(10)
The permitted limits of hydraulic line damage caused by dents, chafes, or the corrosion removal process per the corrosion prevention manual, are shown in Fig. 803.
(11)
A repair of a tube section can be in one of three groups. The groups have a relation to the location of the tube damage and the quantity of damage. The three groups are as follows:
(a)
Replace a tube end section that has a flareless end fitting you can move apart, with an assembled tube and fitting assembly (Fig. 806).
(b)
Replace a tube center section that has a short damaged segment with a single union (Fig. 805).
(c)
Replace a tube center section that has very much damage with an assembled tube and fitting assembly (Fig. 809).
(12)
If you disconnected more than one hydraulic tube and you think there is a possibility you connected the tubes incorrectly or cross-connected the tubes, do an operational check:
NOTE: Use your own judgement to determine if a check is necessary.
____
(a) Do the post-installation test of one of more components to which the tubes are connected as a check.
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A
737-300/400/500MAINTENANCE MANUAL
(13) If you disconnected electrical wires to get access to the tubes and you think there is a possibility you connected the wires incorrectly or cross-connected the wires, do an operational check:
NOTE: Use your own judgement to determine if a check is necessary.
____
(a) Do the post-installation test of one of more components to which the wires are connected as a check.
B. Repair of a Tube (Make a Splice)
S 948-134
(1)
Make a decision about the type of repair necessary. Use Fig. 802 to make a decision about the group the repair is in.
S 948-135
(2)
Refer to Fig. 805 to find the necessary tube cutout length when you use a single union to replace a damaged tube area.
S 438-136
(3)
To use assembled tube ends or a center section to do a repair, find the cutout length and install as follows:
(a)
Make an estimate of the total length (L1) of the repair section necessary to replace the damaged tube (see Fig. 806 & 809).
(b)
Cut and trim the repair tube as follows: (see Fig. 804) 1) Use the correct size ratchet chipless cutter. 2) Turn the cutter drive screw counter clockwise to retract
the cutter wheel. 3) Put the cutter over the tube. 4) Turn the screw clockwise until the cutter touches the tube
at the necessary cut location. 5) Turn the screw 1/8 to 1/4 turn and rotate the cutter until
the cutter is easy to rotate. The tube should now be cut. 6) Remove the tool. 7) To deburr the tube use the correct stem subassembly and
deburring tool. To assemble the tool refer to Fig. 804. 8) Push down on the plunger and install the tool into the end of the tube. 9) Release the plunger. Let the plug fill the inside of the
tube. 10) Rotate the deburring tool until the inside burr is removed. 11) Remove the tool with the plug expanded. The expanded plug
should remove metal particles from the inside of the tube.
NOTE: Make sure you do not drop metal particles in the
____ area of the repair.
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(c)
(d)
(e)
(f)
(g)
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