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SDR ASAA0956648

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Service difficulty report · Unknown · Boeing 737890

FAA SDR system

Difficulty date
September 19, 2009
Submitted
September 21, 2009
Operation
Air carrier
Aircraft
N570AS
Make and model
Boeing 737890
Aircraft serial
35185
Aircraft time
10,198 hours, 2,925 cycles
System (JASC)
2210 · Autopilot System
Part
Unknown
Condition
Malfunctioned
Location
Autopilot Sys
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

IN DESCENT THRU 14000 WHILE IN VNAV/LNAV DESCENT AUTO WAS DOING NORMAL TRIMMING BUT MAKING A CLICK CLACK NOISE ON EACH ROTATION DISENGAGES TRIM WORKED SMOOTHLY NO NOISE, NORMAL AT 7000 RE-MESSAGE AUTOPILOT IT TRIMMED SMALL AMOUNTS USED BUT SAME CLICK CLACK NOISE NO BINDING! NOTICED DISCONNECTED A/P NORMAL SMOOTH TRIM TO L/D. PERFORMED TASK 22 11 81 710 801 STAB TRIM MOTOR TEST. TEST NORMAL NO ABNORMAL NOISE HEARD DURING TEST. GVI DURING TEST NO NOISE ON INTERFERENCE NOTED. NO HISTORY 90 DAYS. GVI CHAIN CABLE PULLEYS AND DRUM UNDER CP EVERYTHING NORMAL NO NOISE OR INTERFERENCE. SEAMC CONTACTED.