TM 1-1500-204-23-2 (a) Internal inspection.  The various con- structions of hose assemblies are inspected as follows: 1  Straight hose assemblies.  Insert light at one end and inspect by looking through from the opposite end. 2  Hose assembly with elbow fitting one end.  Insert flexible inspection light into elbow fitting and examine by looking through from the opposite end 3  Hose assembly with elbow fittings both ends.  Insert flexible inspection light into one end and examine from the opposite end using a dental-type mirror.  This procedure is practical on large size hose assemblies only. (b) Other configurations and small size hose assemblies.  Pass a ball of proper size (refer to table 4-13) through the hose assembly to check for restriction or kinking. d.  Instructions for Repair of Flexible Rubber Hose. Replace all defective hose assemblies without attempt- ing repair.  MS28759, MS28762, MS28741, and AN 6270 hose assemblies are field fabricated, and are replaced as a complete unit.  However, fittings from the old hose assemblies should be reused on the new assemblies when they are in good condition All factory assembled hose, or field assembled hose which has been in storage, shall be subjected to pressure test prior to installation in accordance with paragraph 4-5f e.  Instructions for Assembly of High Pressure (3000 psi) Hose Assemblies MS28759 and MS28762. High pressure hose assemblies MS28759 and MS28762 are fabricated from high pressure bulk hose conforming to MIL-H-8788 or MIL-H-8790, and fittings conforming to Military Standards MS28760 and MS28761 (1) Visually check bulk hose.  Visually check bulk hose when hose Is cut for assembly.  Check hose for mutilations, mandrel joints, marks, seams, and ex- cessive graphite (2) Visually check fittings.  Check fittings for   Mutilations, nicks, and distortions caused be overtightening, scratches, or other damage to the cone seat sealing surface.   Backed out retaining wires on swivel nuts.   Mutilation or other damage to threaded areas.   Damage to the finish which would affect the corrosion-resistance of the fitting. NOTE Do not intermix the socket and nipple from one manufacturer with those of another.  All fittings are marked with the manufacturer's symbol Also, do not reuse aluminum sock- ets on high pressure hose fittings. (3) Equipment required.  The following equip- ment is required for field fabrication of high pressure hose assemblies:   Wire brush or soft wire wheel.   6 inch slip-joint pliers.   Knife (leather or linoleum), ground as shown in figure 4-39.   Fine tooth hacksaw.   10,000 psi hydrostatic test machine.   Standard wrenches.   Shop vise. (4) Determine correct length of hose.   Deter- mine correct length of hose required as shown in table 4-14 and figure 4-40.  Cut hose squarely using a fine tooth hacksaw.  Using compressed air, clean hose after cutting to remove all cutting residue. (5) Hose and fittings assembly.  Assemble hose and fittings using following procedures and figure 4-41, steps 1 through 9: 4-38