MD-11
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport
Aircraft
On takeoff roll First Officer called '80 KTS'; [then] around 130-140 KTS he called 'no airspeed'. [I] had normal indications and elected to continue takeoff. At approximately 300 feet AGL [I] lost flight director attitude information. Had no autopilot or auto throttles; [and no] control over FCP. First Officer had no information on his side. Notified ATC; climbed to 5;000 feet MSL on heading vectors and worked QRH checklists for multiple Level 2 alerts. During that process I asked the First Officer to switch to Captain CADC at which time I got all FLT information back [and] was able to get autopilot and auto throttles back. All Level 2 alerts cleared so I had the First Officer build an approach back to [departure airport]. On approach airspeed low end foot appeared unreliable. Made Flaps 35 landing with approximately 165 KTS airspeed; normal landing roll out.
On takeoff roll; airspeed indications only displayed 'Taxi' with digital readout and no ladder/tape or green A/S trend line. At approximately 100 KTS the indications froze and V-Speed cues were no longer displayed. I told the Captain that I had no airspeed indications; he said we were passing V1 and that he had good indications and we continued for an uneventful takeoff. Once airborne; the ladder/tape on my side returned and remained approximately 100 KTS with a red 'zipper.' Neither side had a FD displayed and ALT window on the FCP displayed dashes and we could not dial in an altitude. There were no magenta balls on either the A/S or ALT scales on the displays. The event was during a busy departure window; their vector for troubleshooting was over water with no horizon and we were trying to troubleshoot and coordinate with radar. We eventually got the First Officer CADC on Captain; which restored the Captain's FD; the First Officer's airspeed information and FD. We coordinated for expedited sequence back into [departure airport] arrival flow and the Captain performed an uneventful landing.
MD-11 flight crew reported loss of First Officer air data computer on takeoff roll. Captain continued takeoff since they were near V1; and after selecting the Captain's ADC they returned to departure airport.