Reporter states that nxx consistently reports altimeter settings 40' higher than nearby airports.

Attributes
ACN	153752
Time
Date	199008
Place
Locale Reference	airport : nxx
State Reference	PA
Altitude	agl bound lower : 0 agl bound upper : 40
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : cfi pilot : atp pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 10900
ASRS Report	153752
Person 2
Affiliation	government : faa
Function	controller : flight data
Qualification	controller : non radar
Events
Anomaly	other anomaly other
Independent Detector	other other : unspecified cockpit
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Airport
Air Traffic Incident	other

Narrative:

I have tried to no avail for the past 4 yrs to get an adequate explanation as to why the willow grove NAS in willow grove, PA always reports an altimeter (znh) setting 40' higher than surrounding airfields (tnn, pne, phl, etc). I think something is wrong with the height of this static source or correction factors for installation.

Original NASA ASRS Text

Title: REPORTER STATES THAT NXX CONSISTENTLY REPORTS ALTIMETER SETTINGS 40' HIGHER THAN NEARBY ARPTS.

Narrative: I HAVE TRIED TO NO AVAIL FOR THE PAST 4 YRS TO GET AN ADEQUATE EXPLANATION AS TO WHY THE WILLOW GROVE NAS IN WILLOW GROVE, PA ALWAYS RPTS AN ALTIMETER (ZNH) SETTING 40' HIGHER THAN SURROUNDING AIRFIELDS (TNN, PNE, PHL, ETC). I THINK SOMETHING IS WRONG WITH THE HEIGHT OF THIS STATIC SOURCE OR CORRECTION FACTORS FOR INSTALLATION.

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.