SDR ASAA2019053029539

Service difficulty report · Unknown · Boeing 737990ER

Difficulty date: May 30, 2019
Submitted: May 31, 2019
Operation: Air carrier
Aircraft: N442AS
Make and model: Boeing 737990ER
Aircraft serial: 43293
Aircraft time: 21,760 hours, 7,125 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Unknown
Condition: Malfunctioned
Location: Cockpit
Stage of operation: CR
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

UPON LEVELING OFF AT FL300, BOTH FMC SCRATCHPADS DISPLAYED "SINGLE FMC OPERATION" BOTH ND'S CONTINUED TO DISPLAY PROPER INFORMATION. COMPLIED WITH QRH CHECKLIST AND CONTINUED FLIGHT WITH FMC SOURCE SELECT SWITCH IN "BOTH ON L" POSITION. GROUNDED - YES. LT FMC IN FLIGHT FAULT SHOWED "FMC-R 'OFP MISMATCH' AND 'PRES POS LAT RATE PERFORMED FIM 34-61 TK 807, OPS NORMAL. BOTH ADIRU'S SHOWED NO FAULTS. LT AND RT FMC'S BITE NORMAL REF FIM 34-61 TK 801.