|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||airport : gri|
|Altitude||msl bound lower : 4000|
msl bound upper : 4300
|Operator||general aviation : corporate|
|Make Model Name||Small Transport, Low Wing, 2 Recip Eng|
|Flight Phase||cruise other|
|Route In Use||enroute airway : zmp|
|Function||flight crew : single pilot|
|Qualification||pilot : commercial|
pilot : instrument
pilot : cfi
|Experience||flight time last 90 days : 120|
flight time total : 2200
flight time type : 300
|Affiliation||government : faa|
|Function||controller : radar|
|Qualification||controller : radar|
|Anomaly||altitude deviation : overshoot|
non adherence : clearance
other anomaly other
|Independent Detector||other controllera|
|Resolutory Action||controller : issued new clearance|
flight crew : returned to intended course or assigned course
|Consequence||faa : reviewed incident with flight crew|
|Air Traffic Incident||Pilot Deviation|
Departed gri, IFR and climbed to initial clearance altitude of 4000 ft. My altimeter was set to 29.70 inches which was what the current gri ATIS reported. ZMP then told me I was 300 ft high and that the gri ATIS was 29.90. I reset my altimeter and then it indicated 200 ft high, I then descended the 200 ft to 4000 ft MSL. Soon after, another flight called ZMP and told them the current gri ATIS reported 29.70. ZMP replied saying they would call gri tower and resolve the problem. The gri ATIS also reported rapidly falling barometer. I believe there was a lack of communication between gri tower and ZMP causing me to have an improper altimeter setting creating the altitude deviation, or possibly one or both of the controllers having improper barometric pressure reports.
Original NASA ASRS Text
Title: CTR CTLR SHOWS SMT 300 FT HIGH, QUESTIONS ALTIMETER SETTING RECEIVED FROM ATIS BROADCAST. ALTDEV ALT EXCURSION CLAIMED BY CTR.
Narrative: DEPARTED GRI, IFR AND CLBED TO INITIAL CLRNC ALT OF 4000 FT. MY ALTIMETER WAS SET TO 29.70 INCHES WHICH WAS WHAT THE CURRENT GRI ATIS RPTED. ZMP THEN TOLD ME I WAS 300 FT HIGH AND THAT THE GRI ATIS WAS 29.90. I RESET MY ALTIMETER AND THEN IT INDICATED 200 FT HIGH, I THEN DSNDED THE 200 FT TO 4000 FT MSL. SOON AFTER, ANOTHER FLT CALLED ZMP AND TOLD THEM THE CURRENT GRI ATIS RPTED 29.70. ZMP REPLIED SAYING THEY WOULD CALL GRI TWR AND RESOLVE THE PROB. THE GRI ATIS ALSO RPTED RAPIDLY FALLING BAROMETER. I BELIEVE THERE WAS A LACK OF COM BTWN GRI TWR AND ZMP CAUSING ME TO HAVE AN IMPROPER ALTIMETER SETTING CREATING THE ALTDEV, OR POSSIBLY ONE OR BOTH OF THE CTLRS HAVING IMPROPER BAROMETRIC PRESSURE RPTS.
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.