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

TASK 34-43-11-000-001-C
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	AR	ACCESS PLATFORM 6M (20 FT)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SCRAPER - NON METALLIC
FOR [7SG1] (ANTENNA-TCAS, TOP)
No specific	AR	CAP - BLANKING
No specific	1	TAPE - MASKING
FOR [7SG2] (ANTENNA-TCAS, BOTTOM)
No specific	AR	CAP - BLANKING
No specific	1	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
Traffic Alert and Collision Avoidance System (TCAS) Antenna
FOR [7SG1] (ANTENNA-TCAS, TOP)
TASK 34-43-34-000-001-A	Removal of the TCAS Computer
TASK 34-43-34-400-001-A	Installation of the TCAS Computer
ESPM 203311
ESPM 205222
FOR [7SG2] (ANTENNA-TCAS, BOTTOM)
TASK 34-43-34-000-001-A	Removal of the TCAS Computer
TASK 34-43-34-400-001-A	Installation of the TCAS Computer
ESPM 203311
ESPM 205222

3. Job Set-up
Subtask 34-43-11-865-092-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	COM NAV/TCAS	4SG	K10

Subtask 34-43-11-010-058-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 34-43-11-020-060-C ** ON A/C NOT FOR ALL

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

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

(1) FOR [7SG1] (ANTENNA-TCAS, TOP)
(a) Remove the sealant and the cord from the heads of the screws (9) and from around the bottom of the antenna.
(b) Remove the screws (9) and the washers (8).
(c) Do not use a metal tool as a lever to remove the antenna from the fuselage.
(d) Pull the antenna (6) away from the fuselage structure (1).
(e) 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.

1 Remove and discard the lockwire from the connectors of the coaxial cables (2).
(f) Disconnect the connectors of the coaxial cables (2).
(g) Make sure that you do not let the connectors of the coaxial cables (2) go into the fuselage.
(h) Remove the foam washer (5).
(i) Remove and discard the O-ring (4) and the gasket (3).
(j) Remove the antenna (6).
(k) 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 TCAS computer from its rack (Ref. AMM TASK 34-43-34-000-001).
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 TCAS computer (Ref. AMM TASK 34-43-34-400-001).

(l) Put the CAP - BLANKING on the disconnected connectors of the coaxial cables (2) and on the connectors (7).
(m) Put the TAPE - MASKING around the coaxial cables (2) and attach the coaxial cables (2) to the fuselage.
(2) FOR [7SG2] (ANTENNA-TCAS, BOTTOM)
(a) Remove the sealant and the cord from the heads of the screws (17), (19) and from around the bottom of the antenna.
(b) Remove the screws (17) and (19) and the washers (16) and (18).
(c) Do not use a metal tool as a lever to remove the antenna from the fuselage.
(d) Pull the antenna (14) away from the fuselage structure (10).
(e) Remove the lockwire:

1 Remove and discard the lockwire from the connectors of the coaxial cables (11).
(f) Disconnect the connectors of the coaxial cables (11).
(g) Remove and discard the O-ring (13) and the gasket (12).
(h) Remove the antenna (14).
(i) Make sure that there is no discoloration (blue discoloration) on the coaxial cables (11).
1 If you are not sure of the correct condition of the coaxial cables (11), do the steps that follow:

Remove the TCAS computer from its rack (Ref. AMM TASK 34-43-34-000-001).
Do a test for a short circuit between the core and the shield of the coaxial cables (11). 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 (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 cables (11) is less than 5 MOhms, replace the coaxial cables (11) ESPM 203311.
Install the TCAS computer (Ref. AMM TASK 34-43-34-400-001).

(j) Put the CAP - BLANKING on the disconnected connectors of the coaxial cables (11) and on the connectors (15).
(k) Put the TAPE - MASKING around the coaxial cables (11) and attach the coaxial cables (11) to the fuselage.
(3) Remove the sealant with the SCRAPER - NON METALLIC and clean the fuselage structure with Non Aqueous Cleaner-General - - (Material No.08BAA9) .

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