Service difficulty report · Trim System · Boeing 7377V3

Difficulty date
July 18, 2021
Submitted
July 19, 2021
Operation
Air carrier
Aircraft
N17753
Make and model
Boeing 7377V3
Aircraft serial
30463
Aircraft time
58,626 hours, 22,203 cycles
Part
Trim System
Condition
Lack Of Lube
Location
Ailerons
Stage of operation
NR
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

PER FLIGHT CREW: HEAVY/DELAYED RESPONSE IN THE AILERONS AND RATCHETING NOISE HEARD DURING ALL ROLL INPUTS AFTER TAKEOFF. PITCH INPUTS WERE NORMAL. PERFORMED GENERAL VISUAL IN W/W, FWD E&E AND E&E OF AILERON FLT CONTROL CABLES, QUADRANTS AND ACTUATORS FOUND NO DISCREPNCIES. CREW GAVE VERBAL REPORT OF HEAVY/RACHETING MOVEMENT AT ALL STAGES OF FLT WITH A/P DISENGAGED (NO A/P). VERIFIED YOKE RACHETS PAST 8 UNITS OF TRIM ON BOTH SIDES BUT SLIGHTER LOUDER AND MORE OBVIOUS MOVING TOWARDS FULL RIGHT TRAVEL. RECOMMEND CHECKING CABLE TENSIONS AND CABLE RUN FOR ANY OBVIOUS DEFECTS DURING FAULT ISOLATION FOUND RATCHETING FEEL AND NOISE COMING FROM AILERON TRANFER MECHANISM, LUBRICATED TRANSFER MECHANISM PADDLE AND RATCHETING NOISE AND FEEL ARE NO LONGER PRESENT. PERFORMED AILERON CONTROL WHEEL FORCE TEST WITH NO FAULTS FOUND, REF FIM 27-11 TASK 813 AND AMM 27-11-00-700-805.

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