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Deviation from clearance route -- the reporter's air carrier aircraft wandered off the localizer while the flight crew watched another air carrier on the parallel approach.
| Attributes | |
| ACN | 308840 |
| Time | |
| Date | 199505 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : den |
| State Reference | CO |
| Altitude | msl bound lower : 11000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : den |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach descent other landing other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach descent other landing other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 80 flight time total : 2200 flight time type : 80 |
| ASRS Report | 308840 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 2000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While intercepting the ILS runway 35L to denver, crew sighted an air carrier 727 below and to the right presumably intercepting ILS runway 35R. As aircraft was not called by approach as traffic, pilots attempted to maintain visual separation. During descent on GS ATC restr our aircraft to 10000 ft for traffic. At this point, we noticed a deviation of our aircraft from the localizer. This was immediately corrected and traffic was called in sight. In an attempt to maintain visual contact with traffic which was unannounced by ATC, we made a deviation which was not deliberate. ATC could help by advising us of traffic and informing of simultaneous or parallel ILS (other than just ATIS).
Original NASA ASRS Text
Title: DEV FROM CLRNC RTE -- THE RPTR'S ACR ACFT WANDERED OFF THE LOC WHILE THE FLC WATCHED ANOTHER ACR ON THE PARALLEL APCH.
Narrative: WHILE INTERCEPTING THE ILS RWY 35L TO DENVER, CREW SIGHTED AN ACR 727 BELOW AND TO THE R PRESUMABLY INTERCEPTING ILS RWY 35R. AS ACFT WAS NOT CALLED BY APCH AS TFC, PLTS ATTEMPTED TO MAINTAIN VISUAL SEPARATION. DURING DSCNT ON GS ATC RESTR OUR ACFT TO 10000 FT FOR TFC. AT THIS POINT, WE NOTICED A DEV OF OUR ACFT FROM THE LOC. THIS WAS IMMEDIATELY CORRECTED AND TFC WAS CALLED IN SIGHT. IN AN ATTEMPT TO MAINTAIN VISUAL CONTACT WITH TFC WHICH WAS UNANNOUNCED BY ATC, WE MADE A DEV WHICH WAS NOT DELIBERATE. ATC COULD HELP BY ADVISING US OF TFC AND INFORMING OF SIMULTANEOUS OR PARALLEL ILS (OTHER THAN JUST ATIS).
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.