Fault Message:

FLT CONT UNIT #1 [FAN #2 FAULT]

Fault Code:

27662251SX

Associated CAS:

None

Fan 2 in the Flight Control Unit (FCU) 1 is not operative.

• Flight Control Unit (FCU) 1 Fan 2

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

It is not an AOG condition for a fan failure in FCU and therefore no CAS message is posted. Replace affected FCU when available.

• Each Flight control Module (FCM) commands and monitors one FAN
• FAN test is performed during CPOST of the Flight Control Unit (FCU) in three steps:

  1. FAN 's power supply test.
  2. Command FAN validity check.
  3. FAN rotation check.

     NOTE: In the case of any FAN failure detected on CPOST, there is no effect on FCU operation (i.e wait for next scheduled maintenance)

• FCU operating.

  1. With the Flight Control Units (FCU-9) pre-amdt D (amdt D done on attrition since Oct 2004), FAN A (FCM A) operate when temperature is over 50 °C and FAN B (FCM B) triggers at 20 °C (Airflow direction comes from the LRU)
  2. With the Flight Control Units (FCU-9) amdt D (cut in s/n 650 and up), both FANs operate when temperature is over 20 °C (Airflow direction goes inside the LRU)
     

1. Replace FCU 1.
2. Do close out.