|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||airport : bwi.airport|
|Altitude||msl single value : 13000|
|Controlling Facilities||tracon : pct.tracon|
tower : zzz.tower
|Operator||common carrier : air carrier|
|Make Model Name||A320|
|Operating Under FAR Part||Part 121|
|Navigation In Use||other|
|Flight Phase||climbout : initial|
|Route In Use||departure sid : terpz|
|Affiliation||government : faa|
|Function||controller : departure|
|Qualification||controller : radar|
|Experience||controller radar : 15|
|Anomaly||other anomaly other|
|Independent Detector||other controllera|
|Resolutory Action||none taken : detected after the fact|
|ATC Facility||procedure or policy : pct.tracon|
Wonce waypoint on TERPZ1 departure procedure is charted as a fly-by waypoint. Wonce has a crossing restr of at or above 11000 ft. The vast majority of aircraft fly over wonce crossing it at or above 11000 ft climbing to 17000 ft (17000 ft climb is issued by ATC). Some aircraft fly by wonce instead of over it. I questioned the pilot why he wasn't flying over wonce like I expected and he stated that it was a fly-by waypoint. After researching it I find that the pilot is correct; wonce is not charted as a fly-over waypoint. Controllers base their control instructions on the expectation that aircraft will fly the terpz departure procedure flying over each point charted. I was never taught that the waypoints were fly-by and not fly-over. At a minimum; a temporary solution to ensure that aircraft are not climbed into aircraft flying the terps departure procedure is to advise controllers that all waypoints are fly-by and not fly-over. A permanent solution is to change the wonce waypoint to a fly-over waypoint so there is no guessing whether the aircraft will fly over or fly-by wonce and into the path of another aircraft.
Original NASA ASRS Text
Title: PCT CTLR EXPRESSED CONCERN REGARDING LACK OF CTLR BRIEFINGS/TRNG REF RNAV PROCS; I.E. FLY OVER VS. FLY BY RESTR.
Narrative: WONCE WAYPOINT ON TERPZ1 DEP PROC IS CHARTED AS A FLY-BY WAYPOINT. WONCE HAS A XING RESTR OF AT OR ABOVE 11000 FT. THE VAST MAJORITY OF ACFT FLY OVER WONCE XING IT AT OR ABOVE 11000 FT CLBING TO 17000 FT (17000 FT CLB IS ISSUED BY ATC). SOME ACFT FLY BY WONCE INSTEAD OF OVER IT. I QUESTIONED THE PLT WHY HE WASN'T FLYING OVER WONCE LIKE I EXPECTED AND HE STATED THAT IT WAS A FLY-BY WAYPOINT. AFTER RESEARCHING IT I FIND THAT THE PLT IS CORRECT; WONCE IS NOT CHARTED AS A FLY-OVER WAYPOINT. CTLRS BASE THEIR CTL INSTRUCTIONS ON THE EXPECTATION THAT ACFT WILL FLY THE TERPZ DEP PROC FLYING OVER EACH POINT CHARTED. I WAS NEVER TAUGHT THAT THE WAYPOINTS WERE FLY-BY AND NOT FLY-OVER. AT A MINIMUM; A TEMPORARY SOLUTION TO ENSURE THAT ACFT ARE NOT CLBED INTO ACFT FLYING THE TERPS DEP PROC IS TO ADVISE CTLRS THAT ALL WAYPOINTS ARE FLY-BY AND NOT FLY-OVER. A PERMANENT SOLUTION IS TO CHANGE THE WONCE WAYPOINT TO A FLY-OVER WAYPOINT SO THERE IS NO GUESSING WHETHER THE ACFT WILL FLY OVER OR FLY-BY WONCE AND INTO THE PATH OF ANOTHER ACFT.
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.