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

TASK 34-43-11-000-004-E
Removal 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	AR	CAP - BLANKING
No specific	AR	COVER - PROTECTION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SCRAPER - NON METALLIC
No specific	AR	TAPE - MASKING

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BAA9)	Non Aqueous Cleaner-General - -

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. Referenced Information

REFERENCE	DESIGNATION
TASK 34-72-34-000-001-A	Removal of the T/TISS Computer
TASK 34-72-34-400-001-A	Installation of the T/TISS Computer
ESPM 203311
ESPM 205222
Top Traffic Alert and Collision Avoidance System (TCAS) Antenna
Bottom TCAS Antenna

3. Job Set-up
Subtask 34-43-11-865-107-A ** ON A/C NOT FOR ALL

A. Open, safety and tag this(these) circuit breaker(s):

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

Subtask 34-43-11-010-064-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put an ACCESS PLATFORM 6M (20 FT) in position at zone 230 to get access to top TCAS antenna 7SG1.

4. Procedure
Subtask 34-43-11-020-066-A ** ON A/C NOT FOR ALL

A. Removal of the Top Traffic Alert and Collision Avoidance System (TCAS) Antenna

Top Traffic Alert and Collision Avoidance System (TCAS) Antenna ** ON A/C NOT FOR ALL

(1) Remove the sealant and the cord from the heads of the screws (8), (17) and from around the bottom of the antenna.
(2) Remove the screws (8) and (17) and the washers (7) and (16).
(3) Pull the antenna (6) away from the fuselage structure (1).
(4) Remove 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) Remove and discard the lockwire from the connectors of the coaxial cables (2).
(5) Disconnect the connectors of the coaxial cables (2).
(a) Make sure that you do not let the connectors of the coaxial cables (2) go into the fuselage.
(6) Remove the foam washer (5).
(7) Remove and discard the preformed packing (4) and the Teflon gasket (3).
(8) Remove the antenna (6).
(a) Make sure that there is no discoloration (blue discoloration) on the coaxial cables (2).
1 If you are not sure of the correct condition of the coaxial cables (2), do the steps that follow:

Remove the Traffic and Terrain Integrated Surveillance System (T/TISS) computer from its rack (Ref. AMM TASK 34-72-34-000-001).
Do a test for a short circuit between the core and the shield of the coaxial cables (2). Refer to the test between two conductors ESPM 205222.
Measure the resistance between the core and the metal part of the connectors of the coaxial cables (2).
Make sure that the resistance is a minimum of 5 MOhms (open circuit).
If the resistance between the core and the shield of the coaxial cables (2) is less than 5 MOhms, replace the coaxial cables (2) ESPM 203311.
Install the T/TISS computer (Ref. AMM TASK 34-72-34-400-001).

(9) Put the CAP - BLANKING on the disconnected connectors of the coaxial cables (2) and on the connectors (9).
(10) Put the TAPE - MASKING around the coaxial cables (2) and attach the coaxial cables (2) to the fuselage structure (1).
(11) Remove the sealant with the SCRAPER - NON METALLIC and clean the fuselage structure (1) with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(12) Put the COVER - PROTECTION in position on the opening to prevent contamination.

Subtask 34-43-11-020-067-A ** ON A/C NOT FOR ALL

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

Bottom TCAS Antenna ** ON A/C NOT FOR ALL

(1) Remove the sealant from the screw heads and around the antenna base.
(2) Remove the screws (15).
(3) Pull the antenna (13) away from the plate (10).
(4) Disconnect the coaxial cable (11) from the coaxial connector (14).
(5) Remove and discard the seal (12).
(6) Remove the antenna (13).
(a) Make sure that there is no discoloration (blue discoloration) on the coaxial cable.
1 If you are not sure of the correct condition of the coaxial cable, do the steps that follow:

Remove the Traffic and Terrain Integrated Surveillance System (T/TISS) computer from its rack (Ref. AMM TASK 34-72-34-000-001).
Do a test for a short circuit between the core and the shield of the coaxial cable (11). Refer to the test between two conductors ESPM 205222.
Measure the resistance between the core and the metal part of the connector of the coaxial cable (11).
Make sure that the resistance is a minimum of 5 MOhms (open circuit).
If the resistance between the core and the shield of the coaxial cable (11) is less than 5 MOhms, replace the coaxial cable (11) ESPM 203311.
Install the T/TISS computer (Ref. AMM TASK 34-72-34-400-001).

(7) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(8) Apply the TAPE - MASKING around the coaxial cable (11) and attach it to the plate (10).
(9) Remove the sealant with the SCRAPER - NON METALLIC and clean the plate (10) with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(10) Put the COVER - PROTECTION in position on the opening on the plate (10) to prevent contamination.

[Rev.10 from 2021] 2026.04.01 01:02:03 UTC