|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||atc facility : den|
|Altitude||agl bound lower : 0|
agl bound upper : 0
|Affiliation||government : faa|
|Qualification||controller : non radar|
pilot : instrument
|Experience||controller non radar : 3|
flight time total : 2000
|Anomaly||other anomaly other|
|Independent Detector||other controllera|
|Primary Problem||ATC Human Performance|
|Air Traffic Incident||other|
|ATC Facility||procedure or policy : unspecified|
At denver international the ATCT and TRACON have adopted a LOA authorizing converging simultaneous ILS approachs to various runway configns. Per the LOA these approachs are authority/authorized if the official WX is reported as at least 1000 ft AGL and 3 mi visibility (basic VFR). The problem is that the missed approach procedures in several of the configns conflict in such a manner that if one of the aircraft execute the published missed approach procedure, it will put the aircraft opposite direction to aircraft flying the other ILS approach. Since FARS and air traffic regulations authority/authorized an aircraft to fly the published missed approach and loss of communication is always a possibility how can this procedure be deemed safe and legal. I have not been able to find anything that would legally authority/authorized this in the FAA 7110.65. When I brought my concerns to the facility management they told me that a lack of anything in the FAA 7110.65 saying simultaneous converging ILS approachs are not illegal, must mean its legal. At a facility where we are authority/authorized simultaneous ILS approachs to 3 runways which are a safe published procedure, it appears unsafe and not prudent to allow the above mentioned procedures.
Original NASA ASRS Text
Title: RPTR AT DEN IS CONCERNED THAT A NEW LOA EXPLAINING PROCS FOR ILS APCHS IS NOT LEGAL OR SAFE.
Narrative: AT DENVER INTL THE ATCT AND TRACON HAVE ADOPTED A LOA AUTHORIZING CONVERGING SIMULTANEOUS ILS APCHS TO VARIOUS RWY CONFIGNS. PER THE LOA THESE APCHS ARE AUTH IF THE OFFICIAL WX IS RPTED AS AT LEAST 1000 FT AGL AND 3 MI VISIBILITY (BASIC VFR). THE PROB IS THAT THE MISSED APCH PROCS IN SEVERAL OF THE CONFIGNS CONFLICT IN SUCH A MANNER THAT IF ONE OF THE ACFT EXECUTE THE PUBLISHED MISSED APCH PROC, IT WILL PUT THE ACFT OPPOSITE DIRECTION TO ACFT FLYING THE OTHER ILS APCH. SINCE FARS AND AIR TFC REGS AUTH AN ACFT TO FLY THE PUBLISHED MISSED APCH AND LOSS OF COM IS ALWAYS A POSSIBILITY HOW CAN THIS PROC BE DEEMED SAFE AND LEGAL. I HAVE NOT BEEN ABLE TO FIND ANYTHING THAT WOULD LEGALLY AUTH THIS IN THE FAA 7110.65. WHEN I BROUGHT MY CONCERNS TO THE FACILITY MGMNT THEY TOLD ME THAT A LACK OF ANYTHING IN THE FAA 7110.65 SAYING SIMULTANEOUS CONVERGING ILS APCHS ARE NOT ILLEGAL, MUST MEAN ITS LEGAL. AT A FACILITY WHERE WE ARE AUTH SIMULTANEOUS ILS APCHS TO 3 RWYS WHICH ARE A SAFE PUBLISHED PROC, IT APPEARS UNSAFE AND NOT PRUDENT TO ALLOW THE ABOVE MENTIONED PROCS.
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.