Installation of the SDAC

TASK 31-55-34-400-001-A
Installation of the SDAC

ZONE: 127
ZONE: 128
FIN: 1WV1
FIN: 1WV2

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
128	REAR AVIONIC COMPARTMENT
824

C. Referenced Information

REFERENCE	DESIGNATION
TASK 31-50-00-710-001-A	Ground Scanning of the Central Warning System
TASK 31-50-00-710-003-A	Operational Test of the System Data Acquisition Concentrator (SDAC)
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
System Data Acquisition Concentrator (SDAC)

3. Job Set-up
Subtask 31-55-34-860-050-A

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the access door 824 in zone 128.
(2) Make sure that the access door 824 is open (Ref. AMM TASK 52-41-00-010-002).

Subtask 31-55-34-865-054-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 1WV1 (SDAC1)
49VU	SDAC/1 AND 2/28VDC/ESS BUS	12WV	F05
49VU	SDAC/1/SPLY	3WV	F04
49VU	SDAC/1/26VAC SYNC/AC ESS BUS	5WV	F02
** ON A/C NOT FOR ALL
121VU	EIS/SDAC/1/BUS1/26VAC SYNC AC	9WV	Q04
** ON A/C ALL
121VU	HYDRAULIC/HYD/QTY/IND	1831GQ	P35
121VU	EIS/SDAC/1/BUS2/26VAC SYNC AC	7WV	Q03
FOR FIN: 1WV2 (SDAC2)
49VU	SDAC/1 AND 2/28VDC/ESS BUS	12WV	F05
49VU	SDAC/2/26VAC SYNC/AC ESS BUS	6WV	F03
121VU	EIS/SDAC/2/SPLY	2WV	Q06
121VU	EIS/SDAC/2/BUS1/26VAC SYNC AC	10WV	Q05
121VU	EIS/SDAC/2/BUS2/26VAC SYNC AC	8WV	Q02

4. Procedure
Subtask 31-55-34-420-050-A

A. Installation of the SDAC
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove blanking caps from the electrical connectors (1).
(4) Make sure that the electrical connectors (1) are in the correct condition.
(5) Install the SDAC (5) on its rack (2).
(6) Push the SDAC (5) on its rack (2) to connect the electrical connectors (1).

CAUTION: MAKE SURE THAT THE OBRM(S) IS (ARE) CORRECTLY INSTALLED. IF IT (THEY) IS(ARE) NOT INSTALLED CORRECTLY, PUSH THE OBRM(S) UNTIL THE LOCKING DEVICES ARE LOCKED.

(7) Engage the nuts (3) on the lugs (4) and tighten.

Subtask 31-55-34-865-052-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 ALL
FOR FIN: 1WV1 (SDAC1)
49VU	SDAC/1 AND 2/28VDC/ESS BUS	12WV	F05
49VU	SDAC/1/SPLY	3WV	F04
49VU	SDAC/1/26VAC SYNC/AC ESS BUS	5WV	F02
** ON A/C NOT FOR ALL
121VU	EIS/SDAC/1/BUS1/26VAC SYNC AC	9WV	Q04
** ON A/C ALL
121VU	HYDRAULIC/HYD/QTY/IND	1831GQ	P35
121VU	EIS/SDAC/1/BUS2/26VAC SYNC AC	7WV	Q03
FOR FIN: 1WV2 (SDAC2)
49VU	SDAC/1 AND 2/28VDC/ESS BUS	12WV	F05
49VU	SDAC/2/26VAC SYNC/AC ESS BUS	6WV	F03
121VU	EIS/SDAC/2/SPLY	2WV	Q06
121VU	EIS/SDAC/2/BUS1/26VAC SYNC AC	10WV	Q05
121VU	EIS/SDAC/2/BUS2/26VAC SYNC AC	8WV	Q02

Subtask 31-55-34-710-051-A

C. Do the ground scanning of the Central Warning System (Ref. AMM TASK 31-50-00-710-001)

NOTE: As an alternative procedure, you can do this operational test without the CFDS (Ref. AMM TASK 31-50-00-710-003).

5. Close-up
Subtask 31-55-34-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 824 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 00:37:33 UTC