(b)  
Completely dry hidden areas.

 S 796-202
 (15)
 If fuel is drawn into the HeliTest probe, immediately remove it to a safe area and permit it to operate until all the fuel is vaporized.

 (a)  
Disconnect the Visual Probe gas line and permit it to run dry also.

 (b)  
Replace the wet filter on the visual probe tip with a dry filter.

 (c)  
Do not shut the HeliTest off while it is contaminated with fuel because permanent damage can occur.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757 MAINTENANCE MANUAL
 S 796-203
 (16)
 If you do not find the leak, increase the helium pressure to 0.6 psig, and 1.2 psig and so on.

 (a)  
Continue to increase the helium pressure in similar increments until the leak is found.

 NOTE: The compression chamber can hold 2 to 5 psig maximum.
____ The maximum pressure depends on the size of the chamber. A smaller chamber can hold a larger pressure.
 (b)  Do not apply more than 5 psig maximum.
 S 366-204
 (17)
 When you find the leak, repair it with the applicable repair procedure (AMM 28-11-00/801).

 S 366-205

 (18)
 Let the sealant cure to a tack-free condition (AMM 28-11-00/801).

 S 796-206

 (19)
 After the leak repair, do another test of the leak with the HeliTest equipment before you remove the helium chamber or pressure cup from the outside of the tank.

 NOTE: This procedure makes sure the leak was repaired correctly.
____
 S 086-207
 (20)
 Do these steps to put the area back to its usual condition:

 (a)  
Remove the pressure chamber or pressure cup and the tape.

 (b)  
Clean the area around the leak with solvent.

 TASK 28-11-00-796-062
 5. Leak Detection for Fuel Tank Access Doors (Fig. 612)
_________________________________________
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757
MAINTENANCE MANUAL

 A. References
 (1)
AMM 28-11-01/401, Main Tank Access Door
　
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