Global Express (BD700)
Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 50; Flight Crew Total 3300; Flight Crew Type 700
Confusion; Situational Awareness; Workload; Human-Machine Interface
Aircraft Equipment Problem Less Severe; Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert; Flight Crew Returned To Clearance; Flight Crew Became Reoriented
Aircraft; Human Factors
On the JAIKE 3 RNAV arrival into TEB; we were told to cross JAIKE at 13;000 FT as depicted on the STAR. Left our assigned altitude of FL190; inputted direct to the 13;000 FT on the FMS and set VNAV to allow the autopilot to descend. 4 miles from JAIKE; we noticed we were still high (about 2;000 FT) and then increased our descent rate to make the crossing restricting. Approximately one mile later our FMS sequenced to the next waypoint ILENE and then the Controller asked to increase our descent rate which I acknowledge. Soon after; the Controller handed us off to the next sector. Careful watch over the FMS computer would have prevented us from having to hurry up and increase our rate of descent. The computer calculations from the FMS were off and it would have had us approximately 1;000 FT high at the location of JAIKE if we didn't turn off VNAV and go into VS. The Controller may have seen we were not going to cross at 13;000 FT and that is why they asked us to increase our rate of descent.
The reporter stated that his aircraft has the Honeywell Primus 2000 FMS. The FMS was properly programmed and flying the profile correctly until approaching JAIKE. During that phase of flight the aircraft was slowing to 250 KTS and was apparently intending to comply with the ILENE constraint; but not the JAIKE constraint. The Reporter confirmed; when asked about the behavior; that he had seen the FMS fly other arrivals and also disregard same altitude constraints which were closely spaced but he had not realized that the behavior was repeating in such a predictable manner.
A BD-700's Honeywell Primus 2000 FMS missed the TEB JAIKE 13;000 FT constraint as the aircraft slowed to 250 KTS and was apparently descending and slowing so as to comply with ILENE; the next 13;000 FT constraint.