<< >> NASA ASRS Report 244722, June 1993

Center controller shows small transport 300 ft high, questions altimeter setting received from ATIS broadcast. Altitude deviation altitude excursion claimed by center.

Attributes
ACN	244722
Time
Date	199306
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : gri
State Reference	NE
Altitude	msl bound lower : 4000 msl bound upper : 4300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Route In Use	enroute airway : zmp
Flight Plan	IFR
Person 1
Affiliation	Other
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
ASRS Report	244722
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
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
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation other

Narrative:

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.

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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.