20-11-05
ALL ú ú 03 Page 817 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 948-317
(7)
Move the Cryolive flareless sleeve/coupling nut/protective cap assembly in the liquid nitrogen (-320 °F) to the repair location.
S 948-318
(8)
Put the tongs into the liquid nitrogen.
S 038-319
(9)
Using cooled tongs, remove the Cryolive flareless sleeve assembly from the liquid nitrogen and allow the excess liquid nitrogen to run off.
S 438-320
WARNING:_______DO NOT PUT GLOVED HAND IN LIQUID NITROGEN. THE LIQUID NITROGEN CAN "WICK" INTO THE GLOVE MATERIAL AND CAUSE INJURY TO YOUR HAND.
(10) Hold the Cryolive flareless sleeve assembly with the gloved hand and immediately slide it on to the tube end until the assembly bottoms on the tube. Ensure that the tube end is visible in the slotted end of the protective cap.
S 438-321
CAUTION: THE TUBE END MUST BE FULLY BOTTOMED AGAINST THE INSIDE END OF
_______ THE CAP SO THAT THE SLEEVE IS CORRECTLY POSITIONED ON THE TUBE END. IF THE TUBE END IS NOT BOTTOMED AGAINST THE INSIDE END OF THE CAP, REMOVE THE PLASTIC CAP AND MEASURE THE TUBE PROTRUSION PER THE "P" DIMENSION REQUIREMENT OF FIGURE 811. IF THE "P" DIMENSION IS INCORRECT, THE INSTALLATION MUST BE REPLACED.
(11)
Allow the Cryolive flareless sleeve to warm and shrink on to the tube.
S 438-322
(12)
When ready to complete final joining/torquing of the coupling nut/Cryolive flareless sleeve to the mating fitting, remove and discard the plastic cap by unscrewing the coupling nut (see Fig. 833).
NOTE: The plastic caps are manufactured from polycarbonate material
____
and may be recycled.
TASK 20-11-05-408-323
8. Install the BACC42W H-Coupling (Fig. 822)
______________________________
A. General
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-11-05
ALL ú ú 03 Page 818 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
WARNING: DO NOT USE BACC42W H-COUPLINGS ON ANY OXYGEN LINES OR ON FLUID
_______ LINES IN THE FIRE ZONES OF THE ENGINES OR APU'S. DAMAGE TO EQUIPMENT OR INJURY TO PERSONS CAN OCCUR.
(1)
The BACC42W H-coupling has a union, coupling, slide, and nut. You can use the H-coupling on fuel and hydraulic high pressure (3000 psi) lines of Ti-3AL-2.5V, CRES 21-6-9, and CRES 304 1/8 hard tubing. This repair is also approved for line repair of CRES 304 annealed and 6061-T6 aluminum lines in 3000 psi or lower pressure applications. You can use this repair on tubing that is installed and in use.
(2)
You can repair defects that have a maximum width of 3/8 inch. You must make splices on larger defects. The minimum workable splice section with two H-couplings and a length of tube is 4.5 inches (Fig. 809).
B. Equipment
(1) Tube Coupling Assembly - BACC42W( ),
(Sierracin/Harrison, 3020 Empire Way, Burbank,
California)
NOTE: The number after the W in the
____
part number gives the size of the
coupling in sixteenths. For example,
BACC42W6 fits 3/8-inch tube size. The
BACC42W is superceded by BACC42W-T which
is used on Ti-3AL-2.5V and all other
hydraulic tubing. You can use BACC42W
on all hydraulic tubes except
Ti-3AL-2.5V.
(2) Consumable Materials
(a)
G00270 Masking Tape
(b)
B01000 Solvent - General Cleaning of Metal
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