Installation of the Decoder/Encoder Unit B

TASK 23-73-47-400-001-A
Installation of the Decoder/Encoder Unit B

ZONE: 200
FIN: 300RH1
FIN: 300RH3 ** ON A/C NOT FOR ALL
FIN: 300RH4 ** ON A/C NOT FOR ALL
FIN: 300RH5 ** ON A/C NOT FOR ALL
FIN: 300RH6
FIN: 300RH7 ** ON A/C NOT FOR ALL
FIN: 300RH8 ** 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	STEPLADDER 0.5 M (1.6 FT)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
200	UPPER HALF FUSELAGE
FOR [300RH1] (DEU-B)
221BC
FOR [300RH4] (DEU-B)
251KC
242QW
231JC
FOR [300RH5] (DEU-B)
FOR [300RH6] (DEU-B)
251KC
261CC
FOR [300RH6] (DEU-B)
251KC
242WW
FOR [300RH7] (DECODER/ENCODER UNIT B)
231JC
FOR [300RH7] (DECODER/ENCODER UNIT B)
FOR [300RH8] (DEU-B)
261DF
261CC

C. Referenced Information

REFERENCE	DESIGNATION
TASK 23-73-00-740-005-A	BITE-Test of the Cabin Intercommunication Data System (CIDS) through the CFDS
TASK 23-73-00-740-005-B	Interface and Power-Up Test of the Cabin Intercommunication Data System (CIDS) through the CFDS
TASK 23-73-00-861-001-A	Energize the Cabin Intercommunication Data System (CIDS)
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 26-10-00-740-801-A	BITE Test of the Smoke Detection Function - System Test
Decoder/Encoder Unit B ** ON A/C NOT FOR ALL
Decoder/Encoder Unit B ** ON A/C NOT FOR ALL
Decoder/Encoder Unit B ** ON A/C NOT FOR ALL
Decoder/Encoder Unit B ** ON A/C NOT FOR ALL
Decoder/Encoder Unit B ** ON A/C NOT FOR ALL
Decoder/Encoder Unit B ** ON A/C NOT FOR ALL
FOR [300RH1] (DEU-B)
TASK 25-23-42-000-001-A	Removal of the Ceiling Panels - Forward Utility Area
TASK 25-23-42-400-001-A	Installation of the Ceiling Panels - Forward Utility Area
FOR [300RH4] (DEU-B)
TASK 25-23-41-000-001-A	Removal of the Ceiling Panels
TASK 25-23-41-400-001-A	Installation of the Ceiling Panels
TASK 25-23-43-000-001-A	Removal of the Upper Sidewall Panel
TASK 25-23-43-400-001-A	Installation of the Upper Sidewall Panel
FOR [300RH5] (DEU-B)
FOR [300RH6] (DEU-B)
TASK 25-23-41-000-001-A	Removal of the Ceiling Panels
TASK 25-23-41-400-001-A	Installation of the Ceiling Panels
TASK 25-23-42-000-002-A	Removal of the Ceiling Panels - Aft Utility Area
TASK 25-23-42-400-002-A	Installation of the Ceiling Panels - Aft Utility Area
FOR [300RH6] (DEU-B)
TASK 25-23-41-000-001-A	Removal of the Ceiling Panels
TASK 25-23-41-400-001-A	Installation of the Ceiling Panels
TASK 25-23-48-000-001-A	Removal of the Cove Light Panel
TASK 25-23-48-400-001-A	Installation of the Cove Light Panel
FOR [300RH7] (DECODER/ENCODER UNIT B)
TASK 25-23-42-000-001-A	Removal of the Ceiling Panels - Forward Utility Area
TASK 25-23-42-400-001-A	Installation of the Ceiling Panels - Forward Utility Area
FOR [300RH7] (DECODER/ENCODER UNIT B)
FOR [300RH8] (DEU-B)
TASK 25-23-42-000-002-A	Removal of the Ceiling Panels - Aft Utility Area
TASK 25-23-42-400-002-A	Installation of the Ceiling Panels - Aft Utility Area

3. Job Set-up
Subtask 23-73-47-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized
(Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the STEPLADDER 0.5 M (1.6 FT) is below the related access panel.
(3) Make sure that the forward utility-area ceiling panel is removed.
(a) FOR [300RH1] (DEU-B)
221BC (Ref. AMM TASK 25-23-42-000-001)

(4) Make sure that the upper sidewall panel is removed.

(a) FOR [300RH4] (DEU-B)
242QW (Ref. AMM TASK 25-23-43-000-001)

(5) Make sure that the aft utility-area ceiling panel is removed.

(a) FOR [300RH5] (DEU-B), [300RH6] (DEU-B)
261CC (Ref. AMM TASK 25-23-42-000-002)

Subtask 23-73-47-860-050-B ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized
(Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the STEPLADDER 0.5 M (1.6 FT) is below the related access panel.
(3) Make sure that the forward utility-area ceiling panel is removed.

(a) FOR [300RH1] (DEU-B)
221BC

(b) FOR [300RH7] (DECODER/ENCODER UNIT B)
231JC (Ref. AMM TASK 25-23-42-000-001)

(4) Make sure that the aft utility-area ceiling panel is removed.

(a) FOR [300RH4] (DEU-B)
251KC

(b) FOR [300RH5] (DEU-B), [300RH6] (DEU-B)
261CC (Ref. AMM TASK 25-23-42-000-002)

Subtask 23-73-47-860-050-J ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized
(Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the STEPLADDER 0.5 M (1.6 FT) is below the related access panel.
(3) Make sure that the forward utility area - ceiling panel is removed:
(a) FOR [300RH1] (DEU-B)
221BC (Ref. AMM TASK 25-23-42-000-001).
(4) Make sure that the ceiling panel is removed:
(a) FOR [300RH4] (DEU-B)
231JC (Ref. AMM TASK 25-23-41-000-001).
(b) FOR [300RH5] (DEU-B), [300RH6] (DEU-B)
251KC (Ref. AMM TASK 25-23-41-000-001).
(5) Make sure that the aft utility area - ceiling panel is removed.
(a) FOR [300RH7] (DECODER/ENCODER UNIT B), [300RH8] (DEU-B)
261DF (Ref. AMM TASK 25-23-42-000-002).

Subtask 23-73-47-860-050-M ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized
(Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the STEPLADDER 0.5 M (1.6 FT) is below the related access panel.
(3) Make sure that the forward utility area - ceiling panel is removed:
(a) FOR [300RH1] (DEU-B)
221BC (Ref. AMM TASK 25-23-42-000-001).
(4) Make sure that the ceiling panel is removed:
(a) FOR [300RH4] (DEU-B)
231JC (Ref. AMM TASK 25-23-41-000-001).
(b) FOR [300RH6] (DEU-B)
251KC (Ref. AMM TASK 25-23-41-000-001).
(5) Make sure that the aft utility area - ceiling panel is removed.
(a) FOR [300RH7] (DECODER/ENCODER UNIT B), [300RH8] (DEU-B)
261CC (Ref. AMM TASK 25-23-42-000-002).

Subtask 23-73-47-860-050-N ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized
(Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the STEPLADDER 0.5 M (1.6 FT) is below the related access panel.
(3) Make sure that the forward utility area - ceiling panel is removed:
(a) FOR [300RH1] (DEU-B)
221BC (Ref. AMM TASK 25-23-42-000-001).
(4) Make sure that the cove light panel is removed:
(a) FOR [300RH6] (DEU-B)
242WW (Ref. AMM TASK 25-23-48-000-001).
(5) Make sure that the aft utility area - ceiling panel is removed.
(a) FOR [300RH7] (DECODER/ENCODER UNIT B), [300RH8] (DEU-B)
261CC (Ref. AMM TASK 25-23-42-000-002).

Subtask 23-73-47-860-050-Q ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized
(Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the STEPLADDER 0.5 M (1.6 FT) is below the related access panel.
(3) Make sure that the forward utility area - ceiling panel is removed:
(a) FOR [300RH1] (DEU-B)
221BC (Ref. AMM TASK 25-23-42-000-001).
(4) Make sure that the ceiling panel is removed:
(a) FOR [300RH4] (DEU-B)
231JC (Ref. AMM TASK 25-23-41-000-001).
(b) FOR [300RH5] (DEU-B), [300RH6] (DEU-B)
251KC (Ref. AMM TASK 25-23-41-000-001).
(5) Make sure that the aft utility area - ceiling panel is removed:
(a) FOR [300RH7] (DECODER/ENCODER UNIT B), [300RH8] (DEU-B)
261CC (Ref. AMM TASK 25-23-42-000-002).

Subtask 23-73-47-865-051-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
49VU	COM/CIDS/DEU B/ESS	153RH	G03
** ON A/C NOT FOR ALL
49VU	COM/CIDS/DEU B ESS/R	420RH	G05
49VU	COM/CIDS/DEU B ESS/L	419RH	G04
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU B/NORM	162RH	M08
** ON A/C NOT FOR ALL
121VU	COM / CIDS / DEU B / NORM FWD	193RH	M09
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU B NORM/R	620RH	M08
121VU	COM NAV/CIDS/DEU B NORM/L	619RH	M07
121VU	COM/CIDS/DEU B BAT/R	720RH	Q11
121VU	COM/CIDS/DEU B BAT/L	719RH	Q10
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU B/NORM	162RH	M09
** ON A/C NOT FOR ALL
121VU	COM/CIDS/DEU B/BAT	143RH	N12
** ON A/C NOT FOR ALL
2000VU	WATER SYSTEM-QANT-IND	1MA	B01
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACUUM-SYS	35MG	A06
** ON A/C NOT FOR ALL
2001VU	WATER SYS-QUANT-IND	1MA	B06
** ON A/C NOT FOR ALL
2001VU	WATER SYS-DRAIN	1MP	B05
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACUUM-GEN	33MG	A08
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-E	34MG	A04
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-D	39MG	A03
** ON A/C ALL
2001VU	VACU TOIL SYS-LAV PWR-A	32MG	A01
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACU-SYS	35MG	A06
** ON A/C NOT FOR ALL
2001VU	WATER-SYS-DRAIN	1MP	B05
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACU-GEN	33MG	A08
** ON A/C NOT FOR ALL
2001VU	CIDS-DEU B-NORM-AFT	194RH	C08
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-G	34MG	A04
2001VU	VACU TOIL SYS-LAV PWR-F	39MG	A03
2001VU	VACU TOIL SYS-LAV PWR-D	45MG	A02
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-L	45MG	A02
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-L	23MG	A05
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-M	34MG	A04

4. Procedure

CAUTION: REFER TO THE MATCH MARKS MADE DURING THE REMOVAL WHEN YOU CONNECT THE ELECTRICAL WIRES. IF YOU MAKE AN ERROR WHEN YOU CONNECT THE WIRES YOU WILL CAUSE DAMAGE TO EQUIPMENT.

Subtask 23-73-47-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Decoder/Encoder Unit (DEU) B

Decoder/Encoder Unit B ** ON A/C NOT FOR ALL

(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), (3) and (4).
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Carefully install the DEU B (1) into the mounting tray (6). Make sure that the DEU B (1) is correctly aligned to prevent damage to the electrical connector (4).
(6) Connect the electrical connectors (2) and (3) to the DEU B (1) and safety with the locking springs (7).

Subtask 23-73-47-420-050-B ** ON A/C NOT FOR ALL

A. Installation of the Decoder/Encoder Unit (DEU) B

Decoder/Encoder Unit B ** ON A/C NOT FOR ALL

(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Put the DEU B (6) in the correct position.
(4) Tighten the nylatches (5).
(5) Remove the CAP-BLANKING from each electrical connector and receptacle.
(6) Make sure that all the electrical connections are clean and in the correct condition.
(7) Connect the electrical connectors (2) to the DEU B (6).
(8) Safety the electrical connectors (2).

CAUTION: MAKE SURE THAT THE SPRING LATCHES CORRECTLY HOLD THE CONNECTOR IN THE FULLY ENGAGED POSITION. THE SPRING LATCHES PREVENT UNWANTED MOVEMENT OF THE CONNECTOR, AND THUS THE RISK OF ARCING, WHICH CAN CAUSE DAMAGE TO THE UNIT.

(a) Safety the electrical connectors (2) with the spring latches (1).
(9) Make sure that the coding switches are in the positions recorded during the removal procedure.
(10) Install the connection/termination box (4) and tighten the nylatches (3).

Subtask 23-73-47-865-052-A

B. Remove the safety clips and tags and close these circuit breakers in this sequence:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2001VU	WATER SYS-DRAIN	1MP	B05
** ON A/C NOT FOR ALL
2001VU	WATER-SYS-DRAIN	1MP	B05
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-L	45MG	A02
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-D	45MG	A02
2001VU	VACU TOIL SYS-LAV PWR-F	39MG	A03
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-D	39MG	A03
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACU-SYS	35MG	A06
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACUUM-SYS	35MG	A06
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-M	34MG	A04
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-G	34MG	A04
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-E	34MG	A04
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACU-GEN	33MG	A08
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACUUM-GEN	33MG	A08
** ON A/C ALL
2001VU	VACU TOIL SYS-LAV PWR-A	32MG	A01
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-L	23MG	A05
** ON A/C NOT FOR ALL
2000VU	WATER SYSTEM-QANT-IND	1MA	B01
** ON A/C NOT FOR ALL
2001VU	WATER SYS-QUANT-IND	1MA	B06
** ON A/C NOT FOR ALL
2001VU	CIDS-DEU B-NORM-AFT	194RH	C08
121VU	COM / CIDS / DEU B / NORM FWD	193RH	M09
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU B/NORM	162RH	M09
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU B/NORM	162RH	M08
** ON A/C NOT FOR ALL
49VU	COM/CIDS/DEU B/ESS	153RH	G03
** ON A/C NOT FOR ALL
121VU	COM/CIDS/DEU B/BAT	143RH	N12
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU B NORM/L	619RH	M07
121VU	COM NAV/CIDS/DEU B NORM/R	620RH	M08
49VU	COM/CIDS/DEU B ESS/L	419RH	G04
49VU	COM/CIDS/DEU B ESS/R	420RH	G05
121VU	COM/CIDS/DEU B BAT/L	719RH	Q10
121VU	COM/CIDS/DEU B BAT/R	720RH	Q11

Subtask 23-73-47-869-050-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Make sure that the Cabin Intercommunication Data System (CIDS) is energized
(Ref. AMM TASK 23-73-00-861-001).
(2) Do the BITE test of the CIDS through the CFDS (Ref. AMM TASK 23-73-00-740-005).

Subtask 23-73-47-869-050-B ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Make sure that the Cabin Intercommunication Data System (CIDS) is energized
(Ref. AMM TASK 23-73-00-861-001).
(2) Do the Interface and Power-up test of the CIDS (Ref. AMM TASK 23-73-00-740-005).

Subtask 23-73-47-740-050-A ** ON A/C NOT FOR ALL

D. Do the BITE test of the smoke detection function - system test
(Ref. AMM TASK 26-10-00-740-801).

Subtask 23-73-47-869-051-A ** ON A/C NOT FOR ALL

E. Make sure that the EMER EXIT LT switch 4WL on the overhead panel 25VU is in the OFF position.

Subtask 23-73-47-710-050-B ** ON A/C NOT FOR ALL

F. Do this test

ACTION	RESULT
1.In the cockpit, on the circuit breaker panel 121VU:
Open the circuit breakers DIR 1/2 NORM 151RH and 156RH.
2.In the cockpit, on the circuit breaker panel 49VU:	In the cockpit, on the ECAM upper display unit:
Open the circuit breakers DIR 1/2 ESS 150RH and 157RH.	The message COM CIDS 1+2 FAULT shows.
After 10 seconds close the circuit breakers DIR 1/2 ESS 150RH and 157RH.
3.In the cockpit, on the circuit breaker panel 121VU:
Close the circuit breakers DIR 1/2 NORM 151RH and 156RH.	The message COM CIDS 1+2 FAULT goes off. NOTE: Wait 5 minutes before you start the next test step.
	After 5 minutes the CIDS CAUT light stays off.
4.On the CFDS MCDU:	On the CFDS MCDU:
Push the MENU pushbutton switch.	The MCDU MENU page shows.
Push the CFDS related line selection key.	The CFDS page shows.
Push the SYSTEM REPORT/TEST related line selection key.	The SYSTEM REPORT/TEST page shows.
Push the COM related line selection key.	The SYSTEM REPORT/TEST COM page shows.
Push the CIDS1 related line selection key.	The CIDS 1(ACT) page shows.
Push the TEST related line selection key.	The CIDS 1(ACT) TEST page shows.
Push the DEU B related line selection key.	The CIDS 1(ACT) CIDS DEU B TEST page shows the message: 'ATA 23-73-47' 'TEST IN PROGRESS'.
	After some seconds the message changes from 'TEST IN PROGRESS' to: 'TEST OK'.

Subtask 23-73-47-710-050-C ** ON A/C NOT FOR ALL

F. Do this test

ACTION	RESULT
1.In the cockpit, on the circuit breaker panel 121VU:
Open the circuit breakers DIR 1/2 NORM 151RH and 156RH.
2.In the cockpit, on the circuit breaker panel 49VU:	In the cockpit, on the ECAM upper display unit:
Open the circuit breakers DIR 1/2 ESS 150RH and 157RH.	The message COM CIDS 1+2 FAULT shows.
After 10 seconds close the circuit breakers DIR 1/2 ESS 150RH and 157RH.
3.In the cockpit, on the circuit breaker panel 121VU:
Close the circuit breakers DIR 1/2 NORM 151RH and 156RH.	The message COM CIDS 1+2 FAULT goes off. NOTE: Wait 5 minutes before you start the next test step.
	After 5 minutes the CIDS CAUT light stays off.
4.On the CFDS MCDU:	On the CFDS MCDU:
Push the MENU pushbutton switch.	The MCDU MENU page shows.
Push the CFDS related line selection key.	The CFDS page shows.
Push the SYSTEM REPORT/TEST related line selection key.	The SYSTEM REPORT/TEST page shows.
Push the COM related line selection key.	The SYSTEM REPORT/TEST COM page shows.
Push the CIDS1 related line selection key.	The CIDS 1 page shows.
Push the GND SCANNING related line selection key.	The CIDS 1 GROUND SCANNING page shows the message: 'IN PROGRESS 180s'
	At the end of the test the message changes from 'IN PROGRESS 180s' to 'NO FAULT DETECTED'.

5. Close-up
Subtask 23-73-47-410-052-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the forward utility-area ceiling panel.

(a) FOR [300RH1] (DEU-B)
install 221BC (Ref. AMM TASK 25-23-42-400-001)

(3) Install the upper sidewall panel.
(a) FOR [300RH4] (DEU-B)
install 242QW (Ref. AMM TASK 25-23-43-400-001)

(4) Install the aft utility-area ceiling panel.

(a) FOR [300RH5] (DEU-B), [300RH6] (DEU-B)
install 261CC (Ref. AMM TASK 25-23-42-400-002)

Subtask 23-73-47-410-052-B ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the forward utility-area ceiling panel.

(a) FOR [300RH1] (DEU-B)
install 221BC

(b) FOR [300RH7] (DECODER/ENCODER UNIT B)
install 231JC (Ref. AMM TASK 25-23-42-400-001)

(3) Install the aft utility-area ceiling panel.

(a) FOR [300RH4] (DEU-B)
install 251KC

(b) FOR [300RH5] (DEU-B), [300RH6] (DEU-B)
install 261CC (Ref. AMM TASK 25-23-42-400-002)

Subtask 23-73-47-410-052-J ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the forward utility area - ceiling panel:
(a) FOR [300RH1] (DEU-B)
install 221BC (Ref. AMM TASK 25-23-42-400-001).
(3) Install the ceiling panel :
(a) FOR [300RH4] (DEU-B)
install 231JC (Ref. AMM TASK 25-23-41-400-001).
(b) FOR [300RH5] (DEU-B), [300RH6] (DEU-B)
install 251KC (Ref. AMM TASK 25-23-41-400-001).
(4) Install the aft utility area - ceiling panel.
(a) FOR [300RH7] (DECODER/ENCODER UNIT B), [300RH8] (DEU-B)
install 261CC (Ref. AMM TASK 25-23-42-400-002).
(5) Remove the STEPLADDER 0.5 M (1.6 FT).

Subtask 23-73-47-410-052-M ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the forward utility area - ceiling panel:
(a) FOR [300RH1] (DEU-B)
install 221BC (Ref. AMM TASK 25-23-42-400-001).
(3) Install the ceiling panel :
(a) FOR [300RH4] (DEU-B)
install 231JC (Ref. AMM TASK 25-23-41-400-001).
(b) FOR [300RH6] (DEU-B)
install 251KC (Ref. AMM TASK 25-23-41-400-001).
(4) Install the aft utility area - ceiling panel.
(a) FOR [300RH7] (DECODER/ENCODER UNIT B), [300RH8] (DEU-B)
install 261CC (Ref. AMM TASK 25-23-42-400-002).
(5) Remove the STEPLADDER 0.5 M (1.6 FT).

Subtask 23-73-47-410-052-N ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the forward utility area - ceiling panel:
(a) FOR [300RH1] (DEU-B)
install 221BC (Ref. AMM TASK 25-23-42-400-001).
(3) Install the cove light panel :
(a) FOR [300RH6] (DEU-B)
install 242WW (Ref. AMM TASK 25-23-48-400-001).
(4) Install the aft utility area - ceiling panel.
(a) FOR [300RH7] (DECODER/ENCODER UNIT B), [300RH8] (DEU-B)
install 261CC (Ref. AMM TASK 25-23-42-400-002).
(5) Remove the STEPLADDER 0.5 M (1.6 FT).

Subtask 23-73-47-410-052-Q ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the forward utility area - ceiling panel:
(a) FOR [300RH1] (DEU-B)
install 221BC (Ref. AMM TASK 25-23-42-400-001).
(3) Install the ceiling panel :
(a) FOR [300RH4] (DEU-B)
install 231JC (Ref. AMM TASK 25-23-41-400-001).
(b) FOR [300RH5] (DEU-B), [300RH6] (DEU-B)
install 251KC (Ref. AMM TASK 25-23-41-400-001).
(4) Install the aft utility area - ceiling panel:
(a) FOR [300RH7] (DECODER/ENCODER UNIT B), [300RH8] (DEU-B)
install 261CC (Ref. AMM TASK 25-23-42-400-002).
(5) Remove the STEPLADDER 0.5 M (1.6 FT).

Subtask 23-73-47-862-050-A

B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:18:52 UTC