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Air carrier does not intercept ILS because he has not received clearance. ATC is suspected to have issued the clearance using the call sign of another aircraft.
| Attributes | |
| ACN | 476960 |
| Time | |
| Date | 200006 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : iah.airport |
| State Reference | TX |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Brasilia EMB-120 All Series |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Navigation In Use | ils localizer & glide slope : 26 |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision arrival : on vectors |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 200 flight time total : 2200 flight time type : 240 |
| ASRS Report | 476960 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Events | |
| Anomaly | non adherence : published procedure |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
We were being vectored for the ILS runway 26 approach into iah. The ATC controller said he assigned us a heading and told us to join the runway 26 localizer. My first officer and I never heard him issue this clearance. As a result, we flew through the runway 26 localizer on the previously assigned heading. To my knowledge we did not cause any traffic conflicts. The controller then issued a new heading and we joined the runway 26 localizer. We believed the problem resulted because the aircraft ahead of us had a call sign that was almost identical to ours. We heard the controller issue an approach clearance to the aircraft ahead of us twice, but never to us. My first officer and I believed the controller erred when he attempted to clear us for the approach by using the other aircraft's call sign. The approach controller never warned us that there was an aircraft with a similar sounding call sign on our same frequency.
Original NASA ASRS Text
Title: ACR DOES NOT INTERCEPT ILS BECAUSE HE HAS NOT RECEIVED CLRNC. ATC IS SUSPECTED TO HAVE ISSUED THE CLRNC USING THE CALL SIGN OF ANOTHER ACFT.
Narrative: WE WERE BEING VECTORED FOR THE ILS RWY 26 APCH INTO IAH. THE ATC CTLR SAID HE ASSIGNED US A HDG AND TOLD US TO JOIN THE RWY 26 LOC. MY FO AND I NEVER HEARD HIM ISSUE THIS CLRNC. AS A RESULT, WE FLEW THROUGH THE RWY 26 LOC ON THE PREVIOUSLY ASSIGNED HDG. TO MY KNOWLEDGE WE DID NOT CAUSE ANY TFC CONFLICTS. THE CTLR THEN ISSUED A NEW HDG AND WE JOINED THE RWY 26 LOC. WE BELIEVED THE PROB RESULTED BECAUSE THE ACFT AHEAD OF US HAD A CALL SIGN THAT WAS ALMOST IDENTICAL TO OURS. WE HEARD THE CTLR ISSUE AN APCH CLRNC TO THE ACFT AHEAD OF US TWICE, BUT NEVER TO US. MY FO AND I BELIEVED THE CTLR ERRED WHEN HE ATTEMPTED TO CLR US FOR THE APCH BY USING THE OTHER ACFT'S CALL SIGN. THE APCH CTLR NEVER WARNED US THAT THERE WAS AN ACFT WITH A SIMILAR SOUNDING CALL SIGN ON OUR SAME FREQ.
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.