Fault Message:

DAU4A 429 / SFCU#2/ WIRING

Fault Code:

2752006STD

Associated CAS:

SLAT FLAP BIT
(Advisory)

One of the conditions that follow occurs:

• Slat/Flap Control Unit (SFCU) 2 does not receive input from the Data Acquisition Unit (DAU) 4 Channel A
• The data is invaliD

NOTE: The DAU needs to get both channel failed in order to post this fault.

• Data Acquisition Unit (DAU) 4 (A31)
• Slat/Flap Control Unit (SFCU) 2 (A95)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

This fault may be posted due to the SFCU powering up prior to the DAU#4. This fault will clear automatically when the DAU#4 powers up and provides the General purpose ARINC 429 information. Performing a SLAT FLAP RESET on the EMS CDU may clear this fault.

NOTE: Wait at least one minute after SFCU reset to allow self test to run.

1. Perform troubleshooting to related systems if the DAU 4 is reporting a fault.
   NOTE:

   • Other LRU’s receiving the DAU 4 channel A ARINC inputs are: CPC 2, SPC CH. B, EGPWS, ACSC 2, EVMU, BMC 2 and LGECU
   • Other LRU’s receiving the DAU 4 channel B ARINC inputs are: CPC 2, SPC CH. B, ACSC 2, EVMU and BMC 2

2. Swap SFCU 2 with SFCU 1.

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

3. Replace DAU 4.
4. Do close out.