C172 pilot had incursion of phx class B airspace.

Attributes
ACN	474520
Time
Date	200005
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : phx.airport
Altitude	msl single value : 3900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sdl.tower
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute : direct
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 5 flight time total : 600 flight time type : 250
ASRS Report	474520
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Events
Anomaly	airspace violation : entry non adherence : far non adherence : published procedure other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited penetrated airspace
Supplementary
Problem Areas	Chart Or Publication Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
Chart	star : + terminal area : phx

Narrative:

Did not accurately monitor position and may have entered phx class B airspace at corner of gilbert and cactus roads -- northeast portion of class B airspace. Floor is 3000 ft, I was at 3900 ft. Once I realized it, turned northeast and dove to 2900 ft to be sure I was out of class B airspace. Recommendation -- these streets do not exist on the ground at this location -- difficult to ascertain aircraft position. Perhaps DME arc from pxr VOR would work better.

Original NASA ASRS Text

Title: C172 PLT HAD INCURSION OF PHX CLASS B AIRSPACE.

Narrative: DID NOT ACCURATELY MONITOR POSITION AND MAY HAVE ENTERED PHX CLASS B AIRSPACE AT CORNER OF GILBERT AND CACTUS ROADS -- NE PORTION OF CLASS B AIRSPACE. FLOOR IS 3000 FT, I WAS AT 3900 FT. ONCE I REALIZED IT, TURNED NE AND DOVE TO 2900 FT TO BE SURE I WAS OUT OF CLASS B AIRSPACE. RECOMMENDATION -- THESE STREETS DO NOT EXIST ON THE GND AT THIS LOCATION -- DIFFICULT TO ASCERTAIN ACFT POSITION. PERHAPS DME ARC FROM PXR VOR WOULD WORK BETTER.

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.