S 218-188

 (18)
 Examine the completed repair to make sure you can see the two marking dots (Fig. 822). If you cannot see the two dots, this shows that the sleeve and coupling are not fully seated against the center land of the union.

 S 218-189

 (19)
 Make sure dimension "C" did not increase.

 S 208-190

 (20)
 Do an inspection as follows:

 (a)  
Remove the nut.

 (b)  
Make sure the slide and coupling are no more than 0.015 inch from the union shoulder.

 (c)  
Make sure the union touches the tape.

 (d)  
If the clearance between the slide or coupling and the union is more than 0.015 inch, install the nut and tighten it until you get the necessary clearance (Fig. 822).

 (e)  
Install the nut again and tighten the nut to the necessary torque value.

 (f)  
If the union does not touch the tape, you must remove the coupling and a sufficient tube length. Install a new repair section.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 TASK 20-10-51-408-191
 8.  Install the 3P02111 or 3PHS111 Cryofit Coupling (Fig. 823)_______________________________________________
 A. General
 WARNING: DO NOT USE CRYOFIT COUPLINGS ON ANY OXYGEN LINES OR ON FLUID
_______ LINES INSIDE THE FIRE ZONES OF ENGINES OR APU'S. DAMAGE TO EQUIPMENT OR INJURY TO PERSONS CAN OCCUR. THE CRYOFIT COUPLING IS NOT QUALIFIED FOR THESE APPLICATIONS.
 WARNING:_______USE EXTREME CAUTION WHEN USING LIQUID NITROGEN. THE TEMPERATURE OF LIQUID NITROGEN IS 320 DEGREES BELOW ZERO. PROVIDE PROPER VENTILATION AS LIQUID NITROGEN VAPORS CAN DISPLACE OXYGEN IN CONFINED AREAS. USE SAFETY GLASSES, A FACE SHIELD, AND INSULATED GLOVES WHEN USING LIQUID NITROGEN. MISSUSE OF LIQUID NITROGEN CAN CAUSE INJURY TO PERSONS.
 WARNING: SLOWLY AND CAREFULLY SUBMERGE WARM ITEMS IN LIQUID NITROGEN TO
_______ PREVENT RAPID BOILING OFF AND SPLASHING. MISSUSE OF LIQUID NITROGEN CAN CAUSE INJURY TO PERSONS.
 (1)  
The Cryofit coupling is a fitting which you can use to repair Ti-3AL-2.5V tubing as shown in Fig. 802. To install the fitting in a straight section, shrink fit it in its position.

 B.
Equipment

 (1)  
(commercially available) Safety Glasses

 (2)  
(commercially available) Face Shield

 C.
Consumable Materials

 (1)  
G00262 Liquid nitrogen

 (2)  
B01000 Solvent - General Cleaning of Metal
 (Series 80)

 (3)  
A00558 Loctite 290

 (4)  
G00270 Masking Tape

 D.
Procedure

 (1)
Remove pressure from the systems where you will do repairs.

 S 868-192
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 118-193
 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (2)  
Use solvent, Series 80 (AMM 20-30-80/201) to clean the tube in the area where you will install the Cryofit coupling.

 S 438-194

 (3)
Use tape to make a mark on the tube to make sure you put the Cryofit

 coupling over the center of the tube repair.
 (4)  S 328-195Cut the tube.
 (5)  S 118-196Chamfer and remove burrs from the ID and OD edges. with solvent, Series 80 (AMM 20-30-80/201). Clean the edges
 S 948-197

 WARNING:_______USE EXTREME CARE WHEN USING LIQUID NITROGEN. THE TEMPERATURE OF LIQUID NITROGEN IS 320 DEGREES BELOW ZERO. PROVIDE PROPER VENTILATION AS LIQUID NITROGEN VAPORS CAN DISPLACE OXYGEN IN CONFINED AREAS. USE SAFETY GLASSES, A FACE SHIELD, AND INSULATED GLOVES WHEN USING LIQUID NITROGEN. MISSUSE OF LIQUID NITROGEN CAN CAUSE INJURY TO PERSONS.
　
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