(2)
Alternative Procedures for Fuel Tank Leak Detection
(3)
Helitest Leak Detection
(4)
Leak Detection for the Fuel Tank Access Doors
(5)
Leak Detection for the Dry Bay
(6)
Leak Path Analysis
(7)
Dry Bay Leak Detection and Repair Aids
B.
The task: Fuel Tank Leak Detection and Repair, has these general procedures:
(1)
Find the external leak and leak type.
(2)
Use the backblowing procedure to find the leak path and the internal leak.
(3)
Remove the sealant that has the leak.
(4)
Apply new sealant on the internal leak location.
(5)
Do a test to make sure you repaired the leak correctly.
C.
More data about the repair of integral fuel tanks is in AMM 28-11-00/801.
D.
If there is indication of damage to the secondary fuel barrier, you must find and repair the leakage in the fuel tank and in the secondary fuel barrier (AMM 28-11-00/801) before the airplane can be released for flight.
NOTE: The most usual indication of such damage is a report of fuel
____
fumes in the passenger cabin.
TASK 28-11-00-206-001
2. Fuel Tank Leak Detection, Analysis, and Repair
______________________________________________
A. Equipment
(1)
ST8744 - vacuum cup, to find bad fasteners (optional)
(2)
Tools - for sealant removal and application (Fig. 604, 607).
(3)
Brushes - to apply the precoat and the primer (corrosion resistant finish)
(4)
Markers - non-lead, Berol filmograph to mark in the tank, Berol hydromarker to mark out of the tank (or equivalent)
(5)
Source - air pressure, 100 psi maximum
(6)
Source - vacuum, 10 psi (optional)
(7)
Flashlight - Explosion-proof
(8)
Gloves - neoprene or rubber (commercially available)
(9)
Gun - to apply sealant (optional)
B.
Consumable Materials
(1)
A00701 - BMS 5-26 Type II, Class A sealant, for the precoat
(2)
A00702 - BMS 5-26, Type II, Class B, to apply with a spatula or sealant gun
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28-11-00
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