(2)
Remove the surface protection (Alodine paint, etc.) from the contact zone with a abrasive paper glass type 1 or grade 200 emery cloth. The cleaned areas must be such that after assembly they give a zone between 1 mm (0.0393 in.) and 4 mm (0.1574 in.) around the contact faces.
NOTE : You can bond all the cadmium plated steel or conductive parts
____ without removal of the surface protection and without application of sealant (this does not include the tanks).
Subtask 20-28-00-916-095
C. Temporary Protection of the Contact Areas
(1) If you cannot make the connection in less than four hours apply COMMON GREASE (Material No. 04-012) on the surface without a surface protection. Before the connection clean with a MISCELLANEOUS (Material No. 19-003) moist with CLEANING AGENTS (Material No. 11-004).
Subtask 20-28-00-110-104
D. Cleaning of the Contact Areas
(1) Clean the surface without a surface protection and the attachment with a lint free cloth moist with CLEANING AGENTS (Material No. 11-004).
4. Procedure
_________ Subtask 20-28-00-914-055
A. Protection of the Bonding
(1) Apply a layer of SEALANTS (Material No. 09-019) on the surface without protection.
(2)
Make sure that the surfaces without protection are fully sealed. Subtask 20-28-00-420-093
B.
Install the bonding connection. Subtask 20-28-00-914-056
C. Seal the body of the bonding connection with SEALANTS (Material No. 09-016)
Subtask 20-28-00-720-092
D. Make sure that the ohmic resistance is correct (Ref. TASK 20-28-00-869-002).
5. Close-up
________ Subtask 20-28-00-942-109
A. Make sure that the work area is clean and clear of tool(s) and other items.
ELECTRICAL BONDING - ADJUSTMENT/TEST
____________________________________ TASK 20-28-00-869-002 Table of the Maximum Permitted Resistance Values
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
20-28-00-720-005
20-28-00-720-006
20-28-00-720-008
20-28-00-720-010
20-28-00-720-010
20-28-00-720-011
20-28-00-720-011
20-28-00-720-011
20-28-00-720-012
R 20-28-00-720-014
3. Job Set-up
__________ Subtask 20-28-00-941-062
A. Not Applicable
Check of the Electrical Bonding of the Different Components (But not the Fluid Systems and the Components Installed on Composite materials)Check of the Electrical Bonding of the Fluid SystemsCheck of the Electrical Bonding of the Different Components Installed on Composite MaterialsCheck of the Electrical Bonding of External Composite Panels with a CORAS Resistivity-Continuity Test SetCheck of the Electrical Bonding of External Composite Panels (without Non-Conductive Finish paint) with a MegohmeterMeasurement of the Surface Electrical Resistance of External Composite Panels with a CORAS Resistivity-Continuity Test SetMeasurement of the surface Electrical Resistance of External Composite Panels (without Non-Conductive Finish Paint) with Electrical Conductive TapeMeasurement of the Surface Electrical Resistance of External Composite Panels (without Non-Conductive Finish Paint) with ProbesCheck of the Aircraft Electrical Grounding Loop Impedance Test
4. Procedure
_________
Subtask 20-28-00-869-075
A. Table of Maximum Resistance Values
(1) Primary structure
(Ref. TASK 20-28-00-720-005)
(a) The values given are for measurement between the primary metal structure of Frame 1 and a metal part of the points that follow:
-------------------------------------------------------------------------------| POINT LOCATION | TASK | MAX. PERMITTED | | | REFERENCE | RESISTANCE VALUE| --------------------------------------|----------------------------------------| - end of the wing | 20-28-00-720-005 | 2 milliohms | | | | | | - end of the rear fuselage | 20-28-00-720-005 | 2 milliohms | | | | | | - end of the THS | 20-28-00-720-005 | 5 milliohms | | | | | | - lower part of the vertical | 20-28-00-720-005 | 5 milliohms | | stabilizer | | | | | | | | - engine structure | 20-28-00-720-005 | 2 milliohms | | | | | | - APU structure | 20-28-00-720-005 | 5 milliohms | -------------------------------------------------------------------------------
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