HS 125 Series
Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Multiengine
Flight Crew Last 90 Days 35; Flight Crew Total 10000; Flight Crew Type 6000
Situational Awareness; Distraction; Confusion; Communication Breakdown; Human-Machine Interface
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance; Flight Crew Returned To Clearance
Chart Or Publication; Human Factors
I was the captain flying and departing TEB. Our clearance was the RUUDY5 departure GAYEL transition; etc... I had to manually program our FMS-GNSXLS- for WENTZ @1500 feet; TASCA @2000 feet and RUUDY intersections; and then the GAYEL transition. When we departed RWY 24 @ TEB; I was in heading mode to intercept the 260 degree course to WENTZ. I switched to NAV to track to WENTZ and cross @ 1500 feet. Crossing WENTZ; I switched back to heading mode to track 280 degree to TASCA to cross @ 2000 feet. We were cleared to climb to 10;000 feet. The PNF then switched back to Navigation (NAV) mode after crossing TASCA. Because the FMS had been programmed for the GAYEL transition; the autopilot turned north to GAYEL before crossing RUUDY because it is a 90 degree turn. We should have been back in heading mode and departed RUUDY on a 280 degree heading until vectors to GAYEL. ATC stated; 'XXX; I don't know where you are going but you should be heading 280 degrees'. We turned to 280 degrees and climbed to 10;000 feet. There was no conflict with other aircraft.After talking to the Pilot Not Flying (PNF) and the other pilots in our flight department; we have decided to not accept this departure (RUUDY5) because of the age of our FMS; the switching of modes 3 times in 8 miles while climbing; cleaning up of the aircraft; running checklist; avoiding traffic; and abiding by the noise abatement procedure for RWY24 at TEB.
The flight crew of an HS125 attempted to fly the RUUDY SID from TEB using a rapid reprogramming of heading and navigation modes in order to comply with the charted heading and fix to fix routing involved. Unfortunately; due to the aged minimalism of their FMS capability; the programming after TASCA was incorrect and the jet turned direct to GAYEL via a heading of 280 degrees after RUUDY as charted. Departure control caught the error and corrected their track.