A. General
(1)
This is the recommended procedure for the check of the electrical bonding of an external composite panel with or without non-conductive finish paint on the antistatic paint.
(2)
As an alternative method, and only if there is non-conductive finish paint on the antistatic paint, you can do the check with a megohmmeter (Ref. TASK 20-28-00-720-010).
4. Procedure
_________
Subtask 20-28-00-420-089
A. Check of the Electrical Continuity
(1) Equipment
R (a) The RESISTIVITY - CONTINUITY TEST SET (QB31B) or RESISTIVITY -
R CONTINUITY TEST SET (QB31B1) does a direct check of the electrical continuity between the antistatic paint on composite panels and the aircraft metal structure.
NOTE : You can do this check on panels with or without
____ non-conductive finish paint on the antistatic paint.
NOTE : Make sure that you obey the equipment manufacturer
____ instructions when you use the RESISTIVITY - CONTINUITY TEST SET.
(2)
Set the RESISTIVITY - CONTINUITY TEST SET to mode C1.
(3)
Connect the ground lead between the RESISTIVITY - CONTINUITY TEST SET and the adjacent primary metal structure.
(4)
Connect the lead of probe C1 to the RESISTIVITY - CONTINUITY TEST SET.
(5)
Apply probe C1 to the panel.
(6)
Do the check:
(a)
If the green indicator light comes on:
-there is electrical continuity with the structure and the resistance value is not more than 100 Kohms.
(b)
If the orange indicator light comes on:
-there is electrical continuity with the structure and the resistance value is more than 100 Kohms and less than or equal to 200 Megohms.
(c)
If the red indicator light comes on:
-there is no electrical continuity (or it is not sufficient) and the resistance value is more than 200 Megohms.
(7)
Remove the test set.
5. Close-up
________
Subtask 20-28-00-942-099
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
1EFF : ALL 1 20-28-00Page 526 1 1 Feb 01/03R 1 1 1CES 1
R TASK 20-28-00-720-010- 01
R Check of the Electrical Bonding of External Composite Panels (without R Non-Conductive Finish paint) with a Megohmeter
R 1. Reason for the Job
__________________ R Self Explanatory R 2. Job Set-up Information
______________________
R A. Fixtures, Tools, Test and Support Equipment
R -------------------------------------------------------------------------------R REFERENCE QTY DESIGNATION R -------------------------------------------------------------------------------
R No specific Megohmmeter 200 Megohms - 500 Volts - 1 mA (max.) R No specific Ohmmeter 100 Kohms - 500 Volts - 1 mA (max.)
R B. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R 20-28-00-720-010 R R 20-28-00-869-002
R 3. Job Set-up
__________ R Subtask 20-28-00-869-084 R A. General
Check of the Electrical Bonding of External Composite Panels with a CORAS Resistivity-Continuity Test Set Table of the Maximum Permitted Resistance Values
R (1) The recommended method for the check of the electrical bonding of the R external composite panels with or without non-conductive finish paint R on the antistatic paint, uses a resistivity-continuity test set R (Ref. TASK 20-28-00-720-010).
R (2) This procedure gives an alternative method for the check of the R electrical bonding of an external composite panel, only if there is R no non-conductive finish paint on the antistatic paint.
R 4. Procedure
_________
R Subtask 20-28-00-869-085
R A. Measurement of the Electrical Resistance
R (1) Equipment
R (a) For fairings (but not the antenna fairings and the radome):
R - Ohmmeter 100 Kohms - 500 Volts - 1 mA (max.), with 2
R rounded-point prods, diameter 4 mm (0.1574 in.).
R (b) For antenna fairings and radome:
R - Megohmmeter 200 Megohms - 500 Volts - 1 mA (max.), with 2
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