W DOC AIRBUS | AMM A320F

Check of the Electrical Bonding of Nose Radome with a Megohmmeter

TASK 20-28-00-720-010-A-02
Check of the Electrical Bonding of Nose Radome with a Megohmmeter

1. Reason for the Job
This alternative test lets you do the check of the continuity between the nose radome and the aircraft structure.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
MEGOHMETER MULTIRANGE
 B. Referenced Information
REFERENCE
DESIGNATION
TASK 20-28-00-720-010-A
Check of the Electrical Bonding of External Composite Panels with a Resistivity - Test Set
TASK 20-28-00-869-002-A
Table of the Maximum Permitted Resistance-Values
TASK 53-15-11-410-001-A
Closing of the Radome
CMM 531511
CMM 531512
3. Job Set-up
Subtask 20-28-00-869-114-A
A. General
   (1) The recommended procedure for the check of the electrical bonding of the external composite panels and the nose radome (with or without non-conductive finish paint on the antistatic paint) uses a resistivity test set (Ref. AMM TASK 20-28-00-720-010).
4. Procedure
Subtask 20-28-00-869-115-A
A. Measurement of the Electrical Resistance for Nose Radome
   (1) Make sure that the nose radome is closed (Ref. AMM TASK 53-15-11-410-001).
   (2) Local paint removal:
     (a) For all the nose radomes (do not include the S2 GLASS nose radome):
  • Remove a small area (approximately 5 mm2 (0.0078 in.2)) of paint from each lightning arrestor strip to get the correct measurement of the ohmic resistance.
NOTE: You can remove a small quantity of paint from the nearest stud of the fuselage, because there is no anti-erosion paint in this area.
     (b) For the S2 GLASS nose radome (P/N 53132110000):
  • Remove a small area (approximately 5 mm2 (0.0078 in.2)) of paint from one stud head of each lightning arrestor strip to get the correct measurement of the ohmic resistance.
NOTE: You can remove a small quantity of paint from the nearest stud of the fuselage, because there is no anti-erosion paint in this area.
   (3) Equipment
     (a) MEGOHMETER MULTIRANGE, with the applicable leads and prods:
  • Diameter 4 MM (0.16 IN.).
  • Set the range to 200 MOHMS.
  • Set the tension to 500 VDC.
   (4) Ohmic resistance measurement:
     (a) For all the nose radomes (do not include the S2 GLASS nose radome):
  • Measure the ohmic resistance between each lightning arrestor strip of the nose radome and the adjacent primary structure of the aircraft.
     (b) For the S2 GLASS nose radome (P/N 53132110000):
  • Measure the ohmic resistance between the applicable stud head of each lightning arrestor strip of the nose radome and the adjacent primary structure.
   (5) Resistance value comparison:
   (6) Remove the test equipment.
   (7) Do a paint touch-up of the stripped area:
     (a) For all types of nose radomes (not applicable to the S2 GLASS nose radome) CMM 531511.
     (b) For the S2 GLASS nose radome only CMM 531512.
5. Close-up
Subtask 20-28-00-942-117-A
A. Make sure that the work area is clean and clear of tools and other items.
[Rev.10 from 2021] 2026.03.31 23:00:13 UTC
"Aviabrain" 2025