W DOC AIRBUS | AMM A320F

Electrical Bonding - General Maintenance Procedure

TASK 20-28-00-912-802-A
Electrical Bonding - General Maintenance Procedure

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the Job
This task gives general bonding process and the cross-references to:
  • The procedure to do the electrical bonding of components (preparation, cleaning, assembly and protection).
  • The table of maximum resistance values which gives the cross references to different measurement methods.
  • The procedure to do detailed inspection on bonding lead installed on movable surfaces.
2. Job Set-up Information
 A. Consumable Materials
REFERENCE
DESIGNATION
(Material No.08BAA9)
Non Aqueous Cleaner-General - -
(Material No.14SBA1)
Textile-Lint free Cotton -
 B. Referenced Information
REFERENCE
DESIGNATION
TASK 20-28-00-869-002-A
Table of the Maximum Permitted Resistance-Values
TASK 20-28-00-912-803-A
Bonding Surface Preparation
TASK 20-28-00-912-804-A
Bonding Point Temporary Protection
TASK 20-28-00-912-805-A
Assembly of Components for Bonding
TASK 20-28-00-912-806-A
Bonding Final Protection
ESPM 205120
F Bonding Process - Flow Chart
3. Job Set-up
Subtask 20-28-00-941-064-A
A. There is no special job set-up for this task.
4. Procedure
Subtask 20-28-00-010-052-A
A. Definition
Electrical bonding is a process to make a current path between electrically conductive parts to make sure that there is electrical continuity. This path can be between:
  • Two structural Parts
  • A system point and the structure.
Subtask 20-28-00-010-053-A
B. General Bonding Principle
F Bonding Process - Flow Chart
Do the bonding procedure during the installation of the equipment or the part assembly (access doors, fairings, antenna, fittings or pipes etc.) after the removal.
To do the electrical bonding, do the steps that follow:
  • Prepare the bonding surfaces
  • Apply temporary protection (if necessary)
  • Assemble the different parts of the assembly
  • Find the correct value of the ohmic resistance
  • Do a check of the ohmic resistance value
  • Apply the final protection on the bonding assembly (if applicable).
Subtask 20-28-00-912-071-A
C. Bonding Surface Preparation
   (1) Prepare the bonding surfaces (Ref. AMM TASK 20-28-00-912-803).
   (2) If it is not possible to install the part or equipment in 1 week or less after the removal:
NOTE: This step is not necessary for:
  • Composite access panels and the fairings
  • Titanium and corrosion-resistant steel parts (Non corrosion materials).
Subtask 20-28-00-400-050-A
D. Equipment Assembly
   (1) If the bare surfaces are protected with temporary protection materials, remove temporary protection material with Non Aqueous Cleaner-General - - (Material No.08BAA9) and a Textile-Lint free Cotton - (Material No.14SBA1) .
   (2) Assemble the fasteners (nuts, bolts, screws, washers etc.), bonding leads, clamp or the equipment.
To do this, refer to the instructions as follows:
     (a) For electrical connectors, Refer to ESPM 205120.
     (b) For all other components (Ref. AMM TASK 20-28-00-912-805).
Subtask 20-28-00-760-050-A
E. Electrical Resistance Measurement
   (1) Refer to the table of maximum ohmic resistance-values (Ref. AMM TASK 20-28-00-869-002).
The table gives information of:
  • The maximum permitted value
  • The applicable measurement test.
   (2) If the measured value is less than the maximum permitted value:
  • Apply final protection to the bonding assembly (go to paragraph final protection).
   (3) If the measured value is more than the maximum permitted value, do the bonding surface preparation, the equipment assembly and the electrical resistance measurement again.
Subtask 20-28-00-916-096-A
F. Final Protection
   (1) Apply final protection (Ref. AMM TASK 20-28-00-912-806).
[Rev.10 from 2021] 2026.04.01 03:57:00 UTC
"Aviabrain" 2025