Narrative:

We were cleared for the ILS23L; 3;000 ft until established and 180k to xerox. At xerox; still on approach; the controller issued the clearance 'XXX maintain 3000 ft and fly heading 140.' I initially didn't hear our call sign and thought it sounded like a clearance for another aircraft in the terminal area. After determining that the clearance was in fact for us a go around was initiated with the autopilot at first on and then disconnected; the turn to H140 was slow and altitude of 3;000 ft over shot by 550 ft.the clearance caused some level of confusion and delay since 'go around or discontinue approach' phraseology was not used by the controller. From that point better high altitude/approach and go around procedures and crew coordination were required in this situation. Better pilot/controller communication. Expecting the unexpected; with more thought given to go around procedures at a point other than minimums.

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Original NASA ASRS Text

Title: IND TRACON issued a go-around to an air carrier at 3;000 FT on approach to IND Runway 23L but the flight crew missed the command because of a nonstandard phraseology.

Narrative: We were cleared for the ILS23L; 3;000 FT until established and 180k to XEROX. At XEROX; still on approach; the controller issued the clearance 'XXX maintain 3000 FT and fly heading 140.' I initially didn't hear our call sign and thought it sounded like a clearance for another aircraft in the terminal area. After determining that the clearance was in fact for us a go around was initiated with the autopilot at first on and then disconnected; the turn to H140 was slow and altitude of 3;000 FT over shot by 550 FT.The clearance caused some level of confusion and delay since 'go around or discontinue approach' phraseology was not used by the controller. From that point better high altitude/approach and go around procedures and crew coordination were required in this situation. Better pilot/controller communication. Expecting the unexpected; with more thought given to go around procedures at a point other than minimums.

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.