SDR ASAA2017101222181

Service difficulty report · Interlock · Boeing 737890

Difficulty date: October 12, 2017
Submitted: October 13, 2017
Operation: Air carrier
Aircraft: N566AS
Make and model: Boeing 737890
Aircraft serial: 35182
Aircraft time: 41,317 hours, 12,368 cycles
System (JASC): 2210 · Autopilot System
Part: Interlock
Condition: Malfunctioned
Stage of operation: NR
How discovered: O
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

AFCS ENGAGE INTERLOCK A ON P18-3 AND AFCS ENGAGE INTERLOCK B ON P6-2 FOUND OUT. ACFT GROUNDED. RESET BOTH CIRCUIT BREAKERS IAW AMM 20-60-01. DFCS FAULT HISTORY SHOWS NO ASSOCIATED DISCREPANCIES. ACCOMPLISHED FIM 22-13, TASK 821 AND FIM 22-13, TASK 822. CURRENT STATUS TEST PASSED. INITIAL EVALUATION SHOWS NO FAULTS. ACCOMPLISHED DFCS, AT LRU REPLACEMENT TEST AND LAND VERIFY BITE 49. ALL TEST PASSED. NO HISTORY LAST 30 DAYS.