Removal of the ATC/TCAS Control Unit

TASK 34-52-12-000-001-A
Removal of the ATC/TCAS Control Unit

ZONE: 211
FIN: 3SH

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	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
211	COCKPIT

C. Referenced Information

REFERENCE	DESIGNATION
ATC/TCAS Control Unit

3. Job Set-up
Subtask 34-52-12-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	COM NAV/ATC/1	5SH1	G11
** ON A/C NOT FOR ALL
121VU	COM NAV/ATC/2	5SH2	K07
** ON A/C NOT FOR ALL
121VU	T/TISS	2004SG	K07

4. Procedure
Subtask 34-52-12-020-050-A

A. Removal of the ATC/TCAS Control Unit (3SH)

NOTE: If your ATC/TCAS control unit has an INOP label(s) on its face and if you must use this (these) label(s) for the new ATC/TCAS control unit:

remove this (these) label(s) carefully
keep them for installation on the new ATC/TCAS control unit.

(1) Loosen the four quarter-turn fasteners (1).
(2) Disengage the ATC/TCAS control unit (2) from its housing (5).
(3) Disconnect the electrical connectors (4) and hold them away from the panel.
(4) Remove the ATC/TCAS control unit (2).
(5) Put CAP - BLANKING on the disconnected electrical connectors (3) and (4).

[Rev.10 from 2021] 2026.04.01 06:03:12 UTC