TM 5-5420-278-24&P0007 000007 00-1/2 blankUNIT TROUBLESHOOTINGIMPROVED RIBBON BRIDGE (IRB)RAMP BAY M16NSN 5420-01-470-5825 P/N 12478918;INTERIOR BAY M17NSN 5420-01-470-5824 P/N 12478919.INTRODUCTION TO TROUBLESHOOTINGGENERALWARNINGOperation of a deadlined IRB without preliminary inspection priorto performing troubleshooting procedures may result in damage toequipment or injury to personnel.a. This chapter provides the necessary troubleshooting procedures to diagnose mechanical, electrical,and hydraulic system malfunctions of the IRB.b. The symptom index has its own work package number and is used to identify the malfunction andlocate the troubleshooting procedure to diagnose the problem.c. Each troubleshooting procedure lists a description of the malfunction followed by a step or sequence ofsteps to check the operation of a component. Then, in the order of probability, substeps instruct the user todetermine if a condition exists through a check, inspection, or test, followed by the corrective actionrequired to solve the malfunction.d. Prior to performing any troubleshooting procedure, the following recommendations should beobserved:(1) Check the Equipment Inspection and Maintenance Worksheet, DA Form 2404, and MaintenanceRequest Form, DA Form 5504, to find out why the equipment has been deadlined. Note the operator’swritten description of the problem and, whenever possible, ask the operator; this can save time and effortin diagnosing the malfunction.(2) It is best not to assume the operator’s diagnosis is correct even if it sounds accurate. Alwaysperform the appropriate troubleshooting procedure(s) to verify the cause of the problem. Performing acorrective action without proof of a fault wastes time and increases the maintainability of the equipment.(3) Always first isolate the system where the malfunction occurs, then locate the component andperform corrective action in the order listed.(4) Use approved mechanical, electrical, and hydraulic system repair practices provided in technicalmanuals, field manuals, and technical bulletins listed in WP 0082 00 of this manual.(5) Use the approved special tools and test equipment to determine the known parameters forisolating a fault.(6) Fill out and attach an Exchange Tag, DA Form 2402, to any component that will be exchanged asa core and turned in for repair or rebuilding at the direct support or general support maintenance level.e. This chapter lists the most common malfunctions that may occur. When a malfunction occurs that isnot listed in the Mechanical Troubleshooting Symptom Index, WP 0009 00, or Pump SystemTroubleshooting Symptom Index, WP 0011 00, notify direct support maintenance.END OF WORK PACKAGE
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