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EQUIPMENT AND TOOLS
Determining hose assembly length

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Figure 5-9.—Synthetic rubber medium-pressure hose assembly. PROCEDURES.—When failure occurs in a flexible hose equipped with swaged end fittings, the unit is generally replaced without attempting a repair. The correct length of hose, complete with factory-installed end fittings, is drawn from supply. When failures occur in hose assemblies equipped with reusable style end fittings, the fabrication of the replacement unit is the function of the intermediate and depot organization levels. Undamaged end fittings on the old length of hose maybe removed and reused; otherwise, new fittings must be drawn from supply along with a sufficient length of hose. The following assembly procedures are for instructional purposes only. When fabricating hose assemblies, refer to the Aviation Hose and Tube Manual, NAVAIR 01-1A-20. Hose assembly part number MS 28741-80164 (fig. 5-9), per MIL-H-8795, is used here as an example of fabrication procedures. The first step is to determine the necessary hose length from table 5-2 and figure 5-10. Wrap the circumference of the hose with masking or plastic electrical tape at the cutoff to prevent flare-out of braid if the hose outer cover is wire braid. Hose with rubber or fabric outer cover does not require wrapping Table 5-2.—Hose Cutoff Factor (In Inches) FITTING HOSE SIZE (DASH NUMBER AND/OR LETTER) P/N -3 -4 -5 -6 -8 -10 -12 -16 -20 -24 -32 MS27616 STRAIGHT .92 1.02 1.16 FLARED .70 .74 .77 .81 .93 1.05 1.13 1.30 1.44 1.66 MS28760 .79 .99 1.10 1.19 1.35 1.59 MS18085 .42 .41 .42 .47 .58 .63 .61 .67 .79 .86 MS24587 .60 .60 .70 .77 .94 1.00 1.00 .94 .99 1.09 1.24 MS27404 .46 .55 .68 .73 MS87018 .64 .65 .70 { .76 .94 .99 1.00 1.16 1.34 1.44 1.62 OR M83798/1 .74* .74* .76* .84* 97* 1.05* 1.11* 1.34*    1 .54*    1 .70* NOTES: Cut-off factor for one fitting. * Hose fittings manufactured by Stratoflex (98441) have different cut-off factors, 5-12 MS27053







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