(1) If the fitting installations do not agree with the specifications listed on the pages that show Fig. 404 and Fig. 405 , install them again or replace them. Then you must do a resistance test again.
NOTE: Do not use bonding jumpers to bridge high-resistance
____ hydraulic installations.
S 764-018
(2) Measure the resistance between the bulkhead fittings and hydraulic tubes as shown in Fig. 407. Make sure the resistance agrees with the specifications given on the page that shows Fig. 404.
RESISTANCE BETWEEN BULKHEAD FITTINGS AND HYDRAULIC TUBE
SIZE TUBE MAXIMUM RESISTANCE (MILLIOHM)
ALUMINUM TITANIUM
PERMASWAGE WELD-ON
-04 ____ 6 12
-06 0.70 4 8
-08 ____ 2.5 5
-10 0.41 1.5 3
Resistance Between Bulkhead Fittings and Hydraulic Tubing
Figure 404
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F60491
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RESISTANCE ACROSS UNION/TEE FITTINGS (TUBE-TO-TUBE)
SIZE TUBE MAXIMUM RESISTANCE (MILLIOHM)
ALUMINUM TITANIUM
-04 ____ 12
-06 1.30 8
-08 ____ 5
-10 0.75 3
Resistance Across Union/Tee Fittings (Tube-To-Tube)
Figure 405
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F60492
A 737-300/400/500MAINTENANCE MANUAL
INSTALLATION TORQUE
TUBE SIZE (INCH) 0.250 0.375 0.500 0.625 0.750 1.000
TITANIUM, CRES TUBE 210 400 750 1050 1350 1800
ALUMINUM TUBE 170 250 420 540 675 1125
Installation Torques for Flareless Fittings in Pressurized Areas
Figure 406
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A 737-300/400/500MAINTENANCE MANUAL
PERMASWAGE BULKHEAD FITTING SCREW TOGETHER WELD-ON BULKHEAD FITTING
Bulkhead Fittings
Figure 407
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F60574
A
737-300/400/500MAINTENANCE MANUAL
S 764-019
(3) Measure the resistance across the in-line union/tee fittings tube-to-tube as show(Fig. 408). Make sure the resistance agrees with the specifications shown on the page that shows Fig. 405.
TASK 20-10-51-404-004
5. Flareless Fittings in Pressurized Areas, Struts, Fuel Tanks, or Cargo Areas -_____________________________________________________________________________ Installation____________
A. Procedure
S 434-021
(1) Make sure the fittings will not leak when they are tight.
Torque the fittings as follows:
NOTE: This procedure is known as the double-torque method.
____
(a)
Tighten the flareless fittings with BACS13AP sleeves two times (tighten, loosen, and tighten again).
(b)
Tighten the flareless fittings with BACS13BX, BACS13BD, welded-on, or NAS1760-type sleeves as follows: 1) Tighten the fitting to the torque shown in Fig. 403. 2) Loosen the fitting to decrease the torque. 3) Tighten to the torque value shown in Fig. 406.
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