Service difficulty report · Control Unit · Boeing 737890

Difficulty date
September 18, 2019
Submitted
September 20, 2019
Operation
Air carrier
Aircraft
N529AS
Make and model
Boeing 737890
Aircraft serial
35198
Aircraft time
36,676 hours, 10,949 cycles
Part
Control Unit
Part number
762187F
Part serial
AAA7003440
Condition
Failed
Location
Bus Power
Part time
36,674 hours, 10,948 cycles
Stage of operation
AP
How discovered
O
Nature of condition
O
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

DURING VISUAL APPROACH - F.O PFD HAD NO COMMAND BARS - RECYCLED FLIGHT DIRECTOR SWITCHES. STILL NO COMMAND BARS - RA. FLAG ALSO CYCLED ON AND OFF. GROUNDED - YES. ACCOMPLISHED FIM 22-11 TASK 805. DUE TO THE #2 RA TRANSCEIVER REPLACEMENT, FOLLOWED FIM & REMOVED & REPALCED FCC-B. REF AMM 22-11-33. INSTALLATION TEST FAILED FCC-B. MSG22-11348. REMOVED & REPLACED BUS POWER CONTROL UNIT. REF AMM 24-41-21 & FIM 22-15 TASK 803. ALL TESTS PASS. RE-ACCOMPLISHED DFCS LRU REPLACEMENT TEST. ALL TESTS PASS. AIRCRAFT REMAINS HGS & AUTOLAND CAPABLE.