Flap Menu Not Available On The CFDIU, Fault Related to the SFCC ARINC Output

TASK 27-51-00-810-844-A
Flap 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 [95CV]
RELAY-A/C ON GND [97CV]
aircraft wiring, installation and pin program wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 27-51-00-810-846-A	Flap Pin Program Disagree Installation Fault
AMM 27-51-00-740-002	BITE Test of the Slat and Flap Control Computers (Flap System)
ASM 275102
ASM 275103
AMM 27-51-34-000-001	Removal of the SFCC
AMM 27-51-34-400-001	Installation of the SFCC

3. Fault Confirmation
Subtask 27-51-00-740-070-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 27-51-00-810-095-A

A. Procedure
(1) If the flap menu is not available:

Interchange the SFCC's and do again the test in Para. 3.A. on the SLAT/FLAP CONTR.COMP. [21CV] and the SLAT/FLAP CONTR.COMP. [22CV] .
AMM 27-51-34-000-001 and AMM 27-51-34-400-001.

(a) If the fault moves to the other SFCC position:
1 Put the serviceable SFCC back in its initial position.
2 Replace the unserviceable SFCC.
(b) If the fault does not move to the other SFCC:

Install the SFCCs in their initial positions.

(2) Make sure that there are no landing gear system faults. Main landing gear shock absorber proximity sensor faults will cause this failure.

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 [95CV] with the RELAY-A/C ON GND [97CV] .
(b) Do the test in Para. 3.A. on the 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 6CV to the LGCIU 1 and from the RELAY A/C ON GND 95CV to SFCC 1 ASM 275102.
For SFCC 2 from C/B 8CV to the LGCIU 2 and from the RELAY A/C ON GND 97CV to SFCC 2 ASM 275103.

(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 (Ref. TSM TASK 27-51-00-810-846).

[Rev.8 from Aug 2018] 2026.04.04 04:27:40 UTC