Slat Menu Not Available On The CFDIU, Fault Related to the SFCC Arinc Output

TASK 27-81-00-810-812-A
Slat Menu Not Available On The CFDIU, Fault Related to the SFCC Arinc Output

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, installation and pin program wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-51-00-740-002	BITE Test of the Slat and Flap Control Computers (Flap System)
AMM 27-51-34-000-001	Removal of the SFCC
AMM 27-51-34-400-001	Installation of the SFCC
ASM 278102
ASM 278103

3. Fault Confirmation
Subtask 27-81-00-740-055-A

A. Test
(1) Make sure that the flap channel 1 (2) is on.
(2) Do a BITE test of the applicable SFCC AMM 27-51-00-740-002.

4. Fault Isolation
Subtask 27-81-00-810-061-A

A. Procedure
(1) If the slat menu is not available:
(a) Interchange the SFCC's
AMM 27-51-34-000-001 and AMM 27-51-34-400-001.
(b) Do again the test in Para. 3.A. on the SLAT/FLAP CONTR.COMP. [21CV] and the SLAT/FLAP CONTR.COMP. [22CV] .
(c) If the fault moves to the other SFCC position:
1 Install the serviceable SFCC to its initial position.
2 Replace the defective SFCC.
(d) If the fault does not move to the other SFCC position:
1 Install the SFCCs to their initial positions.
2 Do the next step.
(2) Make sure that there are no landing gear system faults. Main landing gear shock absorber proximity sensor faults will cause these failures.

For SFCC 1 PROX SNSR R L/G EXT 20GA and PROX SNSR L L/G EXT 21GA
For SFCC 2 PROX SNSR R L/G EXT 22GA and PROX SNSR L L/G EXT 23GA

(3) If there are landing gear faults, do the test in Para. 3.A.
(4) If the fault continues:
(a) Interchange the RELAY-A/C ON GND [94CV] with the RELAY-A/C ON GND [96CV] .
(b) Do the test in Para. 3.A. on SFCC 1 and SFCC 2.
(c) If the fault moves to the other system, replace the relay in the system that has the fault.
(d) Do the test in Para. 3.A.
(5) If the fault does not move to the other system, do a check of the aircraft wiring, installation and pin program wiring:

For SFCC 1 from C/B 5CV to the LGCIU 1 and from the RELAY A/C ON GND 94CV to the SFCC 1 ASM 278102.
For SFCC 2 from C/B 7CV to the LGCIU 2 and from the RELAY A/C ON GND 96CV to the SFCC 2 ASM 278103.

(a) If necessary, repair the defective items.
(b) Do the test in Para. 3.A.
(6) If the fault continues, make sure that no installation pin program fault occurred (refer to the TSM 27-81-00-810-833).

[Rev.8 from Aug 2018] 2026.04.04 04:27:48 UTC