Narrative:

Departure runway 24 teb SID calls for 1500 ft altitude restr to 4.5 mi from teb VOR. Shortly after takeoff automatic pilot engaged in heading an VNAV. VNAV failed to capture 1500 ft and autoplt was disengaged and hand flown to not exceed a 2000 ft clearance altitude advised by departure control of our transgression and that no other aircraft were diverted; we acknowledged without further reference to the issue since we had already passed the 4.5 mi point and the frequency was very busy. Although we are currently discussing this issue with the manufacturer; this department will no longer utilize this feature of the automatic flight system for departures were altitude is restr close in; until we have a resolution; if there was indeed a failure and it has been corrected. Further; the automatic flight system is not foolproof and attention to its performance is always required.

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Original NASA ASRS Text

Title: A CL604 PLT RPTS THAT ON THE TEB SID THE FMC VNAV SYSTEM MALFUNCTIONED AND FAILED TO CAPTURE THE INITIAL 1500 FT ALT.

Narrative: DEP RWY 24 TEB SID CALLS FOR 1500 FT ALT RESTR TO 4.5 MI FROM TEB VOR. SHORTLY AFTER TKOF AUTO PLT ENGAGED IN HDG AN VNAV. VNAV FAILED TO CAPTURE 1500 FT AND AUTOPLT WAS DISENGAGED AND HAND FLOWN TO NOT EXCEED A 2000 FT CLRNC ALT ADVISED BY DEP CTL OF OUR TRANSGRESSION AND THAT NO OTHER ACFT WERE DIVERTED; WE ACKNOWLEDGED WITHOUT FURTHER REF TO THE ISSUE SINCE WE HAD ALREADY PASSED THE 4.5 MI POINT AND THE FREQUENCY WAS VERY BUSY. ALTHOUGH WE ARE CURRENTLY DISCUSSING THIS ISSUE WITH THE MANUFACTURER; THIS DEPT WILL NO LONGER UTILIZE THIS FEATURE OF THE AUTO FLT SYSTEM FOR DEPS WERE ALT IS RESTR CLOSE IN; UNTIL WE HAVE A RESOLUTION; IF THERE WAS INDEED A FAILURE AND IT HAS BEEN CORRECTED. FURTHER; THE AUTO FLT SYSTEM IS NOT FOOLPROOF AND ATTENTION TO ITS PERFORMANCE IS ALWAYS REQUIRED.

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.