Loss of SFCC 1 (2) Because of an A/C Pin Program Fault

TASK 27-81-00-810-805-A
Loss of SFCC 1 (2) Because of an A/C Pin Program Fault

1. Possible Causes

SLAT/FLAP CONTR.COMP. [21CV]
SLAT/FLAP CONTR.COMP. [22CV]
A/C wiring at the ARINC tray interface

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	BREAK-OUT BOX (ARINC 600 TYPE)

B. 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 278108
AMM 27-84-00-710-001	Operational Test of the Slat System

3. Fault Confirmation
Subtask 27-81-00-710-054-A

A. Test
(1) Do a Bite Test of the applicable SFCC/slat system AMM 27-81-00-740-002.
(2) If the test gives a message that includes PIN PROGRAM DISAGREE, do the fault isolation.

4. Fault Isolation
Subtask 27-81-00-810-054-A

A. Procedure
(1) Interchange SFCC 1 and SFCC 2
AMM 27-51-34-000-001 and AMM 27-51-34-400-001.
(a) Do the test in Para. 3.A..
(b) If the fault moves with the SFCC 1(2):
1 Install the serviceable SFCC to its initial position.
2 Replace the defective SLAT/FLAP CONTR.COMP. [21CV] or SLAT/FLAP CONTR.COMP. [22CV] .
(c) If the fault does not move to the other SFCC:
1 Install the SFCCs to their initial positions.
2 Do the next step.
(2) If the fault continues:
(a) Use the BREAK-OUT BOX (ARINC 600 TYPE) and do a check of the applicable A/C wiring at the ARINC tray interface ASM 278108.
(b) Repair the wiring/interface.
(c) Do the test in Para. 3.A..
(3) Do the operational test of the SLAT system AMM 27-84-00-710-001.
(4) Get access to the SLT ON GROUND FAULTS and make sure that there are no faults.

5. Close-up
Subtask 27-81-00-942-054-A

A. Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 27-81-00-860-055-A

B. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:27:47 UTC