SDR ASAA2015120214083

Service difficulty report · Warning Flag · Boeing 737990ER

Difficulty date: December 2, 2015
Submitted: December 4, 2015
Operation: Air carrier
Aircraft: N478AS
Make and model: Boeing 737990ER
Aircraft serial: 44105
Aircraft time: 1,606 hours, 496 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Warning Flag
Condition: False Activation
Stage of operation: NR
How discovered: 9
Nature of condition: N
Precautionary procedure: O

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

What was found

MAP FAILURE FLAG DISPLAYED ON CAPTAINS ND. MAGNETIC COURSE DISAPPEARED. SELECTED FMC, BOTH ON R, DISPLAY RETURNED TO NORMAL. ACFT GROUNDED. PERFORMED ADIRS BITE PROCEDURE NO CURRENT STATUS FAULTS AND NO INFLIGHT FAULTS NOTED REF FIM TASK 34-21, TASK 801. ACCOMPLISHED CDS BITE PROCEDURES, NO CURRENT STATUS FAULTS NOTED AND NO INFLIGHT STATUS FAULTS NOTED REF FIM TASK 31-62, TASK 801. FMC SELECT SWITCH IN NORMAL POSITION NO DEFECTS NOTED. ALL INDICATIONS NORMAL.