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

TASK 34-43-11-400-004-C
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

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	1	SCRAPER - NON METALLIC
FOR [7SG1] (ANTENNA-TCAS, TOP)
No specific	Torque wrench: range to between 0.37 and 0.27 m.daN (32.74 and 23.89 lbf.in )
FOR [7SG2] (ANTENNA-TCAS, BOTTOM)
No specific	Torque wrench: range to between 0.37 and 0.27 m.daN (32.74 and 23.89 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -
FOR [7SG1] (ANTENNA-TCAS, TOP)
(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.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -
No specific	corrosion-resistant-steel lockwire 0.4 mm (0.015 in.) dia
FOR [7SG2] (ANTENNA-TCAS, BOTTOM)
(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.08BAA9)	Non Aqueous Cleaner-General - -
(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
FOR [7SG1] (ANTENNA-TCAS, TOP)
3	TEFLON GASKET	AIPC 34-43-11-01-010
4	PREFORMED PACKING	AIPC 34-43-11-01-020
FOR [7SG2] (ANTENNA-TCAS, BOTTOM)
14	TEFLON GASKET	AIPC 34-43-11-01-010
15	PREFORMED PACKING	AIPC 34-43-11-01-020

E. Referenced Information

REFERENCE	DESIGNATION
TASK 34-72-00-740-001-A	BITE Test of the T/TISS
Traffic Alert and Collision Avoidance System (TCAS) Antenna
FOR [7SG1] (ANTENNA-TCAS, TOP)
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
FOR [7SG2] (ANTENNA-TCAS, BOTTOM)
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure

3. Job Set-up
Subtask 34-43-11-860-055-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 ATC2/TCAS top antenna 7SG1.

Subtask 34-43-11-875-051-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	T/TISS	2004SG	K07

4. Procedure
Subtask 34-43-11-914-056-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 34-43-11-420-057-A ** ON A/C NOT FOR ALL

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

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 used sealant from the fuselage structure (1) and/or (12) with the SCRAPER - NON METALLIC.
(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) FOR [7SG1] (ANTENNA-TCAS, TOP)
(a) If you install the same antenna (6), clean it with the Non Aqueous Cleaner-General - - (Material No.08BAA9) .
1 Do a check of the groove below the preformed packing to make sure that there are no debris or unwanted materials.
2 Put the new AIPC 34-43-11-01-020 PREFORMED PACKING (4) in the correct position on the antenna (6).
(b) If you install a new antenna (6), make sure that there is no adhesive label on the preformed packing.
1 If you remove an adhesive label, clean the area to remove the remaining adhesive as follows:

Use a moist Textile-Lint free Cotton - (Material No.14SBA1) .
Do not use a chemical solvent.

2 Do a check of the groove below the preformed packing to make sure that there are no debris or unwanted materials.
3 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.
4 If the preformed packing has deformation, discard and replace it with a new AIPC 34-43-11-01-020 PREFORMED PACKING (4).
(c) Install the foam washer (5).
(d) Align the new AIPC 34-43-11-01-010 TEFLON GASKET (3) with the screw holes.
(e) Remove the CAP - BLANKING from the connectors of the coaxial cable (2) and from the connectors (9).
(f) Make sure that all the electrical connections are clean and in the correct condition.
(g) Remove the TAPE - MASKING from the coaxial cables (2) and connect each connector to the related connector (9) (refer to the color codes).
1 Connect connector J3 (BLUE) forward.
(h) 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.

1 Safety the connectors of the coaxial cable (2) and the connectors (9) with the corrosion-resistant-steel lockwire 0.4 mm (0.015 in.) dia.
(i) Install the antenna (6) on the fuselage structure (1) with the washers (7) and the screws (8).
(j) Install the washers (11) and the screws (10).
(k) TORQUE the screws (8) and (10) to between 0.37 and 0.27 m.daN (32.74 and 23.89 lbf.in )

.
(l) Make sure that the bonding contact resistance between the antenna (6) and the fuselage structure (1) is not more than 5 milliohms (Ref. AMM TASK 20-28-00-912-802).
(m) Apply the Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) on the screw heads.
(n) Apply a bead of Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) around the antenna (6).
(o) Let the sealant become dry.
(p) 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 screw heads.
(q) Apply the Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the sealant of the heads of the screws (8) and (10).

NOTE: It is not mandatory to paint the sealant around the bottom of the antenna and on the heads of the screws.

(5) FOR [7SG2] (ANTENNA-TCAS, BOTTOM)
(a) If you install the same antenna (16), clean it with the Non Aqueous Cleaner-General - - (Material No.08BAA9) .
1 Do a check of the groove below the preformed packing to make sure that there are no debris or unwanted materials.
2 Put the new AIPC 34-43-11-01-020 PREFORMED PACKING (15) in the correct position on the antenna (16).
(b) If you install a new antenna (16), make sure that there is no adhesive label on the preformed packing.
1 If you remove an adhesive label, clean the area to remove the remaining adhesive as follows:

Use a moist Textile-Lint free Cotton - (Material No.14SBA1) .
Do not use a chemical solvent.

2 Do a check of the groove below the preformed packing to make sure that there are no debris or unwanted materials.
3 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.
4 If the preformed packing has deformation, discard and replace it with a new AIPC 34-43-11-01-020 PREFORMED PACKING (15).
(c) Align the new AIPC 34-43-11-01-010 TEFLON GASKET (14) with the screw holes.
(d) Remove the CAP - BLANKING from the connectors of the coaxial cable (13) and from the connectors (19).
(e) Make sure that all the electrical connections are clean and in the correct condition.
(f) Remove the TAPE - MASKING from the coaxial cables (13) and connect each connector to the related connector (19) (refer to the color codes).
1 Connect connector J3 (BLUE) forward.
(g) Install the lockwire:

1 Safety the connectors of the coaxial cable (13) and the connectors (19) with the corrosion-resistant-steel lockwire 0.4 mm (0.015 in.) dia.
(h) Install the antenna (16) on the fuselage structure (12) with the washers (17) and the screws (18).
(i) TORQUE the screws (18) to between 0.37 and 0.27 m.daN (32.74 and 23.89 lbf.in )

.
(j) Make sure that the bonding contact resistance between the antenna (16) and the fuselage structure (12) is not more than 5 milliohms (Ref. AMM TASK 20-28-00-912-802).
(k) Apply the Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) on the screw heads.
(l) Apply a bead of Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) around the antenna (16).
(m) Let the sealant become dry.
(n) 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 screw heads.
(o) Apply the Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the sealant of the heads of the screws (18).

NOTE: It is not mandatory to paint the sealant around the bottom of the antenna and on the heads of the screws.

Subtask 34-43-11-875-052-A ** ON A/C NOT FOR ALL

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	T/TISS	2004SG	K07

Subtask 34-43-11-740-057-A ** ON A/C NOT FOR ALL

D. Do the BITE test of the T/TISS (TCAS part and ATC2 part) (Ref. AMM TASK 34-72-00-740-001).

5. Close-up
Subtask 34-43-11-410-055-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 only.
Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 01:02:00 UTC