TM 55-1680-358-12&P SECTION IV.  TROUBLESHOOTING 3-26.  General.  The Helicopter Internal Cargo Handling System is a mechanical roller/conveyor type installation. Any malfunction within the system will be due to a few basic  causes.    The  malfunction  can  be  corrected  by replacement  of  missing  or  damaged  components.    To determine   the   cause   of   a   malfunction,   isolate   the malfunction to a particular area or component.  Visually inspect  the  area  for  broken  or  damaged  parts.    If  this does not easily correct the malfunction, refer to Table 3- 3. 3-27.  Troubles and Remedies.  Refer to Table 3-3 for suggested remedies to the troubles listed. Table 3-3.  Troubleshooting Trouble Probable Cause Remedy Cargo hangs up in one 1.  Inboard rollers or 1a.  Clean Helicopter spot. outboard rollers not Internal Cargo Handling turning freely. System.  (See Chapter 3, Section II.) Internal Cargo Handling 1b.  Lubricate Helicopter System (See Chapter 3, Sec- tion II.) 2.  Sections of Helicopter 2.  Tighten or replace Internal Cargo Handling attaching hardware as System misaligned. required. 3.  Inboard or outboard 3.  Replace roller. roller broken. 4.  Inboard or outboard 4.  Replace roller and/or roller loose. shaft. 5.  Replace protruding head 5.  Contact of the main deck mounting screw and washer outboard guide rail bumper with lower profile head mounting (P/N 18049C202-1, -2, -3) at screw.  (See figure 3-3, index 41, buffer board attachment 42, and 43 for attaching parts). bracket screw head. 6.  The vertical leg of the 6.  Ramp guide rails bent 18325E215 and 18325E216 inboard creating an interference ramp rails may be bent restriction 463L pallet movement outboard using appropriate through the rail. tools (large soft rubber mallet). Rails should not be bent more than necessary in order to achieve 88.00 to 88.09 clearance. Helicopter Internal 1.  Loose 5k tiedown fitting 1.  Tighten as required. Cargo Handling System assemblies, 10k fitting rocks, sways or bows assemblies or tiedown fit- excessively under ting assembly, station load. 360.000. 2.  Loose or broken outboard 2.  Reattach or replace. rail/roller (main deck) hinge, pallet guide hinge, rail/roller main deck offset (outboard) hinge, offset hinge, half hinge, or pallet guide, hatch hinge. Helicopter Internal 1.  Excess friction. 1.  Clean or lubricate. Cargo Handling System (See Chapter 3, Sec- makes excessive noise. tion II.) Change 1 3-83