(f)  
Do an inspection for tubes with a cross section that is not fully circular (tubes with ovality). 1) Calculate the percent ovality with this formula:

 percent ovality = OD Max - OD Min X 100% ---------------
OD Nominal
 a)  OD Max is the maximum outer diameter of the tube
 b)  OD Min is the minimum outer diameter of the tube
 c)  OD Nominal is the outer diameter of the tube at a
 position where the tube is circular or almost circular. 2) The percent ovality must not be more than 10% for tubes with a diameter of less than 2 inches. 3) The percent ovality must not be more than 5% for tubes with a diameter of more than 2 inches.
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737-300/400/500MAINTENANCE MANUAL
 (g)  Wrinkles
 1)  The height of a wrinkle is the distance between a straight line that touches the high point of a wrinkle and a straight line that touches the low point of a wrinkle.
 2)  Wrinkles must not have a height larger than the applicable maximum wrinkle height:
 Tube Diameter (inches) Maximum Wrinkle Height (inches) less than 1 .020 1 to 1.99 .030 2 to 2.99 .040 3 or more .050
 S 356-005
 (4)  
Repair or replace all the tubes which have damage that is not permitted (AMM 28-22-15/801, AMM 28-22-15/401).

 S 216-006

 (5)  
Visually examine all the couplings for external indications of these types of damage and make sure the damage is permitted:

 (a)  
Do an inspection for cracks.
 1) No cracks are permitted.

 (b)  
Do an inspection for scratches.

 1)  The scratches in the couplings must not have a depth of more than .004 inches.

 (c)  
Do an inspection for nicks. 1) The nicks in the couplings must have rounded bottoms. 2) The nicks in the couplings must not have a depth of more

 than .004 inches. 3) You must remove all the burrs around the nick.

 (d)  
Do an inspection for worn areas (galling). 1) Worn areas must not have a depth of more than .010 inches. 2) No worn areas in the surfaces that have an O-ring seal are

 permitted.
 S 356-007
 (6)  Repair or replace all the couplings which have damage that is not permitted (AMM 28-22-15/801, AMM 28-22-15/401).
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737-300/400/500MAINTENANCE MANUAL
 FUEL LINE AND COUPLINGS - APPROVED REPAIRS
__________________________________________
 TASK 28-22-15-308-001
 1.  Fuel Line And Coupling Repair_____________________________
 A. General
 (1)  For procedures to repair the fuel line, refer to AMM 20-10-51/801 and OHM 28-00-10.
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 PRESSURE FUELING MANIFOLD CHECK VALVE - REMOVAL/INSTALLATION
____________________________________________________________
 1. General
_______
 A. This procedure has two tasks:
 (1)  
A task to remove the check valve for the pressure fueling manifold.

 (2)  
A task to install the check valve for the pressure fueling manifold.

 TASK 28-22-17-004-001
 2. Pressure Fueling Manifold Check Valve Removal (Fig. 401)
_____________________________________________
 A. References
 (1)  
AMM 28-10-00/201, Fuel Storage

 (2)  
AMM 28-11-11/401, Wing Fuel Tank Access Panels
　
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