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IMPROVED RIBBON BRIDGE (IRB)
RAMP BAY M16
NSN 5420-01-470-5825 P/N 12478918;
INTERIOR BAY M17
NSN 5420-01-470-5824 P/N 12478919.
INTRODUCTION TO TROUBLESHOOTING
Operation of a deadlined IRB without preliminary inspection prior
to performing troubleshooting procedures may result in damage to
equipment 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 and
locate the troubleshooting procedure to diagnose the problem.
c. Each troubleshooting procedure lists a description of the malfunction followed by a step or sequence of
steps to check the operation of a component. Then, in the order of probability, substeps instruct the user to
determine if a condition exists through a check, inspection, or test, followed by the corrective action
required to solve the malfunction.
d. Prior to performing any troubleshooting procedure, the following recommendations should be
(1) Check the Equipment Inspection and Maintenance Worksheet, DA Form 2404, and Maintenance
Request Form, DA Form 5504, to find out why the equipment has been deadlined. Note the operators
written description of the problem and, whenever possible, ask the operator; this can save time and effort
in diagnosing the malfunction.
(2) It is best not to assume the operators diagnosis is correct even if it sounds accurate. Always
perform the appropriate troubleshooting procedure(s) to verify the cause of the problem. Performing a
corrective 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 and
perform corrective action in the order listed.
(4) Use approved mechanical, electrical, and hydraulic system repair practices provided in technical
manuals, 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 for
isolating a fault.
(6) Fill out and attach an Exchange Tag, DA Form 2402, to any component that will be exchanged as
a 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 is
not listed in the Mechanical Troubleshooting Symptom Index, WP 0009 00, or Pump System
Troubleshooting Symptom Index, WP 0011 00, notify direct support maintenance.
END OF WORK PACKAGE