SDR ASAA201912031488

Service difficulty report · Unknown · Boeing 737990ER

Difficulty date: December 2, 2019
Submitted: December 4, 2019
Operation: Air carrier
Aircraft: N491AS
Make and model: Boeing 737990ER
Aircraft serial: 44109
Aircraft time: 16,252 hours, 5,267 cycles
Engine: Cfmint CFM567B27E
System (JASC): 2210 · Autopilot System
Part: Unknown
Condition: Malfunctioned
Stage of operation: TX
How discovered: V
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

TWICE ON THE GROUND AND ONCE IN FLIGHT AT CRUISE, VNAV MODE EXITED, ADDITIONALLY, FMA REMAINED IN TOGA MODE ON DEPARTURE, MANUALLY SELECTED DESIRED MODE(S) W/MCP CONTROLS. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 22-11 TASK 831, FMCS BITE - NO FAULTS ADIRS BITE- NO FAULTS. FQIS BITE NO FAULTS. DFCS BITE NO FAULTS. NO 30 DAY HISTORY.