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TROUBLESHOOTING PROCEDURES
TORQUING OF FASTENERS

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Figure 3-10.—A typical multimeter. accordance with the applicable aircraft MIM. Mechanical discrepancies are usually located during the visual inspection in step 1. Electrical malfunctions are located, with the assistance of AEs, by tracing electrical power require- ments throughout the affected system. 6. Correct the trouble. This step is accomplished only after the trouble has been definitely located and there is no doubt that your diagnosis is correct. Mal- functions are usually corrected by replacement of units or components, rigging and adjustments, and bleeding and servicing. NOTE: Always check the applicable MIM for CAUTION, WARNING, and SAFETY notes concerning maintenance procedures. 7. Conduct a final operational check. The affected system must be actuated a minimum of five times, or until a thorough check has been made to determine that its operation and adjustments are satisfactory. TESTING AND OPERATIONAL CHECKS Aircraft systems tests and operational checks should be performed under conditions as nearly operational as possible. Such tests or checks should be performed in accordance with the instructions outlined in the applicable MIM. Make the operational checks in the sequence outlined in the MIM. Any discrepancies you find when performing a step should be corrected before proceeding. The operational check and the troubleshooting charts have been coordinated so that malfunctions can be isolated in an efficient manner. If the troubleshooting aids do not list the trouble being experienced, you will have to study the system schematics and perform the operational check. Use logic and common sense in pinpointing the cause of the malfunction. The test stand to be used in performing the operational check must be capable of producing the required flow and pressure required for proper operation. Check all electrical switches and circuit breakers, as well as hydraulic selector valves, for proper position. Perform this check before applying external electrical and hydraulic power. Perform all maintenance in accordance with the MIM. Observe all maintenance 3-18







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