Deactivation of the Slat and Flap Control Computer (SFCC) No. 2 Slat Channel

TASK 27-51-00-040-005-A
Deactivation of the Slat and Flap Control Computer (SFCC) No. 2 Slat Channel

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

ZONE: 128
FIN: 21CV
FIN: 22CV
Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
NO	NO	NO	1.0	1.0	1

1. Reason for the Job
MMEL 27-81-01A
SFCC SLAT CHANNEL

NOTE: For the deactivation of the SFCC No. 2 flap channel refer to TASK 27-51-00-040-001.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
128	REAR AVIONIC COMPARTMENT

C. Referenced Information

REFERENCE	DESIGNATION
TASK 20-16-00-912-001-A	Circuit Breakers Safety Practices
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 27-54-00-710-002-A	Operational Test of the Flap and Slat Systems
TASK 27-80-00-869-004-A	Reset of the Wing Tip Brake (WTB) of the Slat System on the Ground
TASK 27-81-00-710-001-A	Operational Test of the Wing-Tip Brake and the Pressure-Off Brake
TASK 27-84-00-710-001-A	Operational Test of the Slat System
TASK 31-32-00-860-001-A	Procedure to Get Access to the SYSTEM REPORT/TEST Menu Page

3. Job Set-up
Subtask 27-51-00-941-075-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Put a WARNING NOTICE(S) in position to tell persons not to operate the slats and flaps.

Subtask 27-51-00-861-057-A

B. Energize the Aircraft Electrical Circuits
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 27-51-00-865-096-A

C. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	FLIGHT CONTROLS/WTB/SLT/SYS2	11CV	P19

4. Procedure
Subtask 27-51-00-040-050-A

A. Deactivation of the Slat and Flap Control Computer (SFCC) No.2 Slat Channel

NOTE: When you do this procedure, it can be necessary to open circuit breaker 11CV (Ref. AMM TASK 20-16-00-912-001). This circuit breaker has a red threaded bush. To open this circuit breaker you need a standard wrench.

(1) Do this procedure:

ACTION	RESULT
1.On the MCDU:	On the MCDU:
get access to the Flight Controls (F/CTL) SYSTEM REPORT/TEST page (Ref. AMM TASK 31-32-00-860-001)	the F/CTL SYSTEM REPORT TEST PAGE is shown
push in the key adjacent to < SFCC1	the SFCC1 menu is shown
push in the key adjacent to < SYSTEM STATUS SLAT	< NO FAULTS > is shown except SLT 1 NO SFCC 2 DATA and/or SLT 1 NO SFCC 2 DATA CHECK WIRING AND SFCC 2
push the key adjacent to < RETURN until the SYSTEM REPORT/TEST F/CTL page is shown
push in the key adjacent to <SFCC2 NOTE: If the MCDU shows < NO RESPONSE > for SFCC 2, go to paragraph D.	the SFCC2 menu is shown
push in the key adjacent to < SYSTEM STATUS SLAT	the SYSTEM STATUS SLAT page is shown
if SLT SYS LOCKED is shown, reset the wing tip brakes of the slat system with SFCC 2 (Ref. AMM TASK 27-80-00-869-004)
if the result of the reset of the WTB is correct, go to paragraph E.
if the reset of the WTBs (of the slat system) with SFCC 2 cannot be completed satisfactorily, open the circuit breaker 11CV (Ref. AMM TASK 20-16-00-912-001).	the 28V power supply from SFCC 2 to the WTBs is disconnected.
push in the key adjacent to < RETURN until the F/CTL SYSTEM REPORT/TEST page is shown.

Subtask 27-51-00-865-078-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FAC1/26VAC	14CC1	B03
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FAC1/26VAC	14CC1	H09
** ON A/C ALL
121VU	AUTO FLT/FAC2/26VAC	14CC2	M18

Subtask 27-51-00-865-118-A

C. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	FLIGHT CONTROLS/SLT/CTL/SYS2	7CV	R21

Subtask 27-51-00-710-074-A

D. Test

NOTE: This paragraph is applicable only if the MCDU shows < NO RESPONSE > for SFCC 2.

(1) Do the Operational Test of the Slat System (Ref. AMM TASK 27-84-00-710-001).
(a) If the WTB is in operation (because of a failure of the Slat 2 channel), the "FLAP LEVER...RECYCLE" message will be shown on the ECAM.
(2) If the message to recycle the Flap control lever shows on ECAM, open the circuit breaker 11CV (Ref. AMM TASK 20-16-00-912-001).

NOTE: WTB stays open.

Subtask 27-51-00-040-053-A

E. Deactivation of the SFCC No. 2 Slat Channel (Continued)
(1) Do the Operational Test of the Flap and Slat Systems (Ref. AMM TASK 27-54-00-710-002).

NOTE: The slats will move slow.

NOTE: The circuit breaker 11CV stays open (if the c/b 11CV was opened before).

(2) Do the WTB/POB test with SFCC No. 1 (slat system) only (Ref. AMM TASK 27-81-00-710-001).

NOTE: The circuit breaker 11CV stays open (if the c/b 11CV was opened before).

(3) Make sure that the WTB/POB test was successful and that the MCDU shows:
SFCC 1
DATE: XXX XX__ UTC: XXXX
PERFORMED
NO FAULTS
RESULT NOT STORED.

NOTE: The aircraft can only be dispatched if the WTB/POB test was successful.

(4) Put the aircraft back to its initial configuration:
(a) On the MCDU, push the key adjacent to < RETURN until the CFDS MENU page is shown.
(b) On the MCDU, push the MCDU MENU key and make sure that the MCDU MAIN MENU is shown.
(5) Deactivation of the SFCC 2 slat channel:
(a) Open and safety circuit breaker 7CV.
(b) Attach a WARNING NOTICE(S) to the circuit breaker 7CV (in the cockpit) to tell persons that the slat channel for SFCC 2 is deactivated.
(c) Make an entry in the aircraft technical logbook that the SFCC No. 2 slat channel is deactivated.
(6) If the circuit breaker 11CV, was opened in the test procedure:

attach a WARNING NOTICE(S) to the circuit breaker 11CV (in the cockpit) to tell persons that the 28V power supply (from SFCC 2 to the WTB) is disconnected (Ref. AMM TASK 20-16-00-912-001).

Subtask 27-51-00-869-065-A

F. Cockpit Effects
(1) On the ECAM EWD:

The message 'F/CTL SLAT SYS 2 FAULT' shows.

(2) On the STATUS SD page:

The message 'F/CTL MAINTENANCE' can show.
The message 'SFCS MAINTENANCE' can show.

NOTE: These status messages will only show in flight phases 1 and 10.

(3) On the STATUS SD page:

The message 'SLATS SLOW' shows.

NOTE: This status message will not show in flight phases 1 and 10.

5. Close-up
Subtask 27-51-00-862-058-A

A. De-energize the Aircraft Electrical Circuits
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 27-51-00-865-105-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
49VU	AUTO FLT/FAC1/26VAC	14CC1	B03
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FAC1/26VAC	14CC1	H09
** ON A/C ALL
121VU	AUTO FLT/FAC2/26VAC	14CC2	M18

Subtask 27-51-00-942-070-A

C. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the safety barriers.
(3) Remove the warning notices, but keep the warning notices for the circuit breakers 7CV and 11CV (if 11CV was opened before).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.03.31 23:52:11 UTC