TM 5-5420-278-24&P
0010 00
0010 00-2
2.
BAY WILL NOT FOLD AUTOMATICALLY DURING RETRIEVAL
Step 1. Check to see inner-to-inner ponton upper couplings are unlatched.
Unlatch upper couplings (TM 5-5420-278-10).
Step 2. Check to see ponton swivel hooks are disengaged (ramp bay only).
Disengage swivel hooks (TM 5-5420-278-10).
Step 3. Check to see outer ponton locks are released (interior bay only).
Release outer ponton locks (TM 5-5420-278-10).
Step 4. Check for loose or broken cable assembly.
a. If loose, adjust cable (WP 0020 00 or WP 0040 00).
b. If broken or stretched, replace cable (WP 0020 00 or WP 0040 00).
Step 5. Check for obstructions or jamming caused by rocks or debris.
Free and remove obstruction.
Step 6. Check for broken torsion bar turnbuckle (ramp bay only).
If broken or damaged, replace torsion bar turnbuckle (WP 0022 00).
Step 7. Check for water in outer pontons.
If outer pontons have water, pump out pontons (TM 5-5420-278-10).
END OF TESTING
3. FOLDLOCK WILL NOT ENGAGE OR HOLD WHEN ENGAGED
Step 1. Check for bent foldlock spring holder or damaged springs (ramp bay only).
Straighten foldlock spring holder if bent, and replace springs if damaged (WP 0029 00).
Step 2. Check for missing or damaged foldlock springs (interior bay only).
Replace missing or damaged springs (WP 0026 00).
Step 3. Check for bent foldlock lever and support brackets.
Straighten support brackets if bent or binding, and replace bent lever (WP 0029 00
or WP 0046 00).
Step 4. Check foldlock catch on outer ponton for wear, or if bent or damaged.
Repair or replace catch if worn or damaged. Notify direct support maintenance.
END OF TESTING
4.
INNER OR OUTER PONTON LEAKING
Step 1. Check for loose, damaged, or missing bilge plugs and bilge plug seals.
a. Tighten loose bilge plugs (TM 5-5420-278-10).
b. Replace missing or damaged bilge plugs and seals (WP 0053 00).
Step 2. Inspect ponton for structural damage such as cracks, broken welds, or holes.
a. Repair visible structural damage by welding; notify direct support maintenance.
b. If no visible structural damage can be found, perform ponton leak test (WP 0059 00).
END OF TESTING
Unit Mechanical Troubleshooting (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
