Narrative:

We were to depart from teb airport with instruction by clearance delivery to fly teb 5 departure as the initial departure procedure. Before taking the active runway captain PF and first officer PNF did accomplish all necessary requirements on the checklist prior to 'position and hold' on runway 24. This includes all systems departure checks; departure cross-checks; departure navigation/communication frequencies programmed on RMU1; RMU2 as well as the flight plan programmed in UNS1 and UNS2. Both pfd HSI's were selected to its own FMS. On the mfd; altitude select was set for 1500 ft to follow teb 5 departure. Heading was selected for the flight director and bugged for runway heading. On departure; standard SOP call-outs were adequately performed. At approximately 1100 ft the autoplt was engaged and the airplane was flying runway heading climbing at a rate of approximately 3000 ft per minute with the use of vertical speed select button. The autoplt was coupled and programmed to level off at the pre-select altitude of 1500 ft; but unfortunately it did not capture and continued to climb through 1500 ft. My attention was momentarily divided as I executed the published right turn to the 280 degree heading. Immediately after realizing the level off failed; I took action to lower the nose and regain an altitude to 1500 ft. At this time ATC advised of this fault and instructed us to climb to 6000 ft. As we started to climb again; ATC instructed to continue right turn to heading 090 degrees. Following ATC vectors; ATC instructed the crew to call once on the ground. On the concluding post-flight briefing; certain measures and specific CRM improvements could have prevented the altitude loss on this teb departure. Since; we have retrained how we brief pre-takeoff to ensure more accurate monitoring of aircraft performance. My research has indicated that there are many similar cases with complaints that honeywell primus 1000 system will not always process an altitude capture if capture mode is selected with less than 1000 ft from altitude preselect. I thing it should be considered to issue a warning bulletin to crews operating this system to exercise close monitoring under these conditions.

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Original NASA ASRS Text

Title: A CE560XL DEPARTING TEB ON THE TEB DEP FAILED TO LEVEL AT 1500 FT. ATC PROVIDED A NEW CLRNC.

Narrative: WE WERE TO DEPART FROM TEB ARPT WITH INSTRUCTION BY CLRNC DELIVERY TO FLY TEB 5 DEP AS THE INITIAL DEP PROC. BEFORE TAKING THE ACTIVE RWY CAPT PF AND FO PNF DID ACCOMPLISH ALL NECESSARY REQUIREMENTS ON THE CHKLIST PRIOR TO 'POSITION AND HOLD' ON RWY 24. THIS INCLUDES ALL SYSTEMS DEP CHKS; DEP CROSS-CHKS; DEP NAV/COM FREQUENCIES PROGRAMMED ON RMU1; RMU2 AS WELL AS THE FLT PLAN PROGRAMMED IN UNS1 AND UNS2. BOTH PFD HSI'S WERE SELECTED TO ITS OWN FMS. ON THE MFD; ALT SELECT WAS SET FOR 1500 FT TO FOLLOW TEB 5 DEP. HEADING WAS SELECTED FOR THE FLT DIRECTOR AND BUGGED FOR RWY HEADING. ON DEP; STANDARD SOP CALL-OUTS WERE ADEQUATELY PERFORMED. AT APPROX 1100 FT THE AUTOPLT WAS ENGAGED AND THE AIRPLANE WAS FLYING RWY HEADING CLBING AT A RATE OF APPROX 3000 FT PER MINUTE WITH THE USE OF VERTICAL SPEED SELECT BUTTON. THE AUTOPLT WAS COUPLED AND PROGRAMMED TO LEVEL OFF AT THE PRE-SELECT ALT OF 1500 FT; BUT UNFORTUNATELY IT DID NOT CAPTURE AND CONTINUED TO CLB THROUGH 1500 FT. MY ATTENTION WAS MOMENTARILY DIVIDED AS I EXECUTED THE PUBLISHED R TURN TO THE 280 DEG HEADING. IMMEDIATELY AFTER REALIZING THE LEVEL OFF FAILED; I TOOK ACTION TO LOWER THE NOSE AND REGAIN AN ALT TO 1500 FT. AT THIS TIME ATC ADVISED OF THIS FAULT AND INSTRUCTED US TO CLB TO 6000 FT. AS WE STARTED TO CLB AGAIN; ATC INSTRUCTED TO CONTINUE R TURN TO HEADING 090 DEGS. FOLLOWING ATC VECTORS; ATC INSTRUCTED THE CREW TO CALL ONCE ON THE GND. ON THE CONCLUDING POST-FLT BRIEFING; CERTAIN MEASURES AND SPECIFIC CRM IMPROVEMENTS COULD HAVE PREVENTED THE ALT LOSS ON THIS TEB DEP. SINCE; WE HAVE RETRAINED HOW WE BRIEF PRE-TAKEOFF TO ENSURE MORE ACCURATE MONITORING OF ACFT PERFORMANCE. MY RESEARCH HAS INDICATED THAT THERE ARE MANY SIMILAR CASES WITH COMPLAINTS THAT HONEYWELL PRIMUS 1000 SYSTEM WILL NOT ALWAYS PROCESS AN ALT CAPTURE IF CAPTURE MODE IS SELECTED WITH LESS THAN 1000 FT FROM ALT PRESELECT. I THING IT SHOULD BE CONSIDERED TO ISSUE A WARNING BULLETIN TO CREWS OPERATING THIS SYSTEM TO EXERCISE CLOSE MONITORING UNDER THESE CONDITIONS.

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.