SDR ASAA2016070817304

Service difficulty report · Control Panel · Boeing 737990ER

Difficulty date: July 8, 2016
Submitted: July 12, 2016
Operation: Air carrier
Aircraft: N479AS
Make and model: Boeing 737990ER
Aircraft serial: 60576
Aircraft time: 4,030 hours, 1,315 cycles
System (JASC): 2210 · Autopilot System
Part: Control Panel
Part number: 4082260939
Part serial: 98031336
Condition: Failed
Location: Flight Deck
Part time: 44,644 hours, 22,958 cycles
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

BOTH GREEN LIGHTS IN "HDG SEL" BUTTTON ON AFCS MCP INOP. ALL BUTTON FUNCTIONS ARE NORMAL. ACFT GROUNDED. REMOVED AND REPLACED MODE CONTROL PANEL IAW AMM 22-11-34-740-80, OPS NORMAL IAW AMM 22-11-34-740-801. ACCOMPLISHED DFCS MCP LRU INTERFACE TEST, GROUP BITE 32 AND LAND VERIFY TEST, GROUP BITE 49, BOTH TEST PASSED IAW AMM 22-11-00/201. ACCOMPLISHED HGS FCC/AT SENSOR DATA TEST, OPS NORMAL, IAW MMS 34-36-00.