Narrative:

The local south controller cleared the C208 to land on runway 25L. The pilot read back; 'cleared to land runway 25L' [tapes checked by the flm (front line manager) and confirmed this]. The pilot landed runway 25R while a B737 was holding in position on runway 25R. Prior to the incident I was offline coordinating with local north to obtain a release for a north bound IFR turbo prop and setting the sequence along with my normal duties. In my scan; I observed the C208 on final; in my observation the small aircraft did not appear out of the ordinary; but those aircraft are very difficult to see; especially at dusk. I then worked to get the attention of the ground south controller to pass him a VFR crossing strip that needed to be delivered to the ground north controller on the other side of the cab (during this is when the incident happened). I then turned my attention to the runway to continue my scan and saw the C208 rolling out on runway 25R. The asde/X never alarmed. To the best of my knowledge it was in the correct operating status and the voice checks were completed by the flm for that shift. The pilot of the B737 did comment on the frequency that the C208 landed down field.I described this as a loss of runway separation and this was not a good situation; but in my opinion there was no danger. The B737; to the best of my knowledge; was not cleared for takeoff. Once the local controller saw the situation he told the B737 to hold in position. I would imagine the C208 would have seen the B737. I do not know why he did not go around; I did not speak with the pilot. I am also not sure if the pilot was IFR or VFR; but they are typically VFR. The aircraft was on a visual approach. To the best of my knowledge the management is only filing a pilot deviation; but I wanted to submit a separate report anyway (also because the asde/X never alarmed). The local controller was rather shaken up so the flm had me close the handoff position and relieve the local south controller.I would like to give a recommendation; but I do not think there is anything else that could have been done by the controllers. The planes are very difficult to see until very short final. We as the controllers scan the best we can; but have a large area to watch and it is not wise to just stare at the approach end of the runway. I am not sure if the pilot had his landing light on; but that would have helped the local controller to see. I was doing another duty at the time of situation. The biggest thing that could have prevented the situation is if the asde/X would have alarmed.

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Original NASA ASRS Text

Title: Two Controllers and a B737 flight crew report a C208 pilot landing over the B737 in position on Runway 25R at PHX.

Narrative: The Local South Controller cleared the C208 to land on Runway 25L. The pilot read back; 'cleared to land Runway 25L' [tapes checked by the FLM (Front Line Manager) and confirmed this]. The pilot landed Runway 25R while a B737 was holding in position on Runway 25R. Prior to the incident I was offline coordinating with Local North to obtain a release for a north bound IFR turbo prop and setting the sequence along with my normal duties. In my scan; I observed the C208 on final; in my observation the small aircraft did not appear out of the ordinary; but those aircraft are very difficult to see; especially at dusk. I then worked to get the attention of the Ground South Controller to pass him a VFR crossing strip that needed to be delivered to the Ground North Controller on the other side of the cab (during this is when the incident happened). I then turned my attention to the runway to continue my scan and saw the C208 rolling out on Runway 25R. The ASDE/X never alarmed. To the best of my knowledge it was in the correct operating status and the voice checks were completed by the FLM for that shift. The pilot of the B737 did comment on the frequency that the C208 landed down field.I described this as a loss of runway separation and this was not a good situation; but in my opinion there was no danger. The B737; to the best of my knowledge; was not cleared for takeoff. Once the Local Controller saw the situation he told the B737 to hold in position. I would imagine the C208 would have seen the B737. I do not know why he did not go around; I did not speak with the pilot. I am also not sure if the pilot was IFR or VFR; but they are typically VFR. The aircraft was on a visual approach. To the best of my knowledge the management is only filing a pilot deviation; but I wanted to submit a separate report anyway (also because the ASDE/X never alarmed). The Local Controller was rather shaken up so the FLM had me close the handoff position and relieve the Local South Controller.I would like to give a recommendation; but I do not think there is anything else that could have been done by the controllers. The planes are very difficult to see until very short final. We as the controllers scan the best we can; but have a large area to watch and it is not wise to just stare at the approach end of the runway. I am not sure if the pilot had his landing light on; but that would have helped the Local Controller to see. I was doing another duty at the time of situation. The biggest thing that could have prevented the situation is if the ASDE/X would have alarmed.

Data retrieved from NASA's ASRS site as of April 2012 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.