ZFW CTLR DESCRIBED URET FAILURE TO PROVIDE ACCURATE CTLR ROUTING INFO TO IAH AND HOU DURING MULTIPLE WX DEVIATION PROCS.

Date: 2008-05

Anomalies: other-wx-routing-and-uret-anomaly

Synopsis

ZFW CTLR DESCRIBED URET FAILURE TO PROVIDE ACCURATE CTLR ROUTING INFO TO IAH AND HOU DURING MULTIPLE WX DEVIATION PROCS.

Narrative

HVY WX WAS BLOCKING THE NORMAL ARR RTE INTO THE HOUSTON TERMINAL AREA FROM THE NW. ACFT FROM THE DFW TERMINAL AREA WERE BEING REROUTED OVER SAN ANTONIO INTO IAH AND HOU FOR WX AVOIDANCE. THE COORD RTE THAT WAS TO BE ISSUED FOR THESE ACFT WAS 'ACT..SAT.GLAND3.IAH' OR 'ACT..SAT.LISSE6.HOU;' HOWEVER; ACFT FROM THE DFW TERMINAL AREA WERE BEING ISSUED 'NELYN.NELYN2.SAT.GLAND3.HOU' AND 'NELYN.JPOOL3.SAT.LISSE6.HOU.' WE POINTED THIS OUT AND WERE TOLD IT WAS ACCEPTABLE. NOTES: BOTH THE NELYN2 AND JPOOL3 OVERFLY ACT AND THEN OFFSET SLIGHTLY E OF DIRECT SAT. ACT..SAT IS THE ACT 198 DEG RADIAL AND THE SAT 017 DEG RADIAL. ACT.NELYN2.SAT IS THE ACT 196 DEG RADIAL AND THE SAT 027 DEG RADIAL. ACT.JPOOL3.SAT IS THE ACT 193 DEG RADIAL AND THE SAT 024 DEG RADIAL. THE RESULT OF THIS IS ABOUT AN 8 MI OFFSET AT THE MAX DIVERGENCE POINT (THE HOARY INTXN). THEN ACFT STARTED DEPARTING AND THE URET SYS SHOWED THEM CLRED VIA EITHER THE NELYN2 OR JPOOL3 TO SAT; HOWEVER; IT ALSO SHOWED A RERTE TO BE ISSUED. THE REQUIRED RERTE WAS EITHER 'ACT..SAT.GLAND3' OR 'ACT..SAT.LISSE6.' HOWEVER; IF THIS RERTE WAS ACKNOWLEDGED IN URET; THE SYS SHOWED THE RTE AS IT WAS BEFORE (THE NELYN OR JPOOL DEP). WHAT THIS MEANS IS THAT ANYONE ISSUING THE RERTE THE SYS CALLED AND THEN ACKNOWLEDGING THE ISSUANCE WOULD CAUSE THE ACFT TO FLY A RTE W OF THAT THE URET AND NAS SYS SHOWED IT CLRED TO FLY. IN THE CASE OF THE WACO LOW SECTOR; THIS MIGHT CAUSE AN OPDEV. THE RTE 'ACT..SAT' CAUSES THE ACFT TO GET WITHIN 3 OR SO MI OF THE BOUNDARY WITH STONEWALL LOW; WHERE THE SHOWN RTE (THE NELYN OR JPOOL DEP) WOULD KEEP THE FLT OVER 7 MI CLR. GIVEN THE POSSIBILITY OF A FLT TRACKING L OR R OF COURSE; AN OPDEV IS VERY LIKELY IF THE CTLR DIDN'T NOTICE THE ACFT STRAYING AND IF THE ACFT WAS NOTICED 'OFF COURSE;' A PLT MIGHT BE ACCUSED OF A PLTDEV FOR FOLLOWING A CLRNC THAT THE SYS SAYS THEY DIDN'T GET.

Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.