ACFT EQUIP PROB. AN ERRONEOUS WAYPOINT HAD BEEN INSERTED INTO THE FMS BY A PREVIOUS FLC; BUT WHEN THE RPTR FLC CALLED UP THE WAYPOINT; THERE WAS NO DISTINCTION BTWN DATABASE INFO OR FLC INSERTED INFO. CTLR HAD ASSIGNED A XING ALT RESTR AND REPEATEDLY ASKED FLC IF THEY WOULD MAKE IT. SINCE THE WAYPOINT FIX TO WHICH THEY WERE GOING WAS IN ERROR; THEY WERE MISLED AND WERE 50 MI OFF ON THE FIX XING.

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I AM A DA90/50 INSTRUCTOR PLT/EXAMINER; AND I AM APPALLED BY MY FINDINGS IN THIS INCIDENT IN WHICH I WAS A DEADHEADING PLT ON THE JUMPSEAT HAVING BEEN RELIEVED AS CAPT HALF WAY ENRTE. WHAT APPALLS ME IS THAT I AM ALSO A INSTRUCTOR AT THE TRAINING CTR; HAD NO RECOLLECTION OF KNOWING THE REASONING BEHIND THE 'TRAP' BUILT INTO THE HONEYWELL SYS; CALLED OUR RESIDENT EXPERT AVIONICS INSTRUCTOR IMMEDIATELY AFTERWARDS AND WAS SHOCKED TO LEARN THIS WAS NOT ONLY A 'TRAP' TO WHICH HONEYWELL AND DASSAULT FALCON JET ARE AWARE; BUT THAT THEIR BLATANT DISREGARD FOR SAFETY AND SENSIBILITY IS INCREDIBLE WHEN I LEARNED THAT OUR INSTRUCTORS HAVE BEEN ARGUING AGAINST THIS BUILT-IN TRAP FOR 9 YRS TO NO AVAIL. I HAVE ABOUT 4000 HRS IN THE FALCON900; OF WHICH ABOUT 1000 HRS PLUS ARE IN THE ACFT. THE INCIDENT: WE WERE SWBOUND IN ZZZ AIRSPACE APPROX 100 NM NE OF AABB INTXN; ON RADAR VECTORS WITH A SUBSEQUENT CLRNC 'RNAV DIRECT AABB' WITH A DSCNT CLRNC TO 'CROSS AABB AT FL240.' WE WERE IN A SLOW DSCNT ON VNAV OUT OF ABOUT FL350 DSNDING WHEN I WAS ALERTED FROM A 'CATNAP' ON THE JUMPSEAT TO WHAT APPEARED TO ME TO BE A DISTRESSFUL CALL FROM ATC QUESTIONING OUR VERT SPD AND WHETHER WE WOULD MAKE THE XING RESTR. AS THE CAPT FLYING REPLIED TO ATC I OBSERVED BOTH PLTS NAVING ON FMS WITH ABOUT 106 MI DISPLAYED ON THE MULTI-FUNCTION DISPLAY WHICH WAS IN MY CLR VIEW; SHOWING THE ACFT NAVING DIRECT TO AABB. THE CAPT HAD REPLIED THERE WOULD BE NO PROB MAKING THE RESTR. APPROX 20 MI FARTHER; ON AN OFF-AIRWAY RNAV DIRECT RTE AND DSNDING THROUGH WHAT I RECOLLECT TO BE FL320; THE SAME CTLR CAME ON THE RADIO IN A RATHER ANGRY ATTITUDE ASKING IF WE WERE REALLY GOING TO MAKE THE XING RESTR; AND TO INCREASE THE DSCNT RATE. THE CAPT INFORMED HIM WE WOULD MAKE THE RESTR AND THAT WE SHOWED APPROX 80 NM TO GO. THE CTLR DID NOT REPLY. A CONVERSATION TOOK PLACE IN THE COCKPIT AS TO WHETHER THE FMS WAS WRONG OR WHETHER THE CTLR HAD US CONFUSED WITH ANOTHER ACFT; OR 'WHAT HIS PROB WAS.' THE PF'S VERIFIED ALL 3 FMS SYS IN ACCEPTABLE AGREEMENT. WE DID NOT HAVE TIME TO VERIFY AABB BY THE FMS PROC OF PLACE-BEARING-DISTANCE; AND LATITUDE LONGITUDE IS NOT DISPLAYED ON THE CHART. THE CTLR INTERRUPTED IN A VERY DISTURBED MANNER; INFORMING US WE MISSED THE RESTR BY ABOUT 8000 FT AND THAT WE WERE NOW S OF AABB; FURTHER INTRODUCING CONFUSION; AND CONCERN INTO THE COCKPIT AS WE SCRAMBLED TO SORT OUT THIS CONFLICTING DATA; AND NOW ATTEMPT TO FOLLOW NEW INSTRUCTIONS WITH TURNING VECTORS AND A BARRAGE OF VERBAL ABUSE FROM THE CTLR; I INFORMED THE CREW TO RPT A DUAL IRS NAV FAILURE AS THEY DID NOT AGREE WITH THE CTLR WHO LATER GAVE US OUR POS WHILE I DIRECTED THE CREW TO SWITCH TO VOR FOR THE REMAINDER OF THE TRIP. THE CAPT COULD NOT USE THE VOR AS WE WERE PROCEEDING TO A FIX NOT A VOR ON A DIRECT RNAV RTE WHEN THE 'APPARENT' FAILURE OCCURRED. THE TRIP PROCEEDED TO CONCLUSION WITHOUT FURTHER INCIDENT. DURING THE REMAINDER I TOOK READINGS FROM THE FMS AND THE GLOBAL NAV SYS WHICH WERE CONSISTENTLY 50 PLUS MI DIFFERENT; LOGGING THEM FOR A MAINT WRITE-UP. AT OUR DEST; THE FO DISCOVERED THE PROB. THE VERY DANGEROUS ERROR AND HIDDEN HONEYWELL 'TRAP.' WE ENTERED AABB MANUALLY AS IT WAS NOT DEFINED IN THE DATABASE. IN SO DOING; THE FO GAVE ME THE WRONG DISTANCE FOR PLACE-BEARING-DISTANCE; GIVING ME THE DISTANCE BTWN VOR'S INSTEAD OF THE MILEAGE BTWN VOR AND FIX. WHEN IT DID NOT LOOK RIGHT I CHKED THE CHART MYSELF AND POINTED OUT HIS ERROR TO HIM; AND PROCEEDED TO CORRECT THE DEFINED FIX ERROR. I WAS UNABLE TO CORRECT THE ERROR TO MY AMAZEMENT GETTING ERRORS 'FIX USED BY ACTIVE FLT PATH. NOT TO WORRY; I DELETED THE FIX FROM THE ACTIVE FLT PATH AND REENTERED IT; ONLY I FOUND I WAS UNABLE TO NOW DELETE AND CORRECT IT FOR REASONS UNDETERMINED; ABIDED BY THE AGE OLD ADAGE; 'FLY THE ACFT; AND FALL BACK TO RAW DATA WHEN THE FMS PROGRAMMING IS CONSUMING TOO MUCH DISTRACTING TIME IN BUSY AIRSPACE OR HIGH WORKLOAD PERIODS.' THE FLT WAS COMPLETED WITH NO PROBS; AND SINCE AABB WAS LONG PAST AT TRIPS END; IT WAS EQUALLY FORGOTTEN AFTER A LONG TIRING TRIP FROM YYY; AND AFTER A BUSY DSCNT IN CONGESTED AIRSPACE. WHEN WE CHKED WHAT THE FO REMEMBERED; SURE ENOUGH THE INCORRECT FIX WITH CORRECT PLACE-BEARING AND WRONG DISTANCE WAS STILL IN THE DATABASE; EXACTLY 50 PLUS MI TOO FAR FROM THE 'PLACE' VOR! THE HONEYWELL TRAP!!! THERE IS NO WAY HONEYWELL MAKES THE PLT AWARE THAT THE FIX HE CHOSE WAS MANMADE AND NOT FROM THE DATABASE! NOW LET'S ANALYZE THE FEATURES OF THE HONEYWELL FMS. WHEN ONE ENTERS SPD/ALT AS OPPOSED TO LETTING THE COMPUTER GENERATE THESE; THE SYS DISPLAYS THESE INPUTS AS LARGER POINT SIZE CHARACTERS; SIGNIFYING THAT SOMEONE; NOT THE COMPUTER ENTERED THESE FIGURES. WHEN ONE CREATES A FIX THAT IS NOT IN THE DATABASE; AN ASTERISK APPEARS NEXT TO THE NAME ON THE FLT PATH PAGE IN THE CURRENT ACTIVE FLT PATH ONLY. SUBSEQUENT SELECTION OF THE FIX BY NAME GIVES NO NOTIFICATION OF HOW THIS FIX WAS CREATED DATABASE OR PLT INPUT; NOTHING! NO ASTERISK. NO ENLARGED CHARACTER SIZE. NOTHING! IT WAS ALSO MY INCORRECT UNDERSTANDING THAT THE FIX WOULD DISAPPEAR FROM MEMORY AS DOES THE FLT PATH WHEN CREATED ON THE ACTIVE FLT PATH PAGE; SO THEREFORE I WAS NOT CONCERNED THAT I IGNORED THE ERROR AND COULD NOT CORRECT IT FOR WHATEVER REASON. THE SYS IN THE DA90 IS ADMITTEDLY DIFFERENT FROM THAT IN THE B757 ALTHOUGH THEY SHARE MANY SIMILARITIES. CONCLUSION AND IMMEDIATE PREVENTION SUGGESTIONS. PLTS: TRY TO KNOW AND REMEMBER ALL THE EQUIP LIMITATIONS. TRY TO REMEMBER TO CLR OUT ALL ERRONEOUS WAYPOINTS. THE PF THIS INCIDENT TRIP HAD NO IDEA THE FIX DID NOT COME FROM THE DATABASE; DIFFERENT PLT; DIFFERENT DAY. CLR OUT ALL WAYPOINTS IN THE 'FILES CLR' FUNCTION AS A MATTER OF HABIT. CHK ALL WAYPOINTS ALWAYS. THIS IS NOT ALWAYS POSSIBLE IN A HIGH WORKLOAD ENVIRONMENT; BUSY APCH/DSCNT; ESPECIALLY WITH CURRENT HONEYWELL DESIGN. BACKUP FMS WITH RAW DATA VOR/NDB ON THE PNF INSTS. THIS IS NOT ALWAYS POSSIBLE SUCH AS IN THE INCIDENT FLT AS WE WERE ON A 'VECTOR THEN AN RNAV DIRECT RTE TO A FIX; EVEN DIFFICULT IF DEFINED BY CROSS RADIALS; AND NOT A RECOMMENDED WAY TO NAV. INCREASE DSCNT RATE AND INVESTIGATE BACKUP NAV VERIFICATION IMMEDIATELY UPON ATC QUERY OF A NAV DISCREPANCY BTWN ACFT AND ATC. CTLRS: BETTER USE OF TERMINOLOGY AND QUERIES! A BETTER CHOICE OF WORDS MIGHT HAVE BEEN 'CONFIRM YOU POS 20 MI N OF ABC; WHICH I SHOW ON RADAR.' LONG TERM SUGGESTION: FORCE THE ARROGANT HONEYWELL/FALCON JET TO MODIFY THE EQUIP TO DISPLAY SOMETHING THAT WOULD KEY THE PLT IN TO THE FACT THAT THE FIX IS MAN-MADE AS SUGGESTED EARLIER IN THIS DOCUMENT BEFORE SOMEONE IS KILLED!