Narrative:

Nottingham five arrival, baltimore-washington international. When proceeding inbound to deale intersection, with clearance to cross deale at 6000 ft and aircraft equipped with FMS, the FMS will not advance to ravnn, nor will it start to program a turn to intercept the ravnn to ripkn leg, until the aircraft passes over deale. Since the distance from deale to ravnn is only 1 mi, the aircraft will overshoot the ravnn to ripkn leg by 2-3 mi. This could cause a conflict with other aircraft arriving from the east or aircraft on final to runway 33L. Deale should be at least 3 mi from ravnn in order for FMS to program a turn that will properly intercept the ravnn-ripkn. Another solution would be to eliminate deale altogether and publish a crossing altitude at ravnn. Callback conversation with reporter revealed the following information: reporter advised that 1 mi is insufficient mileage for the FMS to initially recognize the approaching intersection, recognize that the intersection has been crossed, look forward for the next intersection, and adjust to what is programmed next, much less anticipate a more than 90 degree turn. Reporter is submitting, through company, a recommendation to ask pct to amend the STAR, specifically to eliminate deale intersection.

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Original NASA ASRS Text

Title: B717 FLT CREW OVERSHOOT RAVNN INTXN ON NOTTINGHAM (OTT) STAR INTO BWI. PLT CLAIMS INSUFFICIENT TIME FOR FMS RECOGNITION BTWN DEALE AND RAVNN INTXNS TO EXECUTE TURN TO FINAL.

Narrative: NOTTINGHAM FIVE ARR, BALTIMORE-WASHINGTON INTL. WHEN PROCEEDING INBOUND TO DEALE INTXN, WITH CLRNC TO CROSS DEALE AT 6000 FT AND ACFT EQUIPPED WITH FMS, THE FMS WILL NOT ADVANCE TO RAVNN, NOR WILL IT START TO PROGRAM A TURN TO INTERCEPT THE RAVNN TO RIPKN LEG, UNTIL THE ACFT PASSES OVER DEALE. SINCE THE DISTANCE FROM DEALE TO RAVNN IS ONLY 1 MI, THE ACFT WILL OVERSHOOT THE RAVNN TO RIPKN LEG BY 2-3 MI. THIS COULD CAUSE A CONFLICT WITH OTHER ACFT ARRIVING FROM THE E OR ACFT ON FINAL TO RWY 33L. DEALE SHOULD BE AT LEAST 3 MI FROM RAVNN IN ORDER FOR FMS TO PROGRAM A TURN THAT WILL PROPERLY INTERCEPT THE RAVNN-RIPKN. ANOTHER SOLUTION WOULD BE TO ELIMINATE DEALE ALTOGETHER AND PUBLISH A XING ALT AT RAVNN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED THAT 1 MI IS INSUFFICIENT MILEAGE FOR THE FMS TO INITIALLY RECOGNIZE THE APCHING INTXN, RECOGNIZE THAT THE INTXN HAS BEEN CROSSED, LOOK FORWARD FOR THE NEXT INTXN, AND ADJUST TO WHAT IS PROGRAMMED NEXT, MUCH LESS ANTICIPATE A MORE THAN 90 DEG TURN. RPTR IS SUBMITTING, THROUGH COMPANY, A RECOMMENDATION TO ASK PCT TO AMEND THE STAR, SPECIFICALLY TO ELIMINATE DEALE INTXN.

Data retrieved from NASA's ASRS site as of July 2007 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.