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Fuel System
AMM
% Section 28-41 % Fuel Quantity Indicating - TAE 125 Diesel Engine % 1. General
% This Section tells you about the fuel quantity indicating system of the DA 40 with the TAE 125 Diesel % engine installed. Refer to Section 28-01 for the general data on the fuel system. Refer to Section 31-11 % for data on replacing the fuel quantity indicator.
% 2. Description
% Figure 1 shows the fuel quantity indication system main components. The fuel quantity indication % system is part of the engine indicating system. The fuel tank in each wing has a fuel probe. The fuel % quantity indicating system cannot be calibrated in service.
% Electric cables connect the fuel probes to the engine indicating system. The system displays the fuel % quantity on the Auxiliary Engine Display (AED) located in the right instrument panel.
% Electric cables also connect the low fuel sensor in the left tank to a low fuel caution light in the % annunciator panel. Refer to Section 31-51 for more data on the annunciator panel.
% 3. Operation
% As the fuel level in the fuel tanks decreases, the area of the fuel probe which is “wetted” with fuel will % also decrease. The amount of "wetted" area is converted into an electrical signal which sets the fuel % quantity reading at the fuel quantity indicator. The fuel quantity indicator displays the quantity of fuel % in the left fuel tank and the right fuel tank. The fuel quantity indicator shows the fuel quantity with a % chain of LED's. The display shows the fuel quantity in US gallons. The maximum indicated fuel quantity % is 14 US gal per tank.
% The low fuel sensor in the left tank operates a caution light on the annunciator panel. When the fuel % level in the left tank falls below 3 US gal (+2/-1 US gal) the caution light comes on. Refer to Section % 31-51 for more data on the LOW FUEL caution light.
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% VIEW ON INBOARD END OF LEFT FUEL TANK
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% Figure 1: Fuel Quantity Indication Components in the Left Fuel Tank
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28-41-00
Fuel System
AMM AIRCRAFT
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Temperature Sensor
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Low Fuel Sensor
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Right Fuel Tank
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VIEW ON INBOARD END OF RIGHT FUEL TANK
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Fuel Quantity Probe
% % % % % Figure 2: Fuel Quantity Indication Components in the Right Fuel Tank %
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28-41-00
AMM
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28-41-00
Fuel System
AMM
% Trouble-Shooting % 1. General
% The table below lists the defects you could have with the fuel quantity indicating 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
Fuel quantity indication for one tank incorrect, or first and last LED on fuel quantity indicator illuminated. Other tank reads correctly. Fuel probe unit in fuel tank defective/contaminated. Fuel quantity indication system wiring defective. Defuel/refuel the related tank to flush the fuel probe. If the indication is still incorrect then replace the fuel probe. Do a test of the indication system wiring. Refer to Chapter 92-00 for the wiring diagrams.
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