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Flight crew of medium large transport making ILS approach to mdw airport runway 31 had ILS identifier overwhelmed by identifier for ILS 13.
| Attributes | |
| ACN | 194483 |
| Time | |
| Date | 199110 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mdw |
| State Reference | IL |
| Altitude | msl bound lower : 5000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent : approach |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 9000 flight time type : 5000 |
| ASRS Report | 194483 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
IMC, IFR approach to runway 31C (ILS) chicago midway airport, copilot flying, captain tuning and identing the radios and approach aids. Captain hears imdw morse code for the localizer to runway 13C - - it was very strong and loud. I questioned the controller and got no answer as to why the wrong identifier was being broadcast. Due to IMC conditions and lack of a VOR DME at midway airport to back up the localizer information, I became concerned and finally (at about the kedzi marker) heard (very faintly) the imxt morse code identifier. I realize that 109.9 is the common localizer for both runways, but when 31C is in use, I thought 13C would be turned off, or at least the aural identifier would be off. This occurred starting about 20 NM southwest of mdw and continued all the way around to the OM near jot for 31C. Very disconcerting when IMC with low ceilings/low visibility approachs.
Original NASA ASRS Text
Title: FLC OF MLG MAKING ILS APCH TO MDW ARPT RWY 31 HAD ILS IDENTIFIER OVERWHELMED BY IDENTIFIER FOR ILS 13.
Narrative: IMC, IFR APCH TO RWY 31C (ILS) CHICAGO MIDWAY ARPT, COPLT FLYING, CAPTAIN TUNING AND IDENTING THE RADIOS AND APCH AIDS. CAPT HEARS IMDW MORSE CODE FOR THE LOC TO RWY 13C - - IT WAS VERY STRONG AND LOUD. I QUESTIONED THE CTLR AND GOT NO ANSWER AS TO WHY THE WRONG IDENTIFIER WAS BEING BROADCAST. DUE TO IMC CONDITIONS AND LACK OF A VOR DME AT MIDWAY ARPT TO BACK UP THE LOC INFO, I BECAME CONCERNED AND FINALLY (AT ABOUT THE KEDZI MARKER) HEARD (VERY FAINTLY) THE IMXT MORSE CODE IDENTIFIER. I REALIZE THAT 109.9 IS THE COMMON LOC FOR BOTH RWYS, BUT WHEN 31C IS IN USE, I THOUGHT 13C WOULD BE TURNED OFF, OR AT LEAST THE AURAL IDENTIFIER WOULD BE OFF. THIS OCCURRED STARTING ABOUT 20 NM SW OF MDW AND CONTINUED ALL THE WAY AROUND TO THE OM NEAR JOT FOR 31C. VERY DISCONCERTING WHEN IMC WITH LOW CEILINGS/LOW VISIBILITY APCHS.
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.