Service difficulty report · Servo · Lear 60LEAR

Difficulty date
January 23, 2026
Submitted
January 28, 2026
Operation
General aviation
Aircraft
N420KV
Make and model
Lear 60LEAR
Aircraft serial
60197
Aircraft time
8,713 hours, 5,285 cycles
Part
Servo
Part serial
46YY
Condition
Weak
Location
Zone 200
Stage of operation
CL
How discovered
O
Nature of condition
F
Precautionary procedure
A

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

What was found

ON 1/23/2026 N420KV CYO420 WAS DEPARTING KORL AND WHILE THE AIRCRAFT WAS CLIMBING WITH THE AUTOPILOT ENGAGED, THE CAPTAIN REPORTED THE PITCH CONTROL WAS UNSTABLE. THE CONTROL COLUMN WAS MOVING BACK AND FORTH AND WOULD STOP WHEN AUTOPILOT WAS DISENGAGED. THE TRIP CONTINUED AT A LOWER ALTITUDE WITH AP DISENGAGED AND LANDED SAFELY AT KJAX. LOCAL MAINTENANCE WAS CALLED TO TROUBLE SHOOT THE AUTO PILOT PITCH SYSTEM. IT WAS DETERMINED THAT THE PITCH SERVO WAS THE ISSUE. THE SERVO WAS REPLACED AND A GROUND TEST COMPLETED - NO DISCREPANCIES NOTED. ALL AUTOPILOT SYSTEM FUNCTIONS WERE NORMAL. A REPOSITION/TEST FLIGHT WAS COMPLETED WITH ALL AUTOPILOT FUNCTIONS REPORTED TO BE NORMAL.