Table 3-2.—Troubleshooting Wheel Brake System Probable Cause Isolation Procedure Remedy Brake accumulator does not become charged Brake accumulator charge pressure Check that pressure gauge reads Charge brake accumulator. low 800 psi. Pressure gauge Replace pressure gauge with one If trouble is corrected, discard known to operate properly. (Refer defective gauge. to WP084 00.) Brake selector-valve rigging Check selector-valve rigging. Rig selector valve. (Refer to WP082 00.) Brake accumulator Replace accumulator with one known to operate properly. (Refer to WP083 00.) Brake cycles gauge Replace gauge with one known to operate properly. (Refer to WP086 00.) Thermal relief valve Replace relief valve with one known to operate properly. (Refer — to WP087 00.) — installation. Installation diagrams show general each aircraft generally provides troubleshooting aids location, function, and appearance of parts and assemblies. On some installation diagrams, letters on the principal view refer to a detailed view located elsewhere on the diagram. Each detailed view is an enlarged drawing of a portion of the system identifying each of the principal components for purposes of clarification. Diagrams of this type are invaluable to maintenance personnel in identifying and locating components. Installation diagrams will aid you in understanding the principle of operation of complicated systems. TROUBLESHOOTING AIRCRAFT SYSTEMS Learning Objective: Recognize the definition of troubleshooting, and identifiy the seven steps in the troubleshooting procedures. Troubleshooting/trouble analysis may prove to be the most challenging part of system maintenance. Troubleshooting is the logical or deductive reasoning procedure used when you are determining what unit is causing a particular system malfunction. The MIM for that encompass seven steps. The steps are conduct a visual inspection, conduct an operational check, classify the trouble, isolate the trouble, locate the trouble, correct the trouble, and conduct a final operational check. The various MIMs provide a variety of troubleshooting aids. Table 3-1 shows a representative troubleshooting table. The troubles in this table are numbered to correspond with the step of the operational check procedures where the trouble will become apparent. Other MIMs use trouble analysis sheets to pursue a trouble to a satisfactory solution by the process of elimination. The symptom is defined in tabular form with a remedy for each symptom. An example of trouble analysis sheets is shown in tables 3-2 and 3-3. The sheets used with the checkout procedures relate to checkout procedures by direct reference or to discrepancies occurring in flight or during ground operations. Each table provides a remedy for each symptom. When the remedy is as simple as replacing a component or making an adjustment, this fact is so stated. When the remedy requires further analysis, the entry in the REMEDY column will be a reference to an applicable paragraph, figure, or possibly another manual. See tables 3-1 and 3-2. 3-15 —