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SDR ASAA2016072817558

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Service difficulty report · Fmc · Boeing 737990ER

FAA SDR system

Difficulty date
July 28, 2016
Submitted
August 1, 2016
Operation
Air carrier
Aircraft
N453AS
Make and model
Boeing 737990ER
Aircraft serial
36354
Aircraft time
10,294 hours, 3,335 cycles
System (JASC)
3460 · Flight Management Computing Hardware System
Part
Fmc
Part number
1762000101
Part serial
008400
Condition
Malfunctioned
Location
Left
Part time
10,301 hours, 3,340 cycles
Stage of operation
NR
How discovered
9
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

LEFT FMC FAILED ENROUTE, THEN CORRECTED ITSELF WITHIN A MINUTE. ACFT GROUNDED. REMOVED & REPLACED THE LEFT FMC AS A PRECAUTION, IAW AMM TASK 34-61-02. ACCOMPLISHED FMC SOFTWARE CROSSLOAD, IAW AMM TASK 34-61-00-470-806 & VERIFIED CORRECT SOFTWARES (OPS, OPC, NDB, MEDB, ADDB, LDDB-DRAG FACTOR). GROUND FUNCTIONAL CHECK NORMAL, IAW AMM TASK 34-61-00-710-801. REPOSITIONED FMC SELECTOR SWITCH BACK TO NORMAL POSITION.