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A B757 flight crew have to manually realign the aircraft with the cun localizer runway 12 due to an erroneous signal.
| Attributes | |
| ACN | 625507 |
| Time | |
| Date | 200407 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mmun.airport |
| State Reference | FO |
| Altitude | msl single value : 2000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : mmun.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 12 other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 625507 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | other spatial deviation |
| Independent Detector | atc equipment other atc equipment : ils localizer other flight crewa |
| Resolutory Action | flight crew : overrode automation flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Navigational Facility |
| Primary Problem | Navigational Facility |
| Situations | |
| Navigational Aid | MMUN.ILS |
Narrative:
We were assigned a 155 degree heading to intercept the ILS 12 localizer at cun. The autoflt system was in heading select and the localizer armed. Prior to on course, the autoflt captured the localizer and began to turn to the inbound final heading of 122 degrees. We reprogrammed the autoflt to fly a 155 heading and noticed the localizer needle indications as being erratic. We verified the localizer as normal with approach control, and rechecked the identify and all AFDS programming. We maintained heading select until the localizer needle centered and then rearmed the ILS modes. Normal approach and landing. In the office I met another 757 captain and he indicated this was a routine occurrence in cun. I would recommend a caution message on cun flight plans or a note on the commercial chart pages indicating possible premature autoflt captures on this ILS.
Original NASA ASRS Text
Title: A B757 FLT CREW HAVE TO MANUALLY REALIGN THE ACFT WITH THE CUN LOC RWY 12 DUE TO AN ERRONEOUS SIGNAL.
Narrative: WE WERE ASSIGNED A 155 DEG HDG TO INTERCEPT THE ILS 12 LOC AT CUN. THE AUTOFLT SYSTEM WAS IN HDG SELECT AND THE LOC ARMED. PRIOR TO ON COURSE, THE AUTOFLT CAPTURED THE LOC AND BEGAN TO TURN TO THE INBND FINAL HDG OF 122 DEGS. WE REPROGRAMMED THE AUTOFLT TO FLY A 155 HDG AND NOTICED THE LOC NEEDLE INDICATIONS AS BEING ERRATIC. WE VERIFIED THE LOC AS NORMAL WITH APCH CTL, AND RECHECKED THE IDENT AND ALL AFDS PROGRAMMING. WE MAINTAINED HDG SELECT UNTIL THE LOC NEEDLE CENTERED AND THEN REARMED THE ILS MODES. NORMAL APCH AND LNDG. IN THE OFFICE I MET ANOTHER 757 CAPT AND HE INDICATED THIS WAS A ROUTINE OCCURRENCE IN CUN. I WOULD RECOMMEND A CAUTION MESSAGE ON CUN FLT PLANS OR A NOTE ON THE COMMERCIAL CHART PAGES INDICATING POSSIBLE PREMATURE AUTOFLT CAPTURES ON THIS ILS.
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.