W DOC AIRBUS | AMM A320F

Installation of the Traffic Alert and Collision Avoidance System (TCAS) Antenna

TASK 34-43-11-400-004-E
Installation of the Traffic Alert and Collision Avoidance System (TCAS) Antenna

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 130
ZONE: 230
FIN: 7SG1 ** ON A/C NOT FOR ALL
FIN: 7SG2 ** ON A/C NOT FOR ALL
1. Reason for the Job
Self explanatory
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
Torque wrench: range to between 0.37 and 0.27 m.daN (32.74 and 23.89 lbf.in ) T
No specific
Torque wrench: range to between 4.8 and 3.7 m.daN (35.40 and 27.29 lbf.ft ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.04JAA3)
Top Coat Polyurethane_- - External Structure
(Material No.04QAB2)
Coating_- Flexible Structure
(Material No.04TMB2)
Varnish-- Electrical Bonding Structure
(Material No.06AAB1)
Polysulfide Sealant-General Purpose Fillet -
(Material No.06AEB2)
Polysulfide Sealant-Low Adhesion Fillet Structure
(Material No.08BAA9)
Non Aqueous Cleaner-General - -
(Material No.14DBB1)
Release Agent-- Liquid Wax -
(Material No.14SBA1)
Textile-Lint free Cotton -
No specific
corrosion-resistant-steel lockwire 0.4 mm (0.015 in.) dia
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
130
FWD CARGO COMPT AFT BULKHEAD OF AVNCS COMPT TO FWD PRESSURE BULKHEAD OF WING CENTER BOX
230
FWD PASSENGER COMPARTMENT
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
3
TEFLON GASKET
AIPC 34-43-11-01-010
4
PREFORMED PACKING
AIPC 34-43-11-01-020
12
SEAL
AIPC 34-52-11-01-010
 E. Referenced Information
REFERENCE
DESIGNATION
TASK 20-28-00-912-802-A
Electrical Bonding - General Maintenance Procedure
TASK 34-72-00-740-001-A
BITE Test of the T/TISS
F Top Traffic Alert and Collision Avoidance System (TCAS) Antenna
F Bottom TCAS Antenna
3. Job Set-up
Subtask 34-43-11-010-065-A ** ON A/C NOT FOR ALL
A. Get Access
   (1) Make sure that the ACCESS PLATFORM 6M (20 FT) is in position at zone 230 to get access to the TCAS top antenna 7SG1.
Subtask 34-43-11-865-108-A ** ON A/C NOT FOR ALL
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
121VUT/TISS2004SGK07
4. Procedure
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
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.
Subtask 34-43-11-914-064-A ** ON A/C NOT FOR ALL
CAUTION: AFTER THREE DAYS OF FLIGHT WITHOUT SEALANT, DO THE FULL INSTALLATION OF THE ANTENNA:
  • REMOVE THE ANTENNA
  • CLEAN THE FUSELAGE AND ANTENNA SURFACES AND REMOVE ALL SIGNS OF HUMIDITY.
IF YOU DO NOT DO THIS, WATER CAN GO INTO THE STRUCTURE AND CORROSION CAN OCCUR.
CAUTION: AFTER TEN DAYS OF FLIGHT WITH INTERPOSITION SEALANT OR A GEL/ SILICON GASKET, DO THESE STEPS:
  • CLEAN THE AREA AROUND THE ANTENNA, AND
  • APPLY A SEALANT BEAD AROUND THE ANTENNA AND/OR SEALANT ON THE HEADS OF THE SCREWS.
IF YOU DO NOT DO THIS, WATER CAN GO INTO THE STRUCTURE AND CORROSION CAN OCCUR.
A. Aircraft Antenna Sealant-Exemption
Obey the indications given in the table that follows if it is not possible to:
  • Apply the sealant.
  • Let the sealant cure during the applicable curing time.

    This table gives the time limits that are applicable for the sealant installation on the Traffic Alert and Collision Avoidance System (TCAS) Active antenna.
    These limits are adapted to:
  • The antenna installation configuration
  • The antenna location
  • The sensitive condition of the antenna to water infiltration
  • The available condition of the sealant.
Configuration of antenna installation
If the Airline has sealant but cannot wait until the sealant is cured
If the Airline has no sealant available
No sealant (Teflon gasket) between the antenna and the fuselage:
  • Sealing bead around the antenna
  • Synthetic fibre cord (Nylon) on the heads of the screws
  • Sealant on the heads of the screws
  • O-ring at the antenna connector level.

  • The installation of a sealing bead around the antenna is mandatory (no exemption possible because of the risk of water infiltration between the aircraft and the antenna).
  • It is permitted to fly for a maximum of ten days without the sealant on the head of the screws.
  • No exemption possible with the Teflon gasket because of the risk of water infiltration between the aircraft and the antenna.
  • It is permitted to fly for a maximum of three days without the sealant (sealing bead and sealant on the heads of the screws) if the O-ring is installed.
NOTE: When there is no sealing bead, there is a risk of aerodynamic noise.
Subtask 34-43-11-420-067-A ** ON A/C NOT FOR ALL
B. Installation of the Top Traffic Alert and Collision Avoidance System (TCAS) Antenna
F Top Traffic Alert and Collision Avoidance System (TCAS) Antenna ** ON A/C NOT FOR ALL
WARNING: OBEY THE COLOR CODES WHEN YOU CONNECT THE ELECTRICAL CONNECTORS (THIS WILL PREVENT CROSS-CONNECTIONS). MAKE SURE THAT YOU INSTALL THE ANTENNA IN THE CORRECT DIRECTION. IF THE ANTENNA DOES NOT POINT IN THE CORRECT DIRECTION, THE TCAS WILL ONLY SENSE TRAFFIC BEHIND THE AIRCRAFT.
   (1) Remove the COVER - PROTECTION from the opening on the fuselage structure (1).
   (2) Clean the component interface and/or the adjacent area with the Non Aqueous Cleaner-General - - (Material No.08BAA9) and a Textile-Lint free Cotton - (Material No.14SBA1) .
   (3) Do an inspection of the component interfaces and the adjacent area.
   (4) If you install the same antenna (6), clean it with the Non Aqueous Cleaner-General - - (Material No.08BAA9) .
     (a) Do a check of the groove below the preformed packing to make sure that there are no debris or unwanted materials.
     (b) Put the new AIPC 34-43-11-01-020 PREFORMED PACKING (4) in the correct position on the antenna (6).
   (5) If you install a new antenna (6), make sure that there is no adhesive label on the preformed packing.
     (a) If you remove an adhesive label, clean the area to remove the remaining adhesive as follows:
     (b) Do a check of the groove below the preformed packing to make sure that there are no debris or unwanted materials.
     (c) Align the new preformed packing with the groove at the bottom of the antenna. This is to make sure that it is in the correct position.
     (d) If the preformed packing has deformation, discard and replace it with a new AIPC 34-43-11-01-020 PREFORMED PACKING (4).
   (6) Install the foam washer (5).
   (7) Align the new AIPC 34-43-11-01-010 TEFLON GASKET (3) with the screw holes.
   (8) Remove the TAPE - MASKING that attaches the coaxial cables to the aircraft structure.
   (9) Remove the CAP - BLANKING from the connectors of the coaxial cables (2) and from the connectors (9).
   (10) Make sure that all the electrical connections are clean and in the correct condition.
   (11) Connect each connector of the coaxial cables (2) to the related connectors (9) (refer to the color codes).
     (a) Connect connector J3 (BLUE) forward.
   (12) Install the lockwire:
WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.
     (a) Safety the connectors of the coaxial cables (2) and the connectors (9) with the corrosion-resistant-steel lockwire 0.4 mm (0.015 in.) dia.
   (13) Install the antenna (6) on the fuselage structure (1) with the washers (7) and the screws (8).
   (14) Install the washers (16) and the screws (17).
   (15) TORQUE the screws (8) and (17) to between 0.37 and 0.27 m.daN (32.74 and 23.89 lbf.in ) T.
   (16) Make sure that the bonding contact resistance between the antenna (6) and the fuselage structure (1) is not more than five milliohms (Ref. AMM TASK 20-28-00-912-802).
   (17) Apply the Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) on the screw heads.
   (18) Apply a bead of Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) around the antenna (6).
   (19) Let the sealant dry.
   (20) Apply the Coating_- Flexible Structure (Material No.04QAB2) or the Top Coat Polyurethane_- - External Structure (Material No.04JAA3) on the sealant around the antenna and the heads of the screws.
   (21) Apply the Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the sealant of the heads of the screws (8) and (17).
NOTE: It is not mandatory to paint the sealant around the bottom of the antenna and on the heads of the screws.
Subtask 34-43-11-420-068-A ** ON A/C NOT FOR ALL
C. Installation of the Bottom Traffic Alert and Collision Avoidance System (TCAS) Antenna
F Bottom TCAS Antenna ** ON A/C NOT FOR ALL
   (1) Remove the COVER - PROTECTION from the opening on the plate (10).
   (2) Clean the component interface and/or the adjacent area with the Non Aqueous Cleaner-General - - (Material No.08BAA9) and the Textile-Lint free Cotton - (Material No.14SBA1) .
   (3) Do an inspection of the component interfaces and the adjacent area.
   (4) If you install the same antenna (13), clean it with the Non Aqueous Cleaner-General - - (Material No.08BAA9) .
     (a) Do a check of the groove below the seal to make sure that there are no debris or unwanted materials.
     (b) Put the new AIPC 34-52-11-01-010 SEAL (12) in the correct position on the antenna (13).
   (5) If you install a new antenna (13), make sure that there is no adhesive label on the seal.
     (a) If you remove an adhesive label, clean the area to remove the remaining adhesive as follows:
     (b) Do a check of the groove below the seal to make sure that there are no debris or unwanted materials.
     (c) Align the new seal with the groove at the bottom of the antenna. This is to make sure that it is in the correct position.
     (d) If the seal has deformation, discard and replace it with a new AIPC 34-52-11-01-010 SEAL (12).
   (6) Remove the TAPE - MASKING that attaches the coaxial cable (11) to the plate (10).
   (7) Remove the CAP - BLANKING from the coaxial cable (11) and the coaxial connector (14).
   (8) Make sure that the electrical connectors are clean and in the correct condition.
   (9) Apply the Polysulfide Sealant-Low Adhesion Fillet Structure (Material No.06AEB2) on the contact surface between the plate (10) and the antenna (13).
   (10) Apply the Release Agent-- Liquid Wax - (Material No.14DBB1) on the contact surface between the plate (10) and the antenna (13).
   (11) Connect the coaxial cable (11) to the coaxial connector (14).
   (12) Install the antenna (13) on the plate (10) with the screws (15).
   (13) TORQUE the screws (15) to between 4.8 and 3.7 m.daN (35.40 and 27.29 lbf.ft ) T.
   (14) Make sure that the bonding contact resistance between the antenna (13) and the plate (10) is not more than five milliohms (Ref. AMM TASK 20-28-00-912-802).
   (15) Apply the Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) on the screw heads.
   (16) Put a bead of Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) around the antenna (13).
Subtask 34-43-11-865-109-A ** ON A/C NOT FOR ALL
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
121VUT/TISS2004SGK07
Subtask 34-43-11-740-064-A ** ON A/C NOT FOR ALL
E. Do the BITE test of the TCAS (Ref. AMM TASK 34-72-00-740-001).
5. Close-up
Subtask 34-43-11-410-062-A ** ON A/C NOT FOR ALL
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) FOR [7SG1] (ANTENNA-TCAS, TOP)
     (a) Remove the access platform(s).
[Rev.10 from 2021] 2026.04.02 06:23:27 UTC
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