SDR ASAA0957131

Service difficulty report · Fmc · Boeing 737890

Difficulty date: December 5, 2009
Submitted: December 7, 2009
Operation: Air carrier
Aircraft: N557AS
Make and model: Boeing 737890
Aircraft serial: 35176
Aircraft time: 13,345 hours, 3,906 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Cockpit
Stage of operation: CL
How discovered: O
Nature of condition: O
Precautionary procedure: K

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

What was found

PROGRAMMED FMC FOR 22K MAX NO ASSUME TEMP TAKEOFF. NO SPEED OR CLIMB RESTRAINTS ENTERED IN FMC. AFTER FLAPS UP AND 250 KTS SELECTED VNAV N1 WENT TO A REDUCED CLIMB VALUE (91.1) INSTEAD OF FULL RATED CLIMB. N1 SHOULD'VE BEEN 95.5 PERCENT ACCORDING TO FMC. SELECTED LVL CHG AND GOT SAME RESULT. UNABLE TO DUPLICATE DISCREPANCY NO HISTORY AND NO INFLT FAULTS LOGGED FOR LT AND RT FMC'S. FMC PARAMETERS DISCRETE AND PERFORMANCE FACTORS NORMAL. REF 34 61 0, OK FOR SERVICE.