SDR ASAA2017120822826

Service difficulty report · Autoland Sys · Boeing 737990ER

Difficulty date: December 8, 2017
Submitted: December 11, 2017
Operation: Air carrier
Aircraft: N407AS
Make and model: Boeing 737990ER
Aircraft serial: 41731
Aircraft time: 20,143 hours, 6,516 cycles
System (JASC): 2210 · Autopilot System
Part: Autoland Sys
Condition: Malfunctioned
Stage of operation: LD
How discovered: 9
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

DURING AUTOLAND, AUTOTHROTTLES FAILED TO DISENGAGE AFTER TOUCHDOWN. HAD TO MANUALLY DISCONNECT AUTOTHROTTLES. TAKE OFF WARNING HORN INTERMITTENTLY SOUNDED. GROUNDED - YES. ACCOMPLISHED DFCS BITE REF B737-900 FIM 22-11 TASK 801. TEST PASSED WITH NO FAULTS LOGGED ON LAST 4 FLT LEGS. ACCOMPLISHED LAND VERIFY TEST, BITE GRP #49, REF B737-900 AMM 22-11-00/201. ALL TESTS PASSED WITH NO FAULTS. ACCOMPLISHED AUTOTHROTTLE SYSTEM OPS TEST REF AMM 22-31-00-710-801. ALL TEST PASSED WITH NO FAULTS.