Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Total 30000
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Company Policy; Procedure
The First Officer was the Pilot Flying. We were on vectors to Runway 18 Left. The Autopilot was on. When Flaps 20 was selected the Aircraft rolled to the right. The FO (First Officer) verbalized I am disconnecting the Autopilot to see what we have. He then made sure the Rudder trim was centered; The Aileron Trim was centered. Thrust was symmetrical flaps were symmetrical no lites. Yaw dampeners no lites Spoilers were stowed. The only thing was we could not arm the Autobrakes. There was no effect on the amount of Aileron control wheel displacement required to maintain level flight. When Flaps 25 - Then Flaps 30 were selected the roll increased to the right. The control wheel was displaced 4 - 6 units to the left on final approach to landing. The FO had to hand fly the approach. The winds were from the right at about 17 kts. The FO was a very skilled pilot; due to his extensive Air Force background and his commercial experience I had him remain the Pilot Flying. We landed without incident. We taxied to the gate. We were met by Maintenance. We had some rups in the AML for the cabin. The FO Said that we should put this uncommanded roll in the AML in the interest of safety. Maintenance also stated that due to the history with this same issue put it in the AML. I then put the write up in the AML and released the aircraft to Maintenance. Maintenance stated [aircraft] is an old bird but we can fix it. I usually do not submit a [report] for a AML entry but I was contacted by Safety and asked if I was submitting a [report] for Aircraft X. I asked Why? Safety stated that since I wrote up Aircraft Y In ZZZ and in ZZZZ that took the Aircraft out of service for quite some time. [Safety] stated that this write up in the AML for Aircraft X went right up to the Flight Department and that they feel that I am Just writing up aircraft. This is very disheartening to me; I have been a Captain since 1985 with the Airline. In the interest of safety for all concerned this needed to be put in the AML.
Captain reported after writing up an aircraft maintenance log entry for an uncommanded  roll on approach; he was questioned by the company about just writing up aircraft.