Narrative:

First officer acknowledged an ATC clearance to climb to FL330. An FMS climb was begun from FL290 to FL330. At about FL29.6, center started a frequency change for us, and then requested if we were still at FL290. First officer replied no, we are out of FL290 climbing to FL330 as assigned. Center instructed flight to return to FL290. First officer responded that we had acknowledged climb instructions to FL330 without negative response from the center. Aircraft reached FL2.9 and began descent back to FL290. Controller stated that climb clearance had been for company flight xxcg and that there had been a stuck microphone on frequency by an air carrier Y flight. We then received a frequency change. Upon check-in with new sector we received immediate climb clearance to FL330. Pre-departure clearance used. Filed for FL330 with step to FL370 near msy. Frequency use was heavy due to push from dfw. Crew had not heard company xxcg on frequency prior. Crew not aware of stuck microphone frequency problem before climb initiated. We did hear center transmit to the air carrier Y flight involved. No frequency distortion was noted at any time. Hou center may have been controling instead of ft worth. TCASII not installed on this ship. Supplemental information from acn 191884. I remember frequency clutter, and reference about a stuck microphone from center to another airplane, about 1-21 mins prior.

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Original NASA ASRS Text

Title: ACR MLG ALT DEV IN RESPONSE TO WRONG CALL SIGN.

Narrative: FO ACKNOWLEDGED AN ATC CLRNC TO CLB TO FL330. AN FMS CLB WAS BEGUN FROM FL290 TO FL330. AT ABOUT FL29.6, CENTER STARTED A FREQ CHANGE FOR US, AND THEN REQUESTED IF WE WERE STILL AT FL290. FO REPLIED NO, WE ARE OUT OF FL290 CLBING TO FL330 AS ASSIGNED. CENTER INSTRUCTED FLT TO RETURN TO FL290. FO RESPONDED THAT WE HAD ACKNOWLEDGED CLB INSTRUCTIONS TO FL330 WITHOUT NEGATIVE RESPONSE FROM THE CENTER. ACFT REACHED FL2.9 AND BEGAN DSCNT BACK TO FL290. CTLR STATED THAT CLB CLRNC HAD BEEN FOR COMPANY FLT XXCG AND THAT THERE HAD BEEN A STUCK MIC ON FREQ BY AN ACR Y FLT. WE THEN RECEIVED A FREQ CHANGE. UPON CHK-IN WITH NEW SECTOR WE RECEIVED IMMEDIATE CLB CLRNC TO FL330. PRE-DEP CLRNC USED. FILED FOR FL330 WITH STEP TO FL370 NEAR MSY. FREQ USE WAS HVY DUE TO PUSH FROM DFW. CREW HAD NOT HEARD COMPANY XXCG ON FREQ PRIOR. CREW NOT AWARE OF STUCK MIC FREQ PROBLEM BEFORE CLB INITIATED. WE DID HEAR CENTER XMIT TO THE ACR Y FLT INVOLVED. NO FREQ DISTORTION WAS NOTED AT ANY TIME. HOU CENTER MAY HAVE BEEN CTLING INSTEAD OF FT WORTH. TCASII NOT INSTALLED ON THIS SHIP. SUPPLEMENTAL INFO FROM ACN 191884. I REMEMBER FREQ CLUTTER, AND REF ABOUT A STUCK MIC FROM CENTER TO ANOTHER AIRPLANE, ABOUT 1-21 MINS PRIOR.

Data retrieved from NASA's ASRS site as of July 2007 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.