Message Name:

DISC INTF MOV DCPC/ SFCU#1/WRG

Message Code:

2751249STD

MOVING 1/FLAPS IN MOTION discrete output from the Slat / Flap Control Unit 1 (SFCU) is defective.

• Slat / Flap Control Unit 1 (SFCU) (A124)
• DC Power Center (DCPC) (A63)
• DC Power Center (DCPC) (A63)/Primary Logic Card 1 (PLC)
• DC Power Center (DCPC) (A63)/Primary Logic Card 2 (PLC)
• DC Power Center (DCPC) (A63)/Primary Logic Card 3 (PLC)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

NOTES:

• The DCPC provides a 28 Volts DC discrete signal to the SFCU. The SFCU grounds this signal when the flap system is in motion. Performing a SLAT FLAP RESET on the EMS CDU may clear this fault.
• Wait at least one minute after SFCU reset to allow self test to run.

1. Interchange SFCU 1 with SFCU 2 and confirm that they are installed properly and securely. Select a different Slat Flap Control Handle position.

   1. If system checks are good, replace SFCU 1 and do close out.
   2. If fault remains, continue with next step.

2. Remove SFCU 1 and perform voltage check on the connector A124AP1 as follow:

   SFCU 1	Expected Result	Result
   A124AP1-16	28 Volt

   1. If there is 28 Volts, do close out.
   2. If there is no 28 Volts, continue with next step.

3. Perform wiring checks as follow:

   From	To	Result
   A124AP1-16	A63P1-M

   1. If wiring checks are not good, repair defective wiring as required and do close out.
   2. If wiring checks are good, continue with next step.

4. Remove the Primary Logic Cards one at a time and apply aircraft power.

   1. If fault clears after removal of any one primary logic card, replace that specific card and do close out.
   2. If fault remains, continue with next step.

5. Remove all three DCPC Primary Logic Cards. Perform wiring check as follows:

   From	To	Result
   P110B-5	A63P1-M
   P210B-5	A63P1-M
   P310B-5	A63P1-M
   Aircraft Ground	A63P1-M

   1. If wiring checks are not good, repair defective wiring as required and do close out.
   2. If wiring checks are good, continue with next step.
      CAUTION: TO PREVENT DAMAGE TO THE ACPC MOTHER BOARD CONNECTORS, ENSURE THAT THE JUMPER WIRE PINS OUTSIDE DIAMETER (OD) DOES NOT EXCEED 0.025 INCH.

6. Replace DCPC.
7. Do close out.