Narrative:

Aircraft was dispatched with inoperative and placarded #1 IRS -- #1 yaw dampener and overhead IRS display inoperative. On takeoff roll, captain's speed limits failed along with #1 pitch trim and TCASII. Discussions with maintenance technician concluded that there was partial failure of air data computer #1. I took into account the possibility of 1) a second air data computer computer failure would reduce us to standby instruments only. 2) route over atlantic at night. 3) other placards and failures that the flight was dispatched with. I felt that the prudent course of action was to return to jfk. Per part I manual for overweight landing, an emergency was declared. Landing weight was declared. Landing weight 322000 pounds at 200 FPM -- smooth. Xferred passenger, crew and cargo to other aircraft. Flight proceeded to sdq.

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Original NASA ASRS Text

Title: AN AIRBUS 300 IN CRUISE AT FL270 DECLARES AN EMER AND MAKES AN OVERWT LNDG DUE TO COMBINATION OF DEFERRED SYS AND INFLT FAILURES.

Narrative: ACFT WAS DISPATCHED WITH INOP AND PLACARDED #1 IRS -- #1 YAW DAMPENER AND OVERHEAD IRS DISPLAY INOP. ON TKOF ROLL, CAPT'S SPD LIMITS FAILED ALONG WITH #1 PITCH TRIM AND TCASII. DISCUSSIONS WITH MAINT TECHNICIAN CONCLUDED THAT THERE WAS PARTIAL FAILURE OF ADC #1. I TOOK INTO ACCOUNT THE POSSIBILITY OF 1) A SECOND ADC COMPUTER FAILURE WOULD REDUCE US TO STANDBY INSTS ONLY. 2) RTE OVER ATLANTIC AT NIGHT. 3) OTHER PLACARDS AND FAILURES THAT THE FLT WAS DISPATCHED WITH. I FELT THAT THE PRUDENT COURSE OF ACTION WAS TO RETURN TO JFK. PER PART I MANUAL FOR OVERWT LNDG, AN EMER WAS DECLARED. LNDG WT WAS DECLARED. LNDG WT 322000 LBS AT 200 FPM -- SMOOTH. XFERRED PAX, CREW AND CARGO TO OTHER ACFT. FLT PROCEEDED TO SDQ.

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.