SDR ASAA2020010331756

Service difficulty report · Flight Dir · Boeing 737890

Difficulty date: January 2, 2020
Submitted: January 3, 2020
Operation: Air carrier
Aircraft: N506AS
Make and model: Boeing 737890
Aircraft serial: 35690
Aircraft time: 43,660 hours, 13,308 cycles
System (JASC): 2210 · Autopilot System
Part: Flight Dir
Condition: Malfunctioned
Location: Cockpit
Stage of operation: DE
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

CA FLIGHT DIRECTOR FAILED DESCENDING THRU FL 320 HEADING BUG WAS FROZEN AT 270 ON CA AND WOULD NOT REENGAGE INITIALLY. FLIGHT DIRECTOR RECOVERED DESCENDING THRU 9000 AND WORKED NORMAL THE REMAINDER OF FLIGHT. F/O FLIGHT DIRECTOR OPERATED NORMALLY THE ENTIRE FLIGHT. GROUNDED - YES. DFCS CHANNEL "A" LOGGED 22-11607 MCP DATA INV NO HISTORY. PERFORMED B737-800 FIM 22-11 TASK 817 AND 22-11 TASK 803. ALL TESTS PASS.