Removal of the Air Traffic Service Unit (ATSU)

TASK 46-21-34-000-001-A
Removal of the Air Traffic Service Unit (ATSU)

ZONE: 127
FIN: 1TX1

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 2M (6 FT) - ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
127	REAR AVIONIC COMPARTMENT
824

C. Referenced Information

REFERENCE	DESIGNATION
TASK 31-32-00-860-013-A	Procedure to Get Access to the SYSTEM REPORT/TEST/INFO SYS Page
ATSU

3. Job Set-up
Subtask 46-21-34-810-050-A

A. Trouble Shooting Data
If available, you can print the Trouble Shooting Data (TSD) as follows:

get access to the SYSTEM/REPORT/INFO SYS page (Ref. AMM TASK 31-32-00-860-013).
on this page, push the line key adjacent to the ATIMS indication.
on the ATIMS page, push the line key adjacent to the TROUBLE SHOOTING DATA indication to get the TROUBLE SHOOTING DATA page.
print the TROUBLE SHOOTING DATA (TSD) page(s).

Subtask 46-21-34-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ATSU 1	3TX1	L16
121VU	ATSU 1/SWTG	5TX1	L15
** ON A/C NOT FOR ALL
121VU	ATSU 1	3TX1	K43
121VU	ATSU 1/SWTG	5TX1	K42

Subtask 46-21-34-010-050-A

C. Get access to the avionics compartment.
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 824 in zone 128.
(2) Open the access door 824.

4. Procedure
Subtask 46-21-34-020-050-A

A. Removal of the ATSU
(1) Loosen the nuts (4).
(2) Lower the nuts (4).
(3) Pull the ATSU (1) on its rack (3) to disconnect the electrical connectors (2).
(4) Remove the ATSU (1) from its rack (3).
(5) Put CAP - BLANKING on the disconnected electrical connectors (2).

[Rev.10 from 2021] 2026.04.02 06:26:05 UTC