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ZAU controller and pilot reported the aircraft was at the wrong altitude due to an incorrect altimeter setting.
| Attributes | |
| ACN | 1422643 |
| Time | |
| Date | 201702 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZAU.ARTCC |
| State Reference | IL |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Light Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Altimeter |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 24 |
| Person 2 | |
| Function | Pilot Flying Single Pilot |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
Aircraft X checked on descending to 14000; and was issued the msn altimeter. Soon thereafter mke approach called up and said point out approved on aircraft X. At this time we noticed that aircraft X was at 13100 instead of his assigned 14000. We queried the pilot as to his altitude and he replied that he was level 140. We informed him that we showed him at 13100 and he said was descending to 13000 and requesting lower. We told him to maintain 13000 and that we'd have lower for him in a couple of miles. We then noticed that his altitude was varying between 12000 and 13000. When we issued 11000 and to switch to msn approach; we received no response for several minutes and several attempts by us and msn approach both. When he finally checked back on; we shipped aircraft X to msn approach. Upon further investigation and a call back from the pilot; it was discovered that the pilot had initially input the altimeter incorrectly as 30.43 instead of 29.43 causing his altitude to be 1000 feet off. Then the pilot tried to switch over to get the msn ATIS and we lost communications until he came back over.
Original NASA ASRS Text
Title: ZAU Controller and pilot reported the aircraft was at the wrong altitude due to an incorrect altimeter setting.
Narrative: Aircraft X checked on descending to 14000; and was issued the MSN altimeter. Soon thereafter MKE approach called up and said point out approved on Aircraft X. At this time we noticed that Aircraft X was at 13100 instead of his assigned 14000. We queried the pilot as to his altitude and he replied that he was level 140. We informed him that we showed him at 13100 and he said was descending to 13000 and requesting lower. We told him to maintain 13000 and that we'd have lower for him in a couple of miles. We then noticed that his altitude was varying between 12000 and 13000. When we issued 11000 and to switch to MSN approach; we received no response for several minutes and several attempts by us and MSN approach both. When he finally checked back on; we shipped Aircraft X to MSN approach. Upon further investigation and a call back from the pilot; it was discovered that the pilot had initially input the altimeter incorrectly as 30.43 instead of 29.43 causing his altitude to be 1000 feet off. Then the pilot tried to switch over to get the MSN ATIS and we lost communications until he came back over.
Data retrieved from NASA's ASRS site 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.