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Due to wrong altimeter setting, less than standard separation occurred between an mlt and another aircraft at 16000'.
| Attributes | |
| ACN | 106942 |
| Time | |
| Date | 198903 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : btl |
| State Reference | MI |
| Altitude | msl bound lower : 15000 msl bound upper : 16000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : btl |
| Operator | other |
| Make Model Name | Military Transport |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| ASRS Report | 106942 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : developmental |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Trnee on local control combined with ground control and clearance delivery issued pilot the correct altimeter setting of 30.89. After a pause pilot read back 29.89. Neither the trnee nor I recognized the readback error. Pilot departed with altimeter reading 1000' below field elevation, and climbed to 16000' conflicting with an aircraft already at 16000'. Pilot's altimeter read 15000', but mode C indicated 16000'. Error was discovered by chicago center. I do not know what corrective action, if any, was taken by the center.
Original NASA ASRS Text
Title: DUE TO WRONG ALTIMETER SETTING, LESS THAN STANDARD SEPARATION OCCURRED BETWEEN AN MLT AND ANOTHER ACFT AT 16000'.
Narrative: TRNEE ON LCL CTL COMBINED WITH GND CTL AND CLRNC DELIVERY ISSUED PLT THE CORRECT ALTIMETER SETTING OF 30.89. AFTER A PAUSE PLT READ BACK 29.89. NEITHER THE TRNEE NOR I RECOGNIZED THE READBACK ERROR. PLT DEPARTED WITH ALTIMETER READING 1000' BELOW FIELD ELEVATION, AND CLBED TO 16000' CONFLICTING WITH AN ACFT ALREADY AT 16000'. PLT'S ALTIMETER READ 15000', BUT MODE C INDICATED 16000'. ERROR WAS DISCOVERED BY CHICAGO CENTER. I DO NOT KNOW WHAT CORRECTIVE ACTION, IF ANY, WAS TAKEN BY THE CENTER.
Data retrieved from NASA's ASRS site as of August 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.