Slats - SFCC TEST Gives the Message NO FAULTS BUT

TASK 27-81-00-810-835-A
Slats - SFCC TEST Gives the Message NO FAULTS BUT

1. Possible Causes

2. Fault Confirmation
Subtask 27-81-00-710-066-A

A. Test
(1) Do Para. 4. if the SLATS SFCC TEST gives the message NO FAULTS BUT, with any of the messages that follow:

OTHER SFCC ARM SIGNAL NOT TESTED
or
WTB SET
and/or
NO WTB POWER
LH WTB SOLENOID S/C (or O/C)
RH WTB SOLENOID S/C (or O/C)
LH APPU FAULT
FPPU FAULT
RH APPU FAULT
VPS FAULT

3. Fault Isolation
Subtask 27-81-00-810-084-A

A. Procedure
(1) At the MCDU access the CFDS MENU then LAST LEG REPORT to see if a related fault message was given during normal system operation. The table that follows shows the relationship between the messages given during the SFCC TEST and normal mode, it also gives the related trouble shooting task. Do Para. 4.A. of the applicable task.

NOTE: A fault message given during normal mode will make sure that the fault identified during the SFCC TEST is correct. It will also give the FIN of the defective component.

SFCC TEST MESSAGE	CFDS LAST LEG REPORT MESSAGE	TS TASK IN 27 81 00
OTHER SFCC ARM SIGNAL NOT TESTED	SLT 1 (2) NO SFCC 2 (1) DATA	826
NO WTB POWER	SLT 1 (2) C/B 9CV (11CV)	821
LH WTB SOLENOID S/C (or O/C)	SLT LH WTB BLU (GRN) SOLENOID 35CV OR WIRING TO SLT 1 (2)	822
RH WTB SOLENOID S/C (or O/C)	SLT RH WTB BLU (GRN) SOLENOID 36CV OR WIRING TO SLT 1 (2)	823
LH APPU FAULT FPPU FAULT RH APPU FAULT	LH SLT APPU 31CV OR WIRING TO SLT 1 (2) SLT FPPU 28CV OR WIRING TO SLT 1 (2) RH SLT APPU 32CV OR WIRING TO SLT 1 (2)	807 806 807
VPS FAULT	SLT 1 (2) PCU VALVEBLOCK 25CV (26CV) VALVE SENSOR	837

NOTE: The LAST LEG REPORT messages shown are for SFCC 1, the items in ( ) are for SFCC 2.

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