28-22-15
 ALL  ú ú 02 Page 607 ú Nov 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 656-029
 WARNING:_______DO THE FUEL TRANSFER PROCEDURE TO REMOVE AIR POCKETS. AIR
 POCKETS CAN CAUSE THE ENGINE TO STOP IN FLIGHT.

 (5) Before the airplane is put back into service, do these steps:
 (a)  
Put fuel into the fuel tanks (AMM 12-11-00/301).

 (b)  
Do this task: Fuel Transfer to Remove Air Pockets from the Engine Fuel Feed Line Adjacent to the Defueling Valve (AMM 28-23-00/201).

 S 796-022
 (6)  Do an engine idle test to do a check for fuel line leaks in the strut area.
 (a)  
Refuel the fuel tanks with the necessary fuel quantity to do the engine motoring procedure (AMM 71-00-00/201).

 (b)  
Refuel the fuel tanks with the necessary fuel quantity to do the engine idle test procedure (AMM 71-00-00/201).

 (c)  
Do this Task: Test No. 2 - Engine Motoring (AMM 71-00-00/501).

 (d)  
Do this Task: Test 2 - Leak Check-Idle Power (AMM 71-00-00/501).

 TASK 28-22-15-206-001
 3.  Engine and APU Feed, Shroud, and Fuel Vent Line and Couplings Dent Criteria___________________________________________________________________________ Check_____
 A.  References
 (1)  
AMM 28-22-15/401, Fuel Lines and Couplings

 (2)  
AMM 28-22-15/801, Fuel Line and Couplings

 B.  Access
 (1)  Location Zones
 218 Aft Cargo Compartment
 221 Center Section Fuel Tank
 303 Left Wing Inboard Leading Edge
 305 Left Fuel Tank
 309 Left Wing Inboard Trailing Edge
 403 Right Wing Inboard Leading Edge
 405 Right Fuel Tank
 409 Right Wing Inboard Trailing Edge

 C.  Procedure
 S 216-002
 (1)  
Visually examine all the fuel tubing to make sure it is tightly and correctly attached.

 S 826-003

 (2)  
Adjust the installation of the tubes which are not correctly attached (AMM 28-22-15/401).

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 28-22-15
 ALL  ú ú 02 Page 608 ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 216-004
 (3)  Visually examine all the fuel tubing for these types of damage and make sure the damage is permitted:
 (a)  
Make an inspection for cracks.
 1) No cracks are permitted.

 (b)  
Make an inspection for dents (areas that are pushed into the tubing). 1) All dents must have an area that is large compared to the

 depth of the dent. 2) No single dent in the tubing is permitted to decrease the diameter of the tube by more than 2.5 percent.
 3)  If there are multiple dents, the total dent depth (individual depths added together) in any section five times the tube diameter long, must be no more than ten percent of the tube diameter.
 4)  The dents in the tubing must be farther than one diameter of the tube from the end of the tube. 5) The dents in the tubing must not have an area of more than
 0.125 square inches.
 6)  If the dent is on the outer part of a bend in the tube, the dent must not have a depth of more than .015 inches.
 (c)  Do an inspection for nicks. 1) The nicks in the tubing must have a rounded bottom. 2) The nicks in the tubing must not have a depth of more than
 0.004 inches.
 3)  You must remove all the burrs from the nick if there are some burrs.
 (d)  
Do an inspection for fretting. 1) Fretting must not have a depth of more than 0.004 inches.

 (e)  
Do an inspection for scoring.

 1)  If you find some small scoring, you can make it smooth again, but obey these conditions: a) The scoring must not be on the outer part of a bend. b) You must not remove more than .004 inches of metal.
　
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