Installation of the Air Traffic Service Unit (ATSU)

TASK 46-21-34-400-001-A
Installation 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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
127	REAR AVIONIC COMPARTMENT
824

C. Referenced Information

REFERENCE	DESIGNATION
TASK 46-21-00-610-001-A	Uploading of the ATSU Software with the PDL (SFIM or equivalent)
TASK 46-21-00-610-803-A	Uploading of the ATSU Software Component
TASK 46-21-00-610-804-A	Uploading of the Air Traffic Service Unit Software with the High Speed PDL
TASK 46-21-00-710-002-A	VHF 3 Link Test of the ATSU
TASK 46-21-00-740-001-A	BITE Test of the ATIMS
ATSU

3. Job Set-up
Subtask 46-21-34-860-050-A

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position below access door 824 in zone 128.
(2) Make sure that access door 824 is open.

Subtask 46-21-34-865-051-A

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	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

4. Procedure
Subtask 46-21-34-420-050-A

A. Installation of the ATSU
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking caps from the electrical connectors (2).
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Install the ATSU (1) on its rack (3).
(6) Push the ATSU (1) on its rack (3) to connect the electrical connectors (2).
(7) Engage the nuts (4) on the lugs (5) and tighten them.

Subtask 46-21-34-865-052-A

B. 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	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 46-21-34-610-054-A

C. Entry of the Flight Number

ACTION	RESULT
1.Adjust the brightness of the MCDU screen.	The MCDU is on.
2.Push the INIT mode key.	The INIT page comes into view.
3.On the MCDU scratchpad: Enter the flight number. Push the line key adjacent to the FLT NBR indication. NOTE: The flight number is the ICAO airline code followed by 0000.	On the INIT page, the flight number is shown.

Subtask 46-21-34-610-050-A ** ON A/C NOT FOR ALL

D. Uploading of the ATSU Software Component and Applications
(1) Upload the ATSU software with the Portable Data Loader (PDL) (SFIM or equivalent) (Ref. AMM TASK 46-21-00-610-001).

Subtask 46-21-34-610-050-G ** ON A/C NOT FOR ALL

D. Uploading of the ATSU Software Component and Applications
(1) Upload the ATSU software component (Ref. AMM TASK 46-21-00-610-803) or (Ref. AMM TASK 46-21-00-610-804) (as applicable).

Subtask 46-21-34-740-050-A

E. Do the BITE test of the ATIMS (Ref. AMM TASK 46-21-00-740-001).

Subtask 46-21-34-740-051-A

F. Do the VHF3 link test of the ATSU (Ref. AMM TASK 46-21-00-710-002) to do a check of the correct operation of the datalink communication.

5. Close-up
Subtask 46-21-34-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access door 824.
(3) Remove the access platform(s).

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