Slats - Flap Menu Shows When Slat Menu is Selected on the CFDIU

TASK 27-81-00-810-831-A
Slats - Flap Menu Shows When Slat Menu is Selected on the CFDIU

1. Possible Causes

SLAT/FLAP CONTR.COMP. [21CV]
SLAT/FLAP CONTR.COMP. [22CV]
PROX SNSR R L/G EXT 20GA
PROX SNSR L L/G EXT 21GA
PROX SNSR R L/G EXT 22GA
PROX SNSR L L/G EXT 23GA
RELAY-A/C ON GND [94CV]
RELAY-A/C ON GND [96CV]
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
AMM 27-81-00-740-002	BITE Test of the Slat and Flap Control Computers (Slat System)
ASM 278102
ASM 278103

3. Fault Confirmation
Subtask 27-81-00-740-064-A

A. Test
(1) Do a BITE test of the applicable SFCC AMM 27-81-00-740-002.

4. Fault Isolation
Subtask 27-81-00-810-080-A

A. Procedure
(1) If the flap menu comes into view when the slat menu is selected:
(a) Swop the SFCC's and repeat the test in Para. 3.A. on SLAT/FLAP CONTR.COMP. [21CV] and SLAT/FLAP CONTR.COMP. [22CV] .
(2) If the fault has moved to the other SFCC position, swop the SFCC's back and replace the SFCC that has the fault AMM 27-51-34-000-001 and AMM 27-51-34-400-001.
(3) If the fault did not move to the other SFCC position, swop the SFCC's back Ref. Para. (2).
(a) Make sure that there are no landing gear system faults (Ref. ATA 32-31-00)

NOTE: Main landing gear shock absorber proximity sensor faults will cause this failure.

For SFCC1 PROX SNSR R L/G EXT 20GA and PROX SNSR L L/G EXT 21GA
For SFCC2 PROX SNSR R L/G EXT 22GA and PROX SNSR L L/G EXT 23GA

(4) If there were any landing gear faults, do the test in Para. 3.A.
(5) If the fault continues:
(a) Swop RELAY-A/C ON GND [94CV] with RELAY-A/C ON GND [96CV]
(b) Do the test in Para. 3.A. on SFCC1 and SFCC2.
(c) If the fault moves to the other system, replace the relay in the system that now has the fault.
(d) Do the test in Para. 3.A.
(6) If the fault does not move to the other system, do a check of the aircraft wiring .

for SFCC1 from C/B 5CV to the LGCIU1 and from the RELAY A/C ON GND 94CV to SFCC1 ASM 278102.
for SFCC2 from C/B 7CV to the LGCIU2 and from the RELAY A/C ON GND 96CV to SFCC2 ASM 278103.

(a) Repair any defect found.
(b) Do the test in Para. 3.A.

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