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 NOTE: Use your own judgement to determine if a check is necessary.
____
 (a)  Do the post-installation test of one or more of the components to which the wires are connected as a check.
 O. Hydraulic system pressure definitions are below.
 (1)  
Maximum working pressure:

 (a)  Anytime repairs to the tubes are made on the airplane, or when any hydraulic component is to be checked.

 (2)  
Proof Pressure:

 (a) If the tubes are repaired and to be tested in the shop.

 (3)  
Burst Pressure:

 (a)  This is for design reference only.
 P. B-Nut torquing:
 (1)  
The correct torquing can be applied to B-nuts only if the tubing material is identified correctly (aluminum, titanium or steel).

 (2)  
If the normal finish color of the B-nut is covered by the grey drilube coating, a color-coded ring is applied to the back side of the B-nut.

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 ~................................................................. | | | B-NUT (MAY BE | | TUBE | | COVERED WITH | | MATERIAL | TUBE FINISH/COLOR | DRILUBE) | ................................................................... |ALUMINUM |STANDARD 767 - GREEN PRIME |GOLD OR BROWN | ................................................................... |CRES |STANDARD 767 - NO FINISH |SILVER, BRIGHT | ................................................................... |TITANIUM |NO FINISH |DULL GRAY | 2............…................................…...................1
 (3)  
If a steel or titanium B-nut connects to an aluminum tube or fitting, use the lower torque value (aluminum).

 Q.  
To install oxygen system tube assemblies, refer to Chapter 35, Oxygen. You can use this procedure to preset or swage flareless sleeves for oxygen system tube assemblies. You must make sure the oxygen tube assemblies are clean and free of oil (refer to the Component Maintenance Manual Instructions).

 R.  
Use the tube materials as shown in Table I. Use the approved tube materials/tube sizes/tube wall thicknesses as shown in Table IA for 3000 psi hydraulic systems.

 ~............................................................................... | TABLE I | | CROSS REFERENCE OF TUBING TO BMS/MIL SPECIFICATION | ................................................................................. | TUBING MATERIAL | BMS | MIL | OTHER | ................................................................................. |ALUMINUM 6061-T4, 6061-T6 | ---|WW-T-700/6 *[1]| ---| | | | T-7081 | AMS 4083 | ................................................................................. |CRES 21-6-9 | 7-185 | ---| ---| ................................................................................. |1/8 HARD CRES 304-1/8h | ---| T-6845 | AMS 5566 | ................................................................................. |ANNEALED CRES 304 | ---| T-8504 | AMS 5567 | ................................................................................. |ANNEALED CRES 321 | ---| T-8808 | AMS 5556 | | | | | AMS 5557 | ................................................................................. |TITANIUM 3AL-2.5V | 7-234 | ---| AMS 4945 | 2............................…...................…...............…..............1
 *[1] LOW PRESSURE, NON-HYDRAULIC SYSTEMS ONLY
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 ~.............................................................................. | Table IA | | Approved Tube Materials | ................................................................................ | | Tube Size | 04 | 06 | 08 | 10 | 12 | 16 | ................................................................................ |Tube |21-6-9 CRES | 0.016 | 0.020 | 0.026 | 0.033 | 0.039 | 0.052 | |Material |(BMS 7-185) | | | | | | | | ...................................................................... | |3AL-2.5V | 0.016 | 0.019 | 0.026 | 0.032 | 0.039 | 0.051 | | |Titanium | | | | | | | | |(AMS 4945) | | | | | | | | ...................................................................... | |304 1/8 | 0.020 | 0.028 | 0.035 | 0.049 | 0.058 | 0.065 | | |Hard CRES | | | | | | | | |(MIL-T-6845) | | | | | | | | ......................................................................
　
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