Private pilot of an small aircraft sel penetrated class B airspace when he climbed above the floor of the controled airspace prior to reaching its outer limits. Approach controller observed his flight path and informed him of his incursion upon arrival to his home base.

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Attributes
ACN	394340
Time
Date	199802
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sgr
State Reference	TX
Altitude	msl bound lower : 4500 msl bound upper : 4500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iah
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 17 flight time total : 69 flight time type : 69
ASRS Report	394340
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	non adherence : far other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Upon return to sgr, I was informed by houston approach that I encroached in class B airspace by exceeding 4000 ft floor just inside outer radius. I was unaware of encroachment, believing I had climbed to 4500 ft MSL outside airspace limits as judged by ground references. Although houston approach stated the encroachment occurred inbound to sgr, it most likely occurred when flying outbound on 180- 360 degree heading at 4500 ft from iws airport. I was using city of brookshire as reference point outside of class B. Error probably occurred due to unawareness of exact aircraft position and exact class B boundary. Contributing factor may have been less focus due to only second passenger carried as a private pilot. Encroachment was in outer fringe of class B airspace. Error can be avoided in the future by allowing ample radial clearance outside class B limits before climbing to higher altitudes. This can be achieved by paying closer attention to aircraft position and airspace boundaries.

Original NASA ASRS Text

Title: PVT PLT OF AN SMA SEL PENETRATED CLASS B AIRSPACE WHEN HE CLBED ABOVE THE FLOOR OF THE CTLED AIRSPACE PRIOR TO REACHING ITS OUTER LIMITS. APCH CTLR OBSERVED HIS FLT PATH AND INFORMED HIM OF HIS INCURSION UPON ARR TO HIS HOME BASE.

Narrative: UPON RETURN TO SGR, I WAS INFORMED BY HOUSTON APCH THAT I ENCROACHED IN CLASS B AIRSPACE BY EXCEEDING 4000 FT FLOOR JUST INSIDE OUTER RADIUS. I WAS UNAWARE OF ENCROACHMENT, BELIEVING I HAD CLBED TO 4500 FT MSL OUTSIDE AIRSPACE LIMITS AS JUDGED BY GND REFS. ALTHOUGH HOUSTON APCH STATED THE ENCROACHMENT OCCURRED INBOUND TO SGR, IT MOST LIKELY OCCURRED WHEN FLYING OUTBOUND ON 180- 360 DEG HDG AT 4500 FT FROM IWS ARPT. I WAS USING CITY OF BROOKSHIRE AS REF POINT OUTSIDE OF CLASS B. ERROR PROBABLY OCCURRED DUE TO UNAWARENESS OF EXACT ACFT POS AND EXACT CLASS B BOUNDARY. CONTRIBUTING FACTOR MAY HAVE BEEN LESS FOCUS DUE TO ONLY SECOND PAX CARRIED AS A PVT PLT. ENCROACHMENT WAS IN OUTER FRINGE OF CLASS B AIRSPACE. ERROR CAN BE AVOIDED IN THE FUTURE BY ALLOWING AMPLE RADIAL CLRNC OUTSIDE CLASS B LIMITS BEFORE CLBING TO HIGHER ALTS. THIS CAN BE ACHIEVED BY PAYING CLOSER ATTN TO ACFT POS AND AIRSPACE BOUNDARIES.

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.