TM 1-1500-204-23-2
Table 4-10. Hose Clamp Tightening, Fingertight-Plus Turns Method
Clamps, Radial
Instal Installation
Clamp, worm screw-type
and other type
only
(10 threads per Inch)
(28 threads per Inch)
Self-Sealing Hose
Fingertight Plus 2
Fingertight Plus 2 1/2
Complete Turns
Complete Turns
Approximately 25 to 30
Inch-Pounds
All Other Aircraft Hose
Fingertight Plus 1 1/2
Fingertight Plus 2
Approximately 25 to 30
Complete Turns
Complete Turns
Inch-Pounds
30 inch-pounds, component parts of connection shall be
examined and unserviceable parts replaced.
(c) Hose clamps installed on rubber nipple-
type fuel cell fittings and fuel system molded rubber
connections shall be tightened to a torque of 15 inch-
pounds for original installation, and maintained at finger-
tight plus 1 1/4 turns. Fuel cell fittings are very easily
damaged by hose clamps; therefore, these torque
values shall be followed.
(d) As an alternate method, hose clamps may
be tightened with a special hose clamp tool easily
fabricated from a long midget socket (figure 4-32) A slot
is cut through hex end of socket wide enough and deep
enough to accommodate thumbscrew portion of hose
clamp. This type of tool may be used on the end of a
ratchet or extension.
c. Repair of High-Pressure Tubing Assemblies
High-pressure tubing assembly can be repaired either
by removal of the damaged section and a union in-
stalled, or by replacement of the entire tubing assembly.
(1) Repair. The damaged portion of tubing is
cut out and removed (see figure 4-33). The ends of the
remaining tubing are cleaned and deburred. If the
damaged section of the tubing does not exceed the
length of a union, a new tube section is not needed.
(2) Replacement. If a tubing assembly Is to be
replaced, fittings can usually be salvaged and replacing
assembly will amount to replacement of tubing only. If
tubing is small and made of soft material, assembly may
be formed during installation by hand bending. How-
ever, if tubing is of such material and size that hand
bending is impractical, care shall be taken to remove
assembly without further damage or distortion so that it
can be used as a forming template. This will allow
duplication as to length, bends, and angles. All tubing
for replacement in low pressure oxygen systems shall
Figure 4-32. Tightening Hose Clamp with Socket
4-30
