Narrative:

Aircraft was dispatched with 3 MEL's tat problem #1; autothrottle channel not defined and vacuum pump for forward lavatory. Flight proceeded normally until 800 ft AGL; the autoplt and autothrottle disconnected. Aircraft was hand flown through most of the RNAV departure. In low workload; attempts were made to reconnect autothrottle and autoplt -- no success with autothrottle; limited success with autoplt. Autoplt was able to accept flight director command vertical fpa horizontal roll or abq these commands were acceptable until we expected asel for altitude capture. The aircraft would then indicate lim and autoplt would aggressively pitch up. We attempted to engage the autoplt at cruise level. The aircraft would only maintain altitude in fpa mode. Since we were equipment limited in rvsm discussion with dispatch diverted flight into ZZZ. Aircraft was manually flown into ZZZ without incident. Callback conversation with reporter revealed the following information: the reporter said that the crew did not attempt to experiment with the various combinations of equipment in order to restore the ap and at. They were busy deciding where to take the aircraft since it could only be flown at the lower flight levels and needed to be at a maintenance station. His air carrier has not given him a cause for this event.

Google
 

Original NASA ASRS Text

Title: AN EMB190 CAPT REPORTS DIVERTING AFTER BEING UNABLE TO ENGAGE AUTOPLT AND AUTOTHROTTLE. A TAT PROBE AND ONE AUTOTHROTTLE CHANNEL WERE MEL'ED BEFORE FLT. RVSM NO USEABLE.

Narrative: ACFT WAS DISPATCHED WITH 3 MEL'S TAT PROB #1; AUTOTHROTTLE CHANNEL NOT DEFINED AND VACUUM PUMP FOR FORWARD LAVATORY. FLT PROCEEDED NORMALLY UNTIL 800 FT AGL; THE AUTOPLT AND AUTOTHROTTLE DISCONNECTED. ACFT WAS HAND FLOWN THROUGH MOST OF THE RNAV DEP. IN LOW WORKLOAD; ATTEMPTS WERE MADE TO RECONNECT AUTOTHROTTLE AND AUTOPLT -- NO SUCCESS WITH AUTOTHROTTLE; LIMITED SUCCESS WITH AUTOPLT. AUTOPLT WAS ABLE TO ACCEPT FLT DIRECTOR COMMAND VERT FPA HORIZ ROLL OR ABQ THESE COMMANDS WERE ACCEPTABLE UNTIL WE EXPECTED ASEL FOR ALT CAPTURE. THE ACFT WOULD THEN INDICATE LIM AND AUTOPLT WOULD AGGRESSIVELY PITCH UP. WE ATTEMPTED TO ENGAGE THE AUTOPLT AT CRUISE LEVEL. THE ACFT WOULD ONLY MAINTAIN ALT IN FPA MODE. SINCE WE WERE EQUIP LIMITED IN RVSM DISCUSSION WITH DISPATCH DIVERTED FLT INTO ZZZ. ACFT WAS MANUALLY FLOWN INTO ZZZ WITHOUT INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER SAID THAT THE CREW DID NOT ATTEMPT TO EXPERIMENT WITH THE VARIOUS COMBINATIONS OF EQUIPMENT IN ORDER TO RESTORE THE AP AND AT. THEY WERE BUSY DECIDING WHERE TO TAKE THE AIRCRAFT SINCE IT COULD ONLY BE FLOWN AT THE LOWER FLT LEVELS AND NEEDED TO BE AT A MAINTENANCE STATION. HIS ACR HAS NOT GIVEN HIM A CAUSE FOR THIS EVENT.

Data retrieved from NASA's ASRS site as of May 2009 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.