SDR AALA202004279003

Service difficulty report · Unknown · Boeing 737823

Difficulty date: April 26, 2020
Submitted: April 27, 2020
Operation: Air carrier
Aircraft: N879NN
Make and model: Boeing 737823
Aircraft serial: 31133
Aircraft time: 26,519 hours, 10,953 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Unknown
Condition: Malfunctioned
Location: Cockpit
Stage of operation: DE
How discovered: O
Nature of condition: S
Precautionary procedure: O

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

What was found

AIRCRAFT NOT GROUNDED: FROM TOP OF DESCENT FROM FL380, FMS IN DESCENT MODE WAS LIMITING AIRSPEED FOR FLAP RESTRICTION TO 196 KNOTS. AIRCRAFT WAS CLEAN CONFIGURATION, NO OTHER ABNORMAL. SEEMS AIRCRAFT WAS ATTEMPTING TO AUTOBUG FROM TOP OF DESCENT, IGNORING ARRIVAL SPEEDS ON THE ARRIVAL. CONTINUED TO AUTOBUG ONCE WE WERE ON APPROACH. WE FLEW TOP OF DESCENT TO LANDING IN SPEED INTERVENE TO PREVENT AIRBUG. NO INFLIGHT FAULTS FOR FMS OR DFCS. FMS OPS TEST GOOD IAW MM 34-61-00.