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3. Job Set-up
__________
Subtask 20-23-11-917-070
A. General
(1) This approved repair procedure permits to repair hydraulic tubes in TI 3AL 2.5 V titanium alloy.
NOTE : This repair procedure uses a tube swaging method by internal
____ rolling. It is not applicable to corrosion-resistant steel or aluminum-alloy tubes.
(2)
The use of HARRISON sleeve and union permits to make a separable connection between two tubes or between a tube and a system component.
(3)
The unions, sleeves and sleeve nuts applicable for this repair procedure are:
-unions ASN-A3760,
-sleeves ASN-A3759,
-sleeve nuts ASN-A3769-T or MS 21 921-T.
(Ref. Fig. 252/TASK 20-23-11-991-045)
(4)
To repair the tube with HARRISON sleeve and union, you must:
-cut the tube and remove the damaged section,
-square and deburr the ends of the tubes,
-clean the tubes,
-install the sleeve nut, the sleeve and the union on the tubes,
-swage the tubes into the sleeve and the union,
-connect the ends of the tubes with the sleeve, the nut and the union.
NOTE : You must remove the tube to swage it.
____
(5) You must use the applicable HARRISON roller swaging tools to swage the tube.
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Connection of Tubes with HARRISON Fittings Figure 252/TASK 20-23-11-991-045
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4. Procedure
_________
Subtask 20-23-11-917-068
A. Preparation of the Tube
(1) Cut the tube and remove the damaged section:
-determine the tube length and take into account the tube protrusion from the sleeve D and the tube growth after swaging delta L, (Ref. Fig. 253/TASK 20-23-11-991-046)
-make sure that the length of the straight section of the tube immediately after the bent section is the minimum necessary for the swaging operation. (Ref. Fig. 226/TASK 20-23-11-991-021)
NOTE : If the damaged section is too large or too near a bend, you
____ can replace the damaged section by another tube. In this case, you must use two HARRISON fittings.
(2)
Carefully square, deburr and chamfer the ends of the tubes, internally and externally. (Ref. Fig. 227/TASK 20-23-11-991-022)
(3)
Clean the tube with CLEANING AGENTS (Material No. 11-003) and blow air through the tube to remove all swarf and impurities.
(4)
Accurately measure the tube thickness. Write this value to do the check of the swage.
(5)
Make sure that the tube thickness is in the permitted tolerance (E). (Ref. Fig. 254/TASK 20-23-11-991-047, 255/TASK 20-23-11-991-048)
Subtask 20-23-11-917-071
B. Preparation of the Swage Tools
(1) Make sure that the roller swage machine is in this configuration:
-power switch OFF,
-calibration switch on RUN,
-jaw select switch on RELEASE,
-thumb wheel switch on O.O.O.,
-swage machine clear of swage tools and other items,
-air pressure source 5.6 bar (81.2211 psi) min. connected to the swage machine,
-electrical power supply connected to the swage machine.
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Tube Protrusion and Tube Growth Figure 253/TASK 20-23-11-991-046
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Dimension Acceptance Criteria for ASN-3759 Sleeves Figure 254/TASK 20-23-11-991-047
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Dimension Acceptance Criteria for ASN-3760 Unions Figure 255/TASK 20-23-11-991-048
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(2)
Do a trial run at no load:
(a)
Put the power switch in the ON position.
(b)
Put the jaw select switch in the LOCK position.
(c)
Push the power on button and make sure that:
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