Service difficulty report · Actuator · Cessna 750

Difficulty date
March 7, 2013
Submitted
March 11, 2013
Operation
Air carrier
Aircraft
N977AE
Make and model
Cessna 750
Aircraft serial
7500125
Aircraft time
6,703 hours, 5,040 cycles
Part
Actuator
Part number
EM407010
Part serial
273
Condition
Failed
Location
Elevator
Part time
2,101 hours, 1,471 cycles
Stage of operation
CL
How discovered
O
Nature of condition
F, J
Precautionary procedure
A

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

What was found

PILOT WRITE UP "PITCH FEEL FAIL AMBER CAS MESSAGE ILLUMINATED IN FLIGHT. ABNORMAL AMOUNT OF AFT ELEVATOR REQUIRED DURING LANDING". FAULT OCCURED SHORTLY AFTER TAKEOFF FROM KAGC, PILOT RETURNED TO KAGC. TROUBLESHOOTING REVEALED THE RIGHT ELEVATOR PITCH FEEL LINEAR ACTUATOR FAILED IN THE EXTENDED POSITION. THIS CAUSED THE CAS MESSAGE TO ILLUMINATE DUE TO THE MIS-MATCH WITH THE LEFT ACTUATOR. IT ALSO CAUSED A CHANGE IN BIAS IN THE CENTERING UNIT, WHICH LED TO THE PILOT'S PERCEPTION OF AN ABNORMAL AMOUNT OF ELEVATOR BEING REQUIRED DURING THE FLARE. THE ACTUATOR WAS REPLACED WITH AN OVERHAULED UNIT AND ALL OPERATIONAL TESTS WERE NORMAL.

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