<< >> NASA ASRS Report 430420, March 1999

A GA pilot levels off 1000 ft above his assigned altitude and is corrected by departure controller at bwi, md.

Attributes
ACN	430420
Time
Date	199903
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : emi.vortac
State Reference	MO
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 5 flight time total : 2000 flight time type : 5
ASRS Report	430420
Person 2
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Events
Anomaly	altitude deviation : overshoot non adherence : far non adherence : published procedure non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : issued advisory
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Set altimeter to field elevation but did not check kollsman window. Was cleared to 3000 ft. Asked by ATC what altitude I was given. I said 3000 ft. They said I was at 4000 ft. I immediately descended to 3000 ft setting the altimeter by kollsman window to altimeter by ATC reading. Due to low pressure in area previous week's altimeter must have been below sea level! I've never had this happen before. Was not told to call ATC. Clear VFR at the time. En route to frederick for practice approachs.

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Original NASA ASRS Text

Title: A GA PLT LEVELS OFF 1000 FT ABOVE HIS ASSIGNED ALT AND IS CORRECTED BY DEP CTLR AT BWI, MD.

Narrative: SET ALTIMETER TO FIELD ELEVATION BUT DID NOT CHK KOLLSMAN WINDOW. WAS CLRED TO 3000 FT. ASKED BY ATC WHAT ALT I WAS GIVEN. I SAID 3000 FT. THEY SAID I WAS AT 4000 FT. I IMMEDIATELY DSNDED TO 3000 FT SETTING THE ALTIMETER BY KOLLSMAN WINDOW TO ALTIMETER BY ATC READING. DUE TO LOW PRESSURE IN AREA PREVIOUS WK'S ALTIMETER MUST HAVE BEEN BELOW SEA LEVEL! I'VE NEVER HAD THIS HAPPEN BEFORE. WAS NOT TOLD TO CALL ATC. CLR VFR AT THE TIME. ENRTE TO FREDERICK FOR PRACTICE APCHS.

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.