(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
A 737-300/400/500MAINTENANCE MANUAL
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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