Flaps - SFCC TEST Gives the Message NO FAULTS BUT

TASK 27-51-00-810-850-A
Flaps - SFCC TEST Gives the Message NO FAULTS BUT

1. Possible Causes

2. Fault Confirmation
Subtask 27-51-00-710-078-A

A. Test
(1) Do the fault isolation procedure if the FLAPS 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 27-51-00-810-103-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 51 00
OTHER SFCC SIGNAL NOT TESTED	FLP 1 (2) NO SFCC 2 (1) DATA	804
NO WTB POWER	FLP 1 (2) WTB C/B 10CV (12CV)	835
LH WTB SOLENOID S/C (or O/C)	FLP LH WTB BLU (YEL) SOLENOID 33CV OR WIRING TO FLP 1 (2)	836
RH WTB SOLENOID S/C (or O/C)	FLP RH WTB BLU (GRN) SOLENOID 34CV OR WIRING TO SLT 1 (2)	837
LH APPU FAULT FPPU FAULT RH APPU FAULT	LH FLP APPU 29CV OR WIRING TO FLP 1 (2) FLP FPPU 27CV OR WIRING TO FLP 1 (2) RH FLP APPU 30CV OR WIRING TO FLP 1 (2)	809 808 809
VPS FAULT	FLP 1 (2) PCU VALVE BLOCK 23CV (24CV) VALVE SENSOR	852

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 04:27:40 UTC