Narrative:

On a pilot demonstration flight at dvt while departing runway 7R for right traffic landing runway 7R dvt in an LR40. The pilot in the left seat with no learjet experience and myself in the right as a demonstration pilot and another demonstration pilot in the middle acting as safety pilot. While on departure I looked right for traffic and said clear right then I heard a pop sound and the pilot said it will not turn. I looked at the yoke and could see he had somehow hit the roll disconnect which allows the left yoke to fly with the spoilerons and the right yoke to use the ailerons via cables. Because the yokes were at different angles and the aircraft was turning left I said I have the controls. I flew the aircraft straight ahead because of terrain and tried to reconnect the yokes but I had to keep the right yoke almost full right to keep wings level. Then I noticed that the aileron trim was trimmed down full left trim; I centered the trim and reconnected the controls. At this time deer valley tower said we were getting near scottsdale airspace; after a quick control check I turned right downwind for runway 7R at dvt and at about midfield handed over the controls to the pilot in the left seat. The maximum altitude achieved was 2200 ft AGL and I am not sure of how close we flew to sdl. Once on the ground I called dvt tower to explain the situation. I asked if any calls or any paperwork on my behalf was needed and the controller told me nothing was required. The #1 leading factor was that this pilot was not given a chance for a full demonstration so cockpit familiarization was at a lower than normal level. To prevent reoccurrence I will not be talked into a non standard demonstration in the future.

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Original NASA ASRS Text

Title: LEAR LR40 FLT CREW HAS CTL DIFFICULTIES DEPARTING DVT.

Narrative: ON A PLT DEMO FLT AT DVT WHILE DEPARTING RWY 7R FOR R TFC LNDG RWY 7R DVT IN AN LR40. THE PLT IN THE L SEAT WITH NO LEARJET EXPERIENCE AND MYSELF IN THE R AS A DEMO PLT AND ANOTHER DEMO PLT IN THE MIDDLE ACTING AS SAFETY PLT. WHILE ON DEP I LOOKED R FOR TFC AND SAID CLR R THEN I HEARD A POP SOUND AND THE PLT SAID IT WILL NOT TURN. I LOOKED AT THE YOKE AND COULD SEE HE HAD SOMEHOW HIT THE ROLL DISCONNECT WHICH ALLOWS THE L YOKE TO FLY WITH THE SPOILERONS AND THE R YOKE TO USE THE AILERONS VIA CABLES. BECAUSE THE YOKES WERE AT DIFFERENT ANGLES AND THE ACFT WAS TURNING L I SAID I HAVE THE CTLS. I FLEW THE ACFT STRAIGHT AHEAD BECAUSE OF TERRAIN AND TRIED TO RECONNECT THE YOKES BUT I HAD TO KEEP THE R YOKE ALMOST FULL R TO KEEP WINGS LEVEL. THEN I NOTICED THAT THE AILERON TRIM WAS TRIMMED DOWN FULL L TRIM; I CTRED THE TRIM AND RECONNECTED THE CTLS. AT THIS TIME DEER VALLEY TWR SAID WE WERE GETTING NEAR SCOTTSDALE AIRSPACE; AFTER A QUICK CTL CHK I TURNED R DOWNWIND FOR RWY 7R AT DVT AND AT ABOUT MIDFIELD HANDED OVER THE CTLS TO THE PLT IN THE L SEAT. THE MAX ALT ACHIEVED WAS 2200 FT AGL AND I AM NOT SURE OF HOW CLOSE WE FLEW TO SDL. ONCE ON THE GND I CALLED DVT TWR TO EXPLAIN THE SITUATION. I ASKED IF ANY CALLS OR ANY PAPERWORK ON MY BEHALF WAS NEEDED AND THE CTLR TOLD ME NOTHING WAS REQUIRED. THE #1 LEADING FACTOR WAS THAT THIS PLT WAS NOT GIVEN A CHANCE FOR A FULL DEMO SO COCKPIT FAMILIARIZATION WAS AT A LOWER THAN NORMAL LEVEL. TO PREVENT REOCCURRENCE I WILL NOT BE TALKED INTO A NON STANDARD DEMO IN THE FUTURE.

Data retrieved from NASA's ASRS site as of January 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.