SDR ASAA2019030528478

Service difficulty report · Warning System · Boeing 737990ER

Difficulty date: March 5, 2019
Submitted: March 7, 2019
Operation: Air carrier
Aircraft: N403AS
Make and model: Boeing 737990ER
Aircraft serial: 41730
Aircraft time: 25,227 hours, 8,295 cycles
System (JASC): 2210 · Autopilot System
Part: Warning System
Condition: False Activation
Location: Cockpit
Stage of operation: TX
How discovered: O
Nature of condition: N
Precautionary procedure: D

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

What was found

AFTER PUSH-BACK AND MASTER CAUTION RECALL, FLT CREW OBSERVED SPEED TRIM AND MACH TRIM CAUTION LIGHT. GROUNDED - YES. FOUND DFCS SYS "B" INOP. CYCLED C/B'S ON P6-2 B1,B2,B4,C1, C2 AND C3 REF FIM 22-11 TASK 826 AND DFCS "B" POWERED UP. PERFORMED FCC INSTALLATION TEST PER AMM 22-11-33-401-801, OPS CKS NORMAL. FCC "B" MACH TRIM AND SPEED TRIM OPS NORMAL PER FIM 22-11 TASK 801.