SDR ASAA2016041516416

Service difficulty report · Control Unit · Boeing 737890

Difficulty date: April 15, 2016
Submitted: April 18, 2016
Operation: Air carrier
Aircraft: N506AS
Make and model: Boeing 737890
Aircraft serial: 35690
Aircraft time: 30,258 hours, 9,238 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Control Unit
Condition: Malfunctioned
Stage of operation: TX
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

UPON BLOCKING, THE EXTERNAL POWER DROPPED OFF ABOUT 4 TIMES . THE APU STARTED AND PUT ON THE BUSES. RT MCDU WENT BLANK AND WOULD NOT REPOWER UP. ACFT GROUNDED. FIM 34-61, TASK 809, RESET POWER TO F/O`S MCDU. MDCU POWER RESTARTED. ACFT RELEASED TO ETOPS SERVICE.