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ZAU controllers described a albatros with a failed mode-C which then resulted in an unplanned landing.
| Attributes | |
| ACN | 908021 |
| Time | |
| Date | 201009 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZAU.ARTCC |
| State Reference | IL |
| Aircraft 1 | |
| Make Model Name | Albatros (L39) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Climb |
| Person 1 | |
| Qualification | Air Traffic Control Fully Certified |
| Person 2 | |
| Qualification | Air Traffic Control Developmental |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude |
Narrative:
An albatros checked on climbing from FL250 to FL270. However; his mode-C showed him leaving FL230. I ask him to verify altitude leaving. He again said FL250. I told him that his mode-C showed him leaving FL230. He said he would check his equipment. He then said that he had found the problem and that he was leaving FL230 as his mode-C was showing. I told him to report leaving FL250. He did. I descended an air carrier to FL240 to get under the albatros. When the air carrier was level FL240 and handed off to the bearz sector; I switched communication to bearz with the air carrier. A short time later; the albatros said that he was not sure of his altitude. I immediately call traffic on the air carrier who was passing south of the albatros. The albatros reported the air carrierin sight and that the albatros was above him. I told the albatros to maintain FL250. He said that he was either at FL255 or FL265 descending to FL250; and that he wanted to land. I cleared the albatros to an airport.
Original NASA ASRS Text
Title: ZAU Controllers described a Albatros with a failed Mode-C which then resulted in an unplanned landing.
Narrative: An Albatros checked on Climbing from FL250 to FL270. However; his Mode-C showed him leaving FL230. I ask him to verify altitude leaving. He again said FL250. I told him that his Mode-C showed him leaving FL230. He said he would check his equipment. He then said that he had found the problem and that he was leaving FL230 as his Mode-C was showing. I told him to report leaving FL250. He did. I descended an air carrier to FL240 to get under the Albatros. When the air carrier was level FL240 and handed off to the BEARZ Sector; I switched communication to BEARZ with the air carrier. A short time later; the Albatros said that he was not sure of his altitude. I immediately call traffic on the air carrier who was passing south of the Albatros. The Albatros reported the air carrierin sight and that the Albatros was above him. I told the Albatros to maintain FL250. He said that he was either at FL255 or FL265 descending to FL250; and that he wanted to land. I cleared the Albatros to an airport.
Data retrieved from NASA's ASRS site as of April 2012 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.