TM 5-5420-278-24&P0064 000064 00-1DIRECT SUPPORT TROUBLESHOOTINGIMPROVED RIBBON BRIDGE (IRB)RAMP BAY M16NSN 5420-01-470-5825 P/N 12478918;INTERIOR BAY M17NSN 5420-01-470-5824 P/N 12478919.MECHANICAL TROUBLESHOOTINGNOTERefer to the general instructions in Introduction toTroubleshooting, WP 0061 00, prior to performing mechanicaltroubleshooting.1.FOLDLOCK WILL NOT ENGAGE OR HOLD WHEN ENGAGEDCheck foldlock catch on outer ponton for excessive wear or damage.Repair or replace catch if excessively worn or damaged.END OF TESTING2.INNER OR OUTER PONTON LEAKINGCheck ponton for structural damage such as cracks, broken welds, or holes.a. Repair visible structural damage by welding; refer to TC 9-237, Welding Theory andApplication.b. After structural damage is repaired, perform ponton leak test (WP 0059 00).END OF TESTING3.LOWER LOCK-DRIVE WILL NOT ENGAGECheck for worn or damaged connecting eyes on inner ponton main lower coupling (interior bayonly) or yoke (ramp bay only).If worn or damaged, repair by welding; refer to TC 9-237, Welding Theory and Application, orreplace lower main coupling (WP 0048 00) or yoke (WP 0030 00).END OF TESTING4.UPPER COUPLING WILL NOT ENGAGE IN RECEPTACLE BLOCKCheck for heavily worn or damaged transverse receptacle block.Notify (EWK) field service.END OF TESTINGDirect Support Mechanical TroubleshootingMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION
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