lights are % extinguished, and a short aural alert is sounded. This test verifies functionality of the microprocessor, % the lights, and the aural signal.
% You may do additional system tests by holding the 'acknowledge' button for 2 seconds. All lights will % begin flashing, and the aural alert will sound continuously.
% 4. Wiring Diagrams
% Refer to Chapter 92 for the wiring diagram for the central warning system.
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Indicating Systems
AMM
% Trouble-Shooting % 1. General
% The table below lists the defects you could have with the Central Warning System. If you have the % trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair % given in the Repair column.
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Trouble Possible Cause Repair 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：钻石40飞机维护手册 DA 40 SERIES AMM 3(72)
