-COMPONENTS THAT MOVE.
WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______
GEAR.
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
28-11-00-790-001 Leak Test with Fuel of the Wing-Tank Outer-Cell 28-11-00-790-002 Leak Test with Fuel of the Wing-Tank Outer and Inner
Cells
28-11-00-790-003 Leak Test of the Center Tank
28-11-00-790-004 Leak Test with Fuel of the Vent Surge Tank
28-11-00-790-005 Leak Test of the Wing Tanks and Vent Surge Tank
(without Fuel) by the Local Blowing Procedure
28-11-00-790-006 Leak Test of the Wing Tanks and Vent Surge Tank
(without Fuel) by the Vacuum and Dye Procedure
28-11-00-790-007 Leak Test of the Left Wing and Vent Surge Tanks and the Center Tank (without Fuel) by the Vacuum and Dye Procedure
R 28-11-00-790-008 Leak Test with Fuel of the Wing Tank SIL 57-086 (for corrective action)
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3. Job Set-up
__________
Subtask 28-11-00-210-062
A. General
The causes of fuel leaks are:
-damage of the structure
-damaged or loose fasteners
-incorrect installation of components
-damaged seals, O-rings or sealant.
4. Procedure
_________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
Subtask 28-11-00-790-080
A. Leakage Routing Analysis
(1)
To find the fuel leak, do the applicable leak test as follows:
-
(Ref. TASK 28-11-00-790-001)
-
(Ref. TASK 28-11-00-790-002)
-
(Ref. TASK 28-11-00-790-003)
-
(Ref. TASK 28-11-00-790-004)
-
(Ref. TASK 28-11-00-790-005)
-
(Ref. TASK 28-11-00-790-006)
-
(Ref. TASK 28-11-00-790-007).
(2)
The fuel leak can show a fuel leakage some distance from the source. You must monitor all the possible leakage flow directions, between the external and the internal leak points.
(3)
When fuel comes through a seal, an O-ring or the sealant the adjacent faying surface becomes a wet area. The wet area extends in all directions, until stopped at a prepacked seal or a faying surface seal. The fuel comes through at the point of least resistance.
**ON A/C 301-399,
Subtask 28-11-00-790-080-A
A. Leakage Routing Analysis
(1) To find the fuel leak, do the applicable leak test as follows:
-
(Ref. TASK 28-11-00-790-008)
-
(Ref. TASK 28-11-00-790-003)
-
(Ref. TASK 28-11-00-790-004)
-
(Ref. TASK 28-11-00-790-005)
-
(Ref. TASK 28-11-00-790-006)
-
(Ref. TASK 28-11-00-790-007).
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R R R (2) The fuel leak can show a fuel leakage some distance from the source. You must monitor all the possible leakage flow directions, between the external and the internal leak points.
R R R R (3) When fuel comes through a seal, an O-ring or the sealant the adjacent faying surface becomes a wet area. The wet area extends in all directions, until stopped at a prepacked seal or a faying surface seal. The fuel comes through at the point of least resistance.
R **ON A/C ALL
Subtask 28-11-00-790-081
B. Leakage Rate Analysis
(1) There are three types of fuel leakage. These are related to flight safety and are identified as follows:
(a) Light leakage:
1_ Dry the area of the leak.
2_ After 10 minutes there is a fuel leak indication that does not go more than 100mm (3.94in.) in any direction.
(b) Heavy leakage:
1_ Dry the area of the leak.
2_ After 10 minutes there is a fuel leak indication that is between 100mm (3.94in.) and 180mm (7.09in.) in any direction.
(c) Continuous leakage:
1_ Dry the area of the leak.
2_ After 10 minutes there is a fuel leak indication that is more than 180mm (7.09in.) in any direction.
Subtask 28-11-00-790-082
C. Leakage Type and Location
(1) The correct procedure for the leakage type and location is given in the Table that follows:
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