Service difficulty report · Trim System · Cessna 525B

Difficulty date
September 25, 2025
Submitted
October 24, 2025
Operation
Air carrier
Aircraft
N701JS
Make and model
Cessna 525B
Aircraft serial
525B0607
Aircraft time
3,060 hours, 2,123 cycles
Part
Trim System
Condition
Faulted
Location
Zone 300
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

AS THE NOSE CLIMBED ABOVE THE FLIGHT DIRECTOR USED THE ELECTRICAL NOSE DOWN TRIM BUT WAS NOT ABLE TO GET THE AIRCRAFT NOSE DOWN. THEN ATTEMPTED TO PUSH THE CONTROL YOKE FORWARD AND HAD A HARD TIME GETTING THE NOSE DOWN AND SAW THE CAS MESSAGE “ELECTRICAL TRIM FAILURE” AS PIC TOOK CONTROL OF THE AIRCRAFT IT SUDDENLY PITCHED NOSE DOWN AND HAD TO AGGRESSIVELY PULL BACK ON THE YOKE. INSPECTED ELECTRIC TRIM SERVO FOR WEAR AND SHAVINGS NO DEFECTS NOTED, CHECKED ELEVATOR TRIM ACTUATOR PUSHROD BOLTS FOR FREEDOM OF MOVEMENT CHECKED GOOD. ELEVATOR TRIM SERVO CABLE TENSIONS CHECK GOOD. ELECTRIC TRIM OPERATION CHECK GOOD. DOWNLOADED ARES DATA AND G3000 ASSERT DATA AND REVIEWED BY TEAM 525, DETERMINED NO FAULT FOUND.

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