Narrative:

Shortly after takeoff, experienced a loss of airspeed, altitude, vertical speed and possible attitude. Transitioned immediately to standby instruments. IMC at this time and broke out of the low cloud and was able to maintain attitude. Initial clearance was 7000 ft on departure and may have possibly exceeded that and possibly exceeded 250 KTS airspeed. Aircraft was continually displaying numerous faults and failures, master warning and master caution. Weren't sure what the problem was. Did the airspeed loss, erratic unreliable checklist and determined captain's CADC was faulty. Xferred control of aircraft to first officer for an uneventful approach and landing on runway 26L in ontario. Had a jump seating MD11 captain on board was assisted with checklists and other tasks. Maintenance determined that there was blockages in the captain's and first officer's pitot tubes along with a failure of left CADC. Aircraft was subsequently repaired and operated normally for the next flight segment. I believe we took the correct initial action by transitioning immediately to the standby instruments, and luckily, were able to maintain attitude and altitude, and airspeed until we broke out of the WX.

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Original NASA ASRS Text

Title: FLT CREW OF MD11 EXPERIENCE FAILURE OF CAPT'S CADC IN IMC SHORTLY AFTER TKOF. FO ASSUMES CTL FOR RETURN LAND.

Narrative: SHORTLY AFTER TKOF, EXPERIENCED A LOSS OF AIRSPD, ALT, VERT SPD AND POSSIBLE ATTITUDE. TRANSITIONED IMMEDIATELY TO STANDBY INSTS. IMC AT THIS TIME AND BROKE OUT OF THE LOW CLOUD AND WAS ABLE TO MAINTAIN ATTITUDE. INITIAL CLRNC WAS 7000 FT ON DEP AND MAY HAVE POSSIBLY EXCEEDED THAT AND POSSIBLY EXCEEDED 250 KTS AIRSPD. ACFT WAS CONTINUALLY DISPLAYING NUMEROUS FAULTS AND FAILURES, MASTER WARNING AND MASTER CAUTION. WEREN'T SURE WHAT THE PROB WAS. DID THE AIRSPD LOSS, ERRATIC UNRELIABLE CHKLIST AND DETERMINED CAPT'S CADC WAS FAULTY. XFERRED CTL OF ACFT TO FO FOR AN UNEVENTFUL APCH AND LNDG ON RWY 26L IN ONTARIO. HAD A JUMP SEATING MD11 CAPT ON BOARD WAS ASSISTED WITH CHKLISTS AND OTHER TASKS. MAINT DETERMINED THAT THERE WAS BLOCKAGES IN THE CAPT'S AND FO'S PITOT TUBES ALONG WITH A FAILURE OF L CADC. ACFT WAS SUBSEQUENTLY REPAIRED AND OPERATED NORMALLY FOR THE NEXT FLT SEGMENT. I BELIEVE WE TOOK THE CORRECT INITIAL ACTION BY TRANSITIONING IMMEDIATELY TO THE STANDBY INSTS, AND LUCKILY, WERE ABLE TO MAINTAIN ATTITUDE AND ALT, AND AIRSPD UNTIL WE BROKE OUT OF THE WX.

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.