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Flight crew of MD80 on ILS approach to runway 4R at ord divert from the localizer due to malfunctioning or incorrectly operated ILS receiver.
| Attributes | |
| ACN | 625973 |
| Time | |
| Date | 200407 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ord.airport |
| State Reference | IL |
| Altitude | msl single value : 3500 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 4l |
| Flight Phase | descent : intermediate altitude descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 625973 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure non adherence : company policies non adherence : clearance other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : ils/vor receiver other controllera |
| Resolutory Action | controller : issued advisory flight crew : regained aircraft control flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
Electromagnetic interference. This MD80 is different than other company MD80's when using the VHF navigation, especially for approach in the ILS mode. We were on approach for ILS runway 4R to ord and apparently got some sort of false lock on the localizer. It was tuned and idented. We were IMC at the time of intercept. Approach said we were left of course so we attempted to reset everything and reintercept the course. This is where the problem starts with this aircraft. This aircraft must have both ILS's tuned to the same frequency to intercept the glide path. At the same time on this approach, the PNF has to tune in ord VOR to know where you are for crossing points. This being the first time either of us had flown this confign we were a bit slow getting everything reset and on course. There were no conflicts but we were behind getting corrected to course.
Original NASA ASRS Text
Title: FLT CREW OF MD80 ON ILS APCH TO RWY 4R AT ORD DIVERT FROM THE LOC DUE TO MALFUNCTIONING OR INCORRECTLY OPERATED ILS RECEIVER.
Narrative: ELECTROMAGNETIC INTERFERENCE. THIS MD80 IS DIFFERENT THAN OTHER COMPANY MD80'S WHEN USING THE VHF NAV, ESPECIALLY FOR APCH IN THE ILS MODE. WE WERE ON APCH FOR ILS RWY 4R TO ORD AND APPARENTLY GOT SOME SORT OF FALSE LOCK ON THE LOC. IT WAS TUNED AND IDENTED. WE WERE IMC AT THE TIME OF INTERCEPT. APCH SAID WE WERE L OF COURSE SO WE ATTEMPTED TO RESET EVERYTHING AND REINTERCEPT THE COURSE. THIS IS WHERE THE PROB STARTS WITH THIS ACFT. THIS ACFT MUST HAVE BOTH ILS'S TUNED TO THE SAME FREQ TO INTERCEPT THE GLIDE PATH. AT THE SAME TIME ON THIS APCH, THE PNF HAS TO TUNE IN ORD VOR TO KNOW WHERE YOU ARE FOR XING POINTS. THIS BEING THE FIRST TIME EITHER OF US HAD FLOWN THIS CONFIGN WE WERE A BIT SLOW GETTING EVERYTHING RESET AND ON COURSE. THERE WERE NO CONFLICTS BUT WE WERE BEHIND GETTING CORRECTED TO COURSE.
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.