W DOC AIRBUS | AMM A320F

Check of the Electrical Bonding of the High Frequency (HF) System

TASK 23-11-00-200-001-A
Check of the Electrical Bonding of the High Frequency (HF) System

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
  • FLUSH IT AWAY WITH CLEAN WATER
  • GET MEDICAL AID.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 261
ZONE: 262
ZONE: 321
ZONE: 322
1. Reason for the Job
To measure the electrical bonding resistance.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 6M (20 FT)
No specific
1
MILLIOHMMETER 0.5 OHM MAX, 10 A MAX - MULTIRANGE
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.06AEA1)
Polysulfide Sealant-Low Adhesion Brushable -
(Material No.08BAA9)
Non Aqueous Cleaner-General - -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
261
AFT CABIN UTILITY AREA
262
AFT CABIN UTILITY AREA
321
DORSAL FIN
322
VERTICAL STABILIZER LEADING EDGE
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 20-28-00-720-005-A
Check of the Electrical Bonding of the Different Components (but not the Fluid Systems and Components Installed on Composite materials)
TASK 23-11-00-710-001-A
Operational Test of the High Frequency (HF) System
TASK 23-11-00-740-001-A
BITE Test of the High Frequency (HF) System
TASK 23-11-36-000-001-A
Removal of the HF Antenna Coupler
TASK 23-11-36-400-001-A
Installation of the HF Antenna Coupler
TASK 25-33-41-000-002-A
Removal of the Aft Galley Unit
TASK 25-33-41-400-002-A
Installation of the Aft Galley Unit
TASK 25-33-42-000-001-A
Removal of the Aft Galley Unit
TASK 25-33-42-400-001-A
Installation of the Aft Galley Unit
TASK 25-33-45-000-001-A
Removal of the Aft Galley Unit
TASK 25-33-45-400-001-A
Installation of the Aft Galley Unit
TASK 53-45-11-000-001-A
Removal of the Dorsal Fin
TASK 53-45-11-400-001-A
Installation of the Dorsal Fin
TASK 55-32-11-000-001-A
Removal of the Vertical Stabilizer Leading-Edge
TASK 55-32-11-400-001-A
Installation of the Vertical Stabilizer Leading-Edge
F HF System - Electrical Bonding of the Coupler Rack ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding of the Antenna or Feeder Assembly ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding of the Antenna ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding of the Fuselage or Circular Plate ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding on the Feeder Connector Support ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding of the Coupler Rack ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding of the Fuselage or Circular Plate ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding of the Feedline ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding of the Coupler Rack ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding of the Feedline ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding of the Antenna ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding of the Antenna or Feeder Assembly ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding of the Fuselage ** ON A/C NOT FOR ALL
F HF System - Electrical Bonding of the Fuselage or Circular Plate ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 23-11-00-941-050-A
A. Put the ACCESS PLATFORM 6M (20 FT) in position at zone 322.
Subtask 23-11-00-010-050-A
B. Get Access
   (1) Remove access panels 321AL and 322AL (Ref. AMM TASK 53-45-11-000-001) and (Ref. AMM TASK 55-32-11-000-001).
Subtask 23-11-00-875-053-A
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUHF11RE1HA14
** ON A/C NOT FOR ALL
121VUCOM NAV/HF21RE2L13
Subtask 23-11-00-869-052-A
D. Tool
   (1) To do this procedure, use the MILLIOHMMETER 0.5 OHM MAX, 10 A MAX - MULTIRANGE, with the related leads and prods as follows:
     (a) Range and output test current:
  • 200 milliohms with an output test current of 10 amperes (for a maximum resistance value of not more than 200 milliohms).
     (b) Accuracy:
  • Plus or minus 10 per cent of the measured value.
Subtask 23-11-00-020-051-A
E. Remove the HF antenna coupler (Ref. AMM TASK 23-11-36-000-001).
4. Procedure
Subtask 23-11-00-820-050-A ** ON A/C NOT FOR ALL
A. Check of the Electrical Bonding of the HF System
   (1) On the coupler rack:
F HF System - Electrical Bonding of the Coupler Rack ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the rack cutout (not painted) and the bonding lead (1).
       1 If the value is less than 2 milliohms:
  • Go to step (2).
       2 If the value is more than 2 milliohms:
  • Remove the screws (2) and the washers.
  • Remove the coupler rack.
  • Remove the screws (3) and the washers.
  • Repair the bonding of the screws (2) and (3) of the coupler rack (Ref. AMM TASK 20-28-00-720-005).
  • Install the coupler rack again with the screws (2) and (3) and the washers.
  • Do step (1) again.
   (2) On the antenna or feeder assembly:
F HF System - Electrical Bonding of the Antenna or Feeder Assembly ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the rack cutout contour (not painted) and the center contact.
       1 If the value is less than 10 milliohms:
  • Go to Para. 4. B.
       2 If the value is more than 10 milliohms:
  • Go to step (3).

   (3) On the antenna:
F HF System - Electrical Bonding of the Antenna ** ON A/C NOT FOR ALL
     (a) Disconnect the feedline (1) from the antenna (4).
     (b) Measure the electrical bonding resistance between the antenna or feedline screw (5) and the bonding lead (2).
       1 If the value is less than 5 milliohms:
  • Go to step (4).
       2 If the value is more than 5 milliohms:
  • Repair the bonding of the screws (3) on the top and bottom of the antenna (4) (Ref. AMM TASK 20-28-00-720-005), and/or
  • Change the feedline (1).
  • Do step (3) again.
     (c) Connect the feedline (1) to the antenna (4).

   (4) Do the operational test of the HF system (Ref. AMM TASK 23-11-00-710-001).
     (a) If the time necessary for the tuning is more than eight seconds:
  • Go to step (5).
     (b) If the time necessary for the tuning is less than eight seconds:
  • Go to Para. 4. B.

   (5) On the fuselage or circular plate (2):
F HF System - Electrical Bonding of the Fuselage or Circular Plate ** ON A/C NOT FOR ALL
     (a) Remove the screws (1) from the circular plate (2).
     (b) Disconnect and isolate the circular plate (2) from the fuselage.
     (c) Measure the electrical bonding resistance between the disk of the coupler rack and the bonding lead (3).
F HF System - Electrical Bonding on the Feeder Connector Support ** ON A/C NOT FOR ALL
       1 If the value is less than 1 milliohm:
  • Go to step (6).
       2 If the value is more than 1 milliohm:
F HF System - Electrical Bonding of the Coupler Rack ** ON A/C NOT FOR ALL
     (d) Clean the component interface and/or the adjacent area with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
CAUTION: DO NOT LET THE SEALANT GO INTO THE HOLE OF THE SCREWS.
     (e) Apply Polysulfide Sealant-Low Adhesion Brushable - (Material No.06AEA1) on the fuselage.
     (f) Clean the holes of the screws (1) with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
     (g) Install the circular plate (2) on the fuselage with the screws (1).
     (h) If necessary, install the aft galley unit (Ref. AMM D/O 25-33-41-40), (Ref. AMM TASK 25-33-41-400-002), (Ref. AMM TASK 25-33-42-400-001), (Ref. AMM D/O 25-33-43-40), (Ref. AMM TASK 25-33-45-400-001) and/or (Ref. AMM D/O 25-33-50-40).
   (6) On the fuselage or circular plate (2):
F HF System - Electrical Bonding of the Fuselage or Circular Plate ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the circular plate (2) and the bonding lead.
       1 If the value is less than 1 milliohm:
  • Go to step (7).
CAUTION: DO NOT LET THE SEALANT GO INTO THE HOLE OF THE SCREWS.
       2 If the value is more than 1 milliohm:
  • Remove the screws (1) from the circular plate (2).
  • Repair the bonding of the screws (1) (Ref. AMM TASK 20-28-00-720-005).
  • Clean the component interface and/or the adjacent area with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
  • Apply Polysulfide Sealant-Low Adhesion Brushable - (Material No.06AEA1) between the fuselage and the circular plate (2).
  • Clean the holes of the screws (1) with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
  • Install the circular plate (2) on the fuselage with the screws (1).
  • Do step (6) again.

   (7) On the antenna or feeder assembly:
F HF System - Electrical Bonding of the Antenna or Feeder Assembly ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the rack cutout contour (not painted) and the center contact.
       1 If the value is less than 10 milliohms:
  • Go to Para. 4. B.
       2 If the value is more than 10 milliohms:
  • Go back to step (1).
Subtask 23-11-00-820-050-B ** ON A/C NOT FOR ALL
A. Check of the Electrical Bonding of the HF System
   (1) On the coupler rack:
F HF System - Electrical Bonding of the Coupler Rack ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the rack cutout (not painted) and the bonding lead (1).
       1 If the value is less than 2 milliohms:
  • Go to step (2).
       2 If the value is more than 2 milliohms:
  • Remove the screws (2) and the washers.
  • Remove the coupler rack.
  • Remove the screws (3) and the washers.
  • Repair the bonding of the screws (2) and (3) of the coupler rack (Ref. AMM TASK 20-28-00-720-005).
  • Install the coupler rack again with the screws (2) and (3) and the washers.
  • Do step (1) again.

   (2) On the feedline:
F HF System - Electrical Bonding of the Feedline ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the two center contacts (HF1 and HF2).
       1 If the value is less than 7 milliohms:
  • Go to step (3).
       2 If the value is more than 7 milliohms:
  • Go to step (4).

   (3) On the antenna or feeder assembly:
F HF System - Electrical Bonding of the Antenna or Feeder Assembly ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the rack cutout contour (not painted) and the center contact.
       1 If the value is less than 10 milliohms:
  • Go to Para. 4. B.
       2 If the value is more than 10 milliohms:
  • Go to step (4).

   (4) On the antenna:
F HF System - Electrical Bonding of the Antenna ** ON A/C NOT FOR ALL
     (a) Disconnect the feedline (1) from the antenna (4).
     (b) Measure the electrical bonding resistance between the antenna or feedline screw (5) and the bonding lead (2).
       1 If the value is less than 5 milliohms:
  • Go to step (5).
       2 If the value is more than 5 milliohms:
  • Repair the bonding of the screws (3) on the top and bottom of the antenna (4) (Ref. AMM TASK 20-28-00-720-005), and/or
  • Change the feedline (1).
  • Do step (4) again.
     (c) Connect the feedline (1) to the antenna (4).

   (5) Do the operational test of the HF system (Ref. AMM TASK 23-11-00-710-001).
     (a) If the time necessary for the tuning is more than eight seconds:
  • Go to step (6).
     (b) If the time necessary for the tuning is less than eight seconds:
  • Go to Para. 4. B.

   (6) On the fuselage or circular plate (2):
F HF System - Electrical Bonding of the Fuselage or Circular Plate ** ON A/C NOT FOR ALL
     (a) Remove the screws (1) from the circular plate (2).
     (b) Disconnect and isolate the circular plate (2) from the fuselage.
     (c) Measure the electrical bonding resistance between the disk of the coupler rack and the bonding lead (3).
F HF System - Electrical Bonding on the Feeder Connector Support ** ON A/C NOT FOR ALL
       1 If the value is less than 1 milliohm:
  • Go to step (7).
       2 If the value is more than 1 milliohm:
F HF System - Electrical Bonding of the Coupler Rack ** ON A/C NOT FOR ALL
     (d) Clean the component interface and/or the adjacent area with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
CAUTION: DO NOT LET THE SEALANT GO INTO THE HOLE OF THE SCREWS.
     (e) Apply Polysulfide Sealant-Low Adhesion Brushable - (Material No.06AEA1) on the fuselage.
     (f) Clean the holes of the four screws (1) with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
     (g) Install the circular plate (2) on the fuselage with the screws (1).

     (h) If necessary, install the aft galley unit (Ref. AMM D/O 25-33-41-40), (Ref. AMM D/O 25-33-41-40), (Ref. AMM D/O 25-33-42-40), (Ref. AMM D/O 25-33-43-40), (Ref. AMM TASK 25-33-45-400-001) and/or (Ref. AMM D/O 25-33-50-40).
   (7) On the fuselage or circular plate (2):
F HF System - Electrical Bonding of the Fuselage or Circular Plate ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the circular plate (2) and the bonding lead.
       1 If the value is less than 1 milliohm:
  • Go to step (8).
CAUTION: DO NOT LET THE SEALANT GO INTO THE HOLE OF THE SCREWS.
       2 If the value is more than 1 milliohm:
  • Remove the screws (1) from the circular plate (2).
  • Repair the bonding of the screws (1) (Ref. AMM TASK 20-28-00-720-005).
  • Clean the component interface and/or the adjacent area with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
  • Apply Polysulfide Sealant-Low Adhesion Brushable - (Material No.06AEA1) between the fuselage and the circular plate (2).
  • Clean the holes of the four screws (1) with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
  • Install the circular plate (2) on the fuselage with the screws (1).
  • Do step (7) again.

   (8) On the feedline (1):
F HF System - Electrical Bonding of the Feedline ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the two center contacts (HF1 and HF2).
       1 If the value is less than 7 milliohms:
  • Go to step (9).
       2 If the value is more than 7 milliohms:
  • Replace the feedline (1).
  • Do step (8) again.
   (9) On the antenna or feeder assembly:
F HF System - Electrical Bonding of the Antenna or Feeder Assembly ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the rack cutout contour (not painted) and the center contact.
       1 If the value is less than 10 milliohms:
  • Go to para. 4. B.
       2 If the value is more than 10 milliohms:
  • Go back to step (1).
Subtask 23-11-00-820-050-E ** ON A/C NOT FOR ALL
A. Check of the Electrical Bonding of the HF System
   (1) On the coupler rack:
F HF System - Electrical Bonding of the Coupler Rack ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the rack cutout (not painted) and the bonding lead (1).
       1 If the value is between 0.3 milliohm and 1 milliohm:
  • Go to step (2).
       2 If the value is less than 0.3 milliohm:
  • Do a check of the setting of the bonding measurement tool and the bonding measurement.
  • Do step (1) (a) again.
       3 If the value is more than 1 milliohm:
  • Remove the screws (2) and the washers.
  • Remove the coupler rack.
  • Remove the screws (3) and the washers.
  • Repair the bonding of the screws (2) and (3) of the coupler rack (Ref. AMM TASK 20-28-00-720-005).
  • Install the coupler rack again with the screws (2) and (3) and the washers.
  • Do step (1) again.
   (2) On the feedline (5):
F HF System - Electrical Bonding of the Feedline ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the two center contacts (HF1 and HF2).
       1 Make sure that the value is between 5.5 milliohms and 7 milliohms.
         a If the value is between 5.5 milliohms and 7 milliohms:
  • Go to step (3).
         b If the value is less than 5.5 milliohms:
  • Do a check of the setting of the bonding measurement tool and the bonding measurement.
  • Do step (2) (a) again.
         c If the value is more than 7 milliohms:
   (3) On the antenna or feeder assembly:
F HF System - Electrical Bonding of the Antenna or Feeder Assembly ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the rack cutout (not painted) and the center contact.
       1 If the value is between 4 milliohms and 8 milliohms:
  • Go to Para. B.
       2 If the value is less than 4 milliohms:
  • Do a check of the setting of the bonding measurement tool and the bonding measurement.
  • Do step (3) (a) again.
       3 If the value is more than 8 milliohms:
  • Go to step (4).
   (4) On the antenna (4):
F HF System - Electrical Bonding of the Antenna ** ON A/C NOT FOR ALL
     (a) Disconnect the feedline (5) from the antenna (4).
     (b) Measure the electrical bonding resistance between the antenna or feedline screw (1) and the bonding lead (2).
       1 If the value is between 1 milliohm and 2 milliohms:
  • Connect the feedline (5) to the antenna (4).
  • Go to step (5).
       2 If the value is less than 1 milliohm:
  • Do a check of the setting of the bonding measurement tool and the bonding measurement.
  • Do step (4) (b) again.
       3 If the value is more than 2 milliohms:
         a Repair the bonding of the screws (3) on the top and bottom of the antenna (4) (Ref. AMM TASK 20-28-00-720-005).
         b Do step (4) (b) again:
  • If the value is between 1 milliohm and 2 milliohms:
    . Connect the feedline (5) to the antenna (4).
    . Do step (3) (a) again.
   (5) On the fuselage or feeder shield:
F HF System - Electrical Bonding of the Fuselage ** ON A/C NOT FOR ALL
     (a) Disconnect the feedline (2) or (3) from the rack.
     (b) Measure the electrical bonding resistance between the feedline shield and the bonding braids of the rear cabin door.
       1 If the value is between 0.7 milliohm and 1.5 milliohms:
  • Connect the feedline (2) or (3) to the rack.
  • Go to Para. B.
       2 If the value is less than 0.7 milliohm:
  • Do a check of the setting of the bonding measurement tool and the bonding measurement.
  • Do step (5) (a) again.
       3 If the value is more than 1.5 milliohms:
  • Go to step (6).
   (6) On the fuselage or circular plate (2):
F HF System - Electrical Bonding of the Fuselage or Circular Plate ** ON A/C NOT FOR ALL
     (a) Measure the electrical bonding resistance between the circular plate (2) and the bonding lead.
       1 If the value is between 0.3 milliohm and 1 milliohm:
       2 If the value is less than 0.3 milliohm:
  • Do a check of the setting of the bonding measurement tool and the bonding measurement.
  • Do step (6) (a) again.
       3 If the value is more than 1 milliohm:
CAUTION: DO NOT LET THE SEALANT GO INTO THE HOLE OF THE SCREWS.
         a Remove the screws (1) from the circular plate (2).
         b Repair the bonding of the screws (1) (Ref. AMM TASK 20-28-00-720-005).
         c Clean the component interface and/or the adjacent area with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
         d Apply Polysulfide Sealant-Low Adhesion Brushable - (Material No.06AEA1) between the fuselage and the circular plate (2).
         e Clean the holes of the screws (1) with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
         f Install the circular plate (2) on the fuselage with the screws (1).
         g Measure again the electrical bonding resistance between the circular plate (2) and the bonding lead.

  • If the value is between 0.3 milliohm and 1 milliohm:
    . Connect the feedline (2) or (3) to the rack.
    F HF System - Electrical Bonding of the Fuselage ** ON A/C NOT FOR ALL
    . Go to Para. B.

  • If the value is less than 0.3 milliohm:
    . Do a check of the setting of the bonding measurement tool and the bonding measurement.
    . Do step (6) (a) again.

  • If the value is more than 1 milliohm:
    . Replace the feedline (2) or (3).
    F HF System - Electrical Bonding of the Fuselage ** ON A/C NOT FOR ALL
Subtask 23-11-00-420-051-A
B. Install the HF antenna coupler (Ref. AMM TASK 23-11-36-400-001).
Subtask 23-11-00-875-054-A
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUHF11RE1HA14
** ON A/C NOT FOR ALL
121VUCOM NAV/HF21RE2L13
Subtask 23-11-00-740-054-A
D. Do the BITE test of the HF system (Ref. AMM TASK 23-11-00-740-001).
Subtask 23-11-00-710-060-A
E. Do the operational test of the HF system (Ref. AMM TASK 23-11-00-710-001).
5. Close-up
Subtask 23-11-00-410-050-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Install access panels 321AL and 322AL (Ref. AMM TASK 53-45-11-400-001) and (Ref. AMM TASK 55-32-11-400-001).
Subtask 23-11-00-942-050-A
B. Remove the access platform(s).
[Rev.10 from 2021] 2026.04.01 04:51:05 UTC
"Aviabrain" 2025