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SDR ASAA2018123177618

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Service difficulty report · Fmc · Boeing 737990ER

FAA SDR system

Difficulty date
December 27, 2018
Submitted
December 31, 2018
Operation
Air carrier
Aircraft
N435AS
Make and model
Boeing 737990ER
Aircraft serial
43292
Aircraft time
20,840 hours, 6,848 cycles
System (JASC)
3460 · Flight Management Computing Hardware System
Part
Fmc
Condition
Malfunctioned
Stage of operation
DE
How discovered
O
Nature of condition
P
Precautionary procedure
O

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

What was found

BOTH FMC'S FAILED DURING DESCENT. VTK DISPLAYED ON CAPT'S DISPLAY. NORMAL OPS RESTORED AFTER ABOUT 30 SECONDS. QRC PROCEDURE WAS NOT USED. GROUNDED - YES. FMC R LOGGED FMC-L PRES POS LAT RATE FAULT LEG 1 & FMC LEFT & RIGHT LOGGED CDU-R GRD FAULT. COMPLETED B737-900 FIM 34-21 TASK 801, ADIRS BITE, NO FAULTS NOTED. COMPLETED FIM 34-61 TASK 824, ADIRS FAULT ISOLATION. COMPLETED FIM 34-61 TASK 804, CONTROL DISPLAY UNIT BLANKS, NO FAULTS NOTED. COMPLETED FIM 34-61 TASK 801 FMC BITE #1 & #2 FMC NO FAULTS NOTED.