Slats - SFCC 1 (2) Gives PCU Valveblock 25CV (26CV) Valve Sensor Message

TASK 27-81-00-810-837-A
Slats - SFCC 1 (2) Gives PCU Valveblock 25CV (26CV) Valve Sensor Message

1. Possible Causes

SLAT/FLAP CONTR.COMP. [21CV]
SLAT/FLAP CONTR.COMP. [22CV]
VALVE BLOCK SLAT 1 [25CV]
VALVE BLOCK SLAT 2 [26CV]
valve sensor
aircraft wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-51-34-000-001	Removal of the SFCC
AMM 27-51-34-400-001	Installation of the SFCC
ASM 278102
ASM 278103
AMM 27-84-53-000-001	Removal of the Valve Blocks of the Power Control Unit (Slat)
AMM 27-84-53-400-001	Installation of the Valve Blocks of the Power Control Unit (Slat)
AMM 31-32-00-860-006	Procedure to Get Access to the SYSTEM REPORT/TEST F/CTL Page

3. Fault Confirmation
Subtask 27-81-00-710-068-A

A. Test
(1) At the MCDU, access the SYSTEM REPORT / TEST page and select F/CTL> AMM 31-32-00-860-006.
(2) Select <SFCCX (where X is the No. of the applicable SFCC).
(3) Select <SFCC/TEST, to do the SFCC BITE test:

if the fault message SLT 1(2) PCU VALVEBLOCK 25CV(26CV) VALVE SENSOR 27-84-53 shows, do the Fault Isolation Procedure given in Para. 4.

(4) If the fault is intermittent and you cannot confirm this fault on the ground, do the steps that follow:
(a) Set the MCDU to the MAIN MENU of the related SFCC and get access to the TROUBLESHOOTING DATA page AMM 31-32-00-860-006.
(b) If the fault message SLT 1(2) PCU VALVEBLOCK 25CV(26CV) VALVE SENSOR 27-84-53 shows with the
fault code 005 (for a BAE SFCC) or fault code 005 or 020 (for a Diehl SFCC):

Replace the applicable valveblock as a first step (refer to the Fault Isolation Procedure).

NOTE: You can also refer to the In-Service Information (ISI) 27.51.00025 to receive more information of this intermittent fault.

4. Fault Isolation
Subtask 27-81-00-810-086-A

A. Procedure

NOTE: If you cannot confirm this fault on the ground and you get the related TROUBLESHOOTING DATA (see above), replace the applicable valveblock as a first step.

(1) Interchange SFCC1 and SFCC2
AMM 27-51-34-000-001 and AMM 27-51-34-400-001.
(a) Do the test given in Para. 3.A:
(b) If the fault moves to the other SFCC position:
1 Install the serviceable SFCC to its initial position.
2 Replace the defective SLAT/FLAP CONTR.COMP. [21CV] or SLAT/FLAP CONTR.COMP. [22CV] .
(c) If the fault does not move to the other SFCC:
1 Install the SFCCs in their initial positions.
2 Do the next step.
(2) If the fault continues:
(a) Replace the applicable VALVE BLOCK SLAT 1 [25CV] or VALVE BLOCK SLAT 2 [26CV] ,
AMM 27-84-53-000-001 and AMM 27-84-53-400-001.

NOTE: The valve sensor is not a Line Replaceable Unit (LRU) and it is necessary to replace the valve block.

(b) Do the test given in Para. 3.A.
(3) If the fault continues:
(a) Do a check of the aircraft wiring and repair as necessary ASM 278102 or ASM 278103.
(b) Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:27:50 UTC