Narrative:

I cleared air carrier X for the ILS 8L approach and subsequently transferred communications to the local control north position. I issued the frequency correctly as 120.72 and the pilot read back 120.7. The aircraft continued on the approach and approximately 10 miles later; the final monitor realized that air carrier X had not checked in with the tower. By the time the problem was identified; vertical separation had been lost with the aircraft on the simultaneous approach to runway 8R. The 8R aircraft was broken out but not prior to separation being lost. Perhaps ensuring the appropriate and correct frequencies are on the applicable charts and simply saying 'contact tower' would be helpful. Other than that; I can improve on my hear back and read back skills.

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Original NASA ASRS Text

Title: I90 Controller described a break out event during simultaneous approach procedures caused by an incorrect frequency read back that was not noted by the controller.

Narrative: I cleared Air Carrier X for the ILS 8L approach and subsequently transferred communications to the Local Control North position. I issued the frequency correctly as 120.72 and the pilot read back 120.7. The aircraft continued on the approach and approximately 10 miles later; the Final Monitor realized that Air Carrier X had not checked in with the Tower. By the time the problem was identified; vertical separation had been lost with the aircraft on the simultaneous approach to Runway 8R. The 8R aircraft was broken out but not prior to separation being lost. Perhaps ensuring the appropriate and correct frequencies are on the applicable charts and simply saying 'Contact Tower' would be helpful. Other than that; I can improve on my hear back and read back skills.

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.