Data Fault Between SFCC 1 and SFCC 2. Loss of Cross-computer Link or Faulty Data

TASK 27-51-00-810-806-A
Data Fault Between SFCC 1 and SFCC 2. Loss of Cross-computer Link or Faulty Data

NOTE: If the SFCC identified as sending NO DATA is under MMEL or failed, this procedure is not applicable. This fault is because of the SFCC failure or MMEL condition.

1. Possible Causes

SLAT/FLAP CONTR.COMP. [21CV]
SLAT/FLAP CONTR.COMP. [22CV]
aircraft wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 275108
AMM 27-51-34-000-001	Removal of the SFCC
AMM 27-51-34-400-001	Installation of the SFCC
AMM 27-54-00-710-001	Operational Test of the Flap System
AMM 31-32-00-860-006	Procedure to Get Access to the SYSTEM REPORT/TEST F/CTL Page

3. Fault Confirmation
Subtask 27-51-00-865-064-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B07
121VU	FLIGHT CONTROLS/FLP/CTL AND/MONG/SYS2	8CV	Q21

Subtask 27-51-00-710-055-A

B. Reset and Intialization.
(1) At the circuit breakers:
(a) Open the circuit breakers.
(b) Wait for 3 seconds and close the circuit breakers.
(c) Wait for 60 seconds and do the next step.
(2) At the MCDU set the SYSTEM REPORT/TEST FLT CTL page AMM 31-32-00-860-006:
(a) Set the SFCC related to the flap channel which reported the loss of data.
(b) At the applicable SFCC1 (or SFCC2) SYSTEM STATUS FLAP page:

If the message FLP1 NO SFCC2 DATA (or FLP2 NO SFCC1 DATA) is shown, do the fault isolation procedure given in Para. 4.A.
If a different message is shown, do the trouble shooting procedure related to the message.
If no message is shown, no further maintenance action is necessary.

4. Fault Isolation
Subtask 27-51-00-810-055-A

A. Procedure
(1) Interchange SFCC 1 with SFCC 2,
AMM 27-51-34-000-001 and AMM 27-51-34-400-001.
(2) Do the test given in Para. 3.B.(2):

If the message stays the same, do step (6)
If the message goes, do the next step.

(3) Replace the SLAT/FLAP CONTR.COMP. [21CV] or SLAT/FLAP CONTR.COMP. [22CV] in the flap channel which reported the loss of data.
(4) Make sure that the serviceable SFCC is installed in its initial position.
(5) If the fault continues, do the next step:

Replace the opposite SFCC which was not replaced in step (3).

(6) If the fault continues, do the next step:

Do a check and repair the aircraft wiring between SFCC 1 and SFCC 2 ASM 275108.

(7) Do the operational test of the flap system AMM 27-54-00-710-001.

[Rev.8 from Aug 2018] 2026.04.04 04:39:14 UTC