Installation of the Smoke-Detection Control Unit (SDCU)

TASK 26-17-34-400-001-A
Installation of the Smoke-Detection Control Unit (SDCU)

ZONE: 122
FIN: 10WQ ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
122	AVIONICS COMPARTMENT
811

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 26-16-00-710-001-A	Operational Check of Cargo Compartment Smoke Detection by PTT
TASK 26-17-00-710-001-A	Operational Test of the Lavatory Smoke-Detection System
Smoke-Detection Control Unit

3. Job Set-up
Subtask 26-17-34-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).

Subtask 26-17-34-865-051-A ** ON A/C NOT FOR ALL

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	AIR COND/SDCU/CHAN1	11WQ	C06
122VU	AIR COND/SDCU/CHAN2	12WQ	T18

Subtask 26-17-34-860-050-A ** ON A/C NOT FOR ALL

C. Make sure that the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 26-17-34-010-051-A ** ON A/C NOT FOR ALL

D. Make sure that the access door 811 is open.

4. Procedure
Subtask 26-17-34-420-050-A ** ON A/C NOT FOR ALL

A. Install the Smoke Detection Control Unit (SDCU)
(1) Remove the blanking caps from the electrical connector on the control unit (1) and from the receptacle on the rack (2).
(2) Put the control unit (1) on the rack (2).
(3) Push the control unit (1) to engage the connector (3).
(4) Attach the control unit (1) to its rack (2) with the knurled nut (4).

Subtask 26-17-34-865-052-A ** ON A/C NOT FOR ALL

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
49VU	AIR COND/SDCU/CHAN1	11WQ	C06
122VU	AIR COND/SDCU/CHAN2	12WQ	T18

Subtask 26-17-34-710-050-B ** ON A/C NOT FOR ALL

C. Do an operational test of the control unit (Ref. AMM TASK 26-17-00-710-001) (Ref. AMM TASK 26-16-00-710-001).

5. Close-up
Subtask 26-17-34-862-050-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) De-energize the ground service network (Ref. AMM TASK 24-42-00-862-001).

Subtask 26-17-34-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 811
(3) Remove the access platform.

[Rev.10 from 2021] 2026.03.31 23:44:24 UTC