(4)  
AMM 28-10-00/201, Storage

 (5)  
AMM 28-11-00/801, Integral Fuel Tanks

 (6)  
AMM 28-11-11/401, Wing Fuel Tank Access Panels

 (7)  
AMM 28-11-31/401, Center Tank Access Panel

 (8)  
AMM 28-23-00/201, Defueling

 (9)  
AMM 51-31-00/201, Seals and Sealing

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 ALL  ú ú 01 Page 602 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (10) SRM 51-00-00, Structures
 E. Access
 (1)  Location Zones
 221 Center Section Fuel Tank
 304 Left Surge Tank
 305 Left Fuel Tank
 404 Right Surge Tank
 405 Right Fuel Tank

 F. Do an Analysis of the Fuel Leak Type
 S 226-272
 (1)  
Examine the wet area around the leak source to find the type of leak.

 S 166-273

 (2)  
After you examine the area of the leak, rub the area until it is clean and dry.

 S 226-274

 (3)  
Examine the area of the leak again.

 S 226-275

 (4)  
Refer to Figures 602 and 603 to identify the leak.

 NOTE: The dimension patterns of fuel leaks in these figures are
____ given for an inspection to be made 15 minutes after you rubbed the leak area to dry it.
 S 226-276
 (5)  Make a decision about the type of leakage in the fuel tank.
 (a)  
A "stain" is a leak where the wet area has a width not more than 1.5 inches after the 15 minute time.

 (b)  
A "seep" is a leak where the wet area is not larger than 4 inches after the 15 minute time.

 (c)  
A "heavy seep" is a leak where the wet area is not larger than 6 inches after the 15 minute time.

 (d)  
A "running leak" is a leak where the wet area is larger than six inches after the 15 minute time.

 NOTE: Usually you can see fuel again immediately after you
____ dry the leak area. Drops of fuel can fall from the leak or fuel can flow continuously.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 366-277
 WARNING: MAKE SURE THE FUEL LEAK DOES NOT GO INTO AN IMPORTANT AREA OF
_______ THE AIRPLANE. MAKE SURE THAT LEAKAGE DOES NOT GO INTO THE FUSELAGE AREAS. FUEL LEAKS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (6)  Refer to AMM 28-11-00/801 to find the applicable repair procedure for the leak type that you find.
 G. Find External Leaks with Talcum Powder
 S 286-033
 (1)  Find the exact location of the leak on the airplane skin (Fig. 601).
 NOTE: If the tank is defueled when you start this procedure,
____ refuel the tank and continue this procedure. If it is not possible to refuel the tank completely, you can use the fuel transfer procedure to find the leak. If you change the fuel level in the tank with the leak, it is possible to find the leak more easily. If the tank cannot have fuel in it, refer to procedure: Internal Pressure and Bubble Solution Procedure, in the Task: Alternative Procedures for Fuel Leak Detection.
 (a) Find the area of the skin that is wet with the fuel.
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO
_______ INSTALL THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (b)  If the leak is near the front spar, extend the leading edge flaps and install safety locks (AMM 27-81-00/201).
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE TRAILING EDGE FLAPS.
_______ IF YOU DO NOT DO THE DEACTIVATION PROCEDURE FOR THE TRAILING EDGE FLAPS, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (c)  
If the leak is near the rear spar, extend the trailing edge flaps to get access to the area with the leak and do the deactivation procedure (AMM 27-51-00/201).
　
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