Narrative:

Upon initial contact with approach we were told to expect the visual or RNAV runway xxr. At approximately mid field right downwind we were instructed by approach control to contact tower. Upon contact with tower we were cleared to land on runway xxr. We continued our descent and approach. A little while later; tower instructed us to return to approach. Approach control advised us of a possible pilot deviation as we were not cleared for an approach. We were given a base turn and asked if the airport was in sight. We were then cleared for a visual approach and again instructed to contact the tower. In hindsight; the instruction to contact the tower came at an unusual time; mid field left downwind. But when cleared to land by the tower; I thought nothing more of it. It was the instruction to return to approach and the subsequent notification of a potential pilot deviation that causes me to question the initial instruction.pay closer attention when instructions are given in a non-normal order/environment.

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Original NASA ASRS Text

Title: Air carrier flight crew reported they were informed by ATC of a possible altitude deviation.

Narrative: Upon initial contact with Approach we were told to expect the visual or RNAV Runway XXR. At approximately mid field right downwind we were instructed by Approach Control to contact Tower. Upon contact with Tower we were cleared to land on Runway XXR. We continued our descent and approach. A little while later; Tower instructed us to return to approach. Approach Control advised us of a possible pilot deviation as we were not cleared for an approach. We were given a base turn and asked if the airport was in sight. We were then cleared for a visual approach and again instructed to contact the Tower. In hindsight; the instruction to contact the Tower came at an unusual time; mid field left downwind. But when cleared to land by the Tower; I thought nothing more of it. It was the instruction to return to approach and the subsequent notification of a potential pilot deviation that causes me to question the initial instruction.Pay closer attention when instructions are given in a non-normal order/environment.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.