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A 737-300/400/500MAINTENANCE MANUAL
LEAKAGE LOCATION  STAIN  SEEP  HEAVY SEEP  RUNNING LEAK 
Open areas with a good flow of air where fuel leakage cannot move to a possible fire source. For example, the areas of the top and bottom wing surfaces without fairings.  1  1  2  3 
Areas that are not fully closed and do not have a good flow of air. For example, the rear spar at the trailing edge flaps, the front spar at the leading edge flaps or slats, and the wheel wells.  1  maximum Two locations 2  3  3 
has fairings or panels, the nacelle Closed areas without a flow of air. For example, the air conditioning bay, the wing/body fairing, the front spar where it struts , and the refuel station.5  2  3  3  3 
The external space for the fuel boost pump.  1  maximum One location 2  3  3 
The pressurized area of the center section tank.  4  4  4  4 

No repair is necessary. Examine the fuel leak frequently to make sure it
does not become larger.
It is not necessary to repair the fuel leak immediately. Examine the fuel
leak frequently to make sure it does not become larger. Do the necessary
repairs during the next applicable scheduled maintenance.
Repair the fuel leak immediately to a minimum standard of
1 or
2 .
Repair the fuel leak immediately. No fuel leakage is permitted.
If you find fuel leakage from the strut drain line, find the source of the leak. Use this table to evaluate the leak. Repair the leak to the standards given in this table.
Fuel Leak Evaluation
Figure 603 (Sheet 1)

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A 737-300/400/500MAINTENANCE MANUAL
Definitions:
.  A "stain" is a leak where the wet area has a width not more than 1.5 inches after the 15 minute time.
.  A "seep" is a leak where the wet area is not larger than 4 inches after the 15 minute time.
.  A "heavy seep" is a leak where the wet area is not larger than 6 inches after the 15 minute time.
.  A "running leak" is a leak where the wet area is larger than 6 inches after the 15 minute time.
NOTE:____  Monitor the leak area with the talcum powder for fifteen minutes to 
make sure you have the correct leak type and the correct leak posi-
tion. 

Fuel Leak Evaluation
Figure 603 (Sheet 2)

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C96937
A 737-300/400/500MAINTENANCE MANUAL

Backblowing Procedure (Example)
Figure 604

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A 737-300/400/500MAINTENANCE MANUAL
8.0 INCHES
THIS DIMENSION CAN CHANGE
ST982-J

0.38 INCH

TOOLS TO CUT THE SEALANT

0.88 INCH 
ST980A-S-B  ST980A-S-T 
ST980A-S  ST982L 

TOOLS TO REMOVE UNWANTED SEALANT
(SCRAPERS)

Sealant Removal Tools
Figure 605

A54694
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