28-11-00
ALL ú ú 01.1 Page 624 ú Sep 28/02
A
757
MAINTENANCE MANUAL
S 416-032
(6) If you removed some skin panels to get access to the external leaks, install them again.
TASK 28-11-00-796-033
3. Alternative Procedures for Fuel Tank Leak Detection
___________________________________________________
A. General
(1)
The best leak detection procedure is usually this procedure: Fuel Tank Leak Detection and Repair. This procedure finds the leak externally with talcum powder. Then it finds the internal leak with the air pressure and soap bubble procedure ("backblowing").
(2)
This task contains alternative procedures used to find a leak. These procedures can be used if backblowing is not possible, or if it fails to show all of the leaks.
(3)
Before you defuel a fuel tank which has a leak, try to find all of the leaks in the fuel tank. Repair all leaks each time a fuel tank is defueled to repair leaks.
B.
Equipment
(1)
Tracing Device - Integral Fuel Tank Leak F71329
(2)
Explosion-proof flashlight
(3)
Adapter Assembly - Fuel Leak Tracing Hollow
Bolt F70206-1
(4)
Pressure Plug Equipment - B28005-1
(5)
Water Manometer Assembly - F72951-1
(6)
Air pressure capable of 4 psig (commercially available).
(7)
Air pressure capable of 90 to 100 psig (commercially available).
(8)
Markers - non-lead, Berol filmograph to mark in the tank, Berol hydromarker to mark out of the tank (or equivalent)
C.
Consumable Materials
(1)
C00069 Dye, Automate Red BSF
D.
References
(1)
AMM 28-11-01/401, Main Tank Access Door
(2)
AMM 28-11-02/401, Center Tank Access Door
(3)
AMM 28-11-03/401, Surge Tank Access Door
(4)
AMM 28-26-00/201, Defueling
E.
Access
(1)
Location Zones
133 Wing Center Section (Left)
134 Wing Center Section (Right)
531 Center Wing Tank (Left)
541 Main Tank-Rib No. 5 to No. 17 (Left)
542 Main Tank-Rib No. 17 to No. 21 (Left)
543 Surge Tank-Rib No. 21 to No. 23 (Left)
631 Center Wing Tank (Right)
641 Main Tank-Rib No. 5 to No. 17 (Right)
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