Private pilot of a C182 inadvertently penetrated class B airspace when attempting to fly underneath toward the primary airport. This occurred after being unsuccessful in obtaining clearance from ATC outside of the airspace due to their inability to observe his transponder code.

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Attributes
ACN	390700
Time
Date	199801
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : las
State Reference	NV
Altitude	msl bound lower : 4500 msl bound upper : 4900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : las
Operator	general aviation : personal
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Flight Phase	cruise other descent other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 11 flight time total : 111
ASRS Report	390700
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance 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:

Unable to contact las approach, very busy. When contact made at search light and transponder code assigned las unable to read transponder and was told to stay outside of class B airspace. I circled 3 times and approach still could not read my transponder. I then decided to fly under the class B and go into north las vegas. However, approximately 9 mi out of las VOR on a 120 degree radial las approach was able to read my transponder. I was then given directions to turn right and enter a base for runway 25L and call the numbers. At approximately 7 mi on left base for runway 25L, another controller told me to turn toward right and climb to 4500 ft. While watching on-coming traffic, I went past 4500 ft to 4900 ft. Again the controller said to go 4500 ft and turn left for landing on runway 19R. Upon leaving the active, ground control told me to call approach on land line and explain my actions. I believe that I had been cleared into class B airspace. Contributing factors: very busy approach frequency and talking to numerous controllers. I talked to 3 different controllers during this incident.

Original NASA ASRS Text

Title: PVT PLT OF A C182 INADVERTENTLY PENETRATED CLASS B AIRSPACE WHEN ATTEMPTING TO FLY UNDERNEATH TOWARD THE PRIMARY ARPT. THIS OCCURRED AFTER BEING UNSUCCESSFUL IN OBTAINING CLRNC FROM ATC OUTSIDE OF THE AIRSPACE DUE TO THEIR INABILITY TO OBSERVE HIS XPONDER CODE.

Narrative: UNABLE TO CONTACT LAS APCH, VERY BUSY. WHEN CONTACT MADE AT SEARCH LIGHT AND XPONDER CODE ASSIGNED LAS UNABLE TO READ XPONDER AND WAS TOLD TO STAY OUTSIDE OF CLASS B AIRSPACE. I CIRCLED 3 TIMES AND APCH STILL COULD NOT READ MY XPONDER. I THEN DECIDED TO FLY UNDER THE CLASS B AND GO INTO NORTH LAS VEGAS. HOWEVER, APPROX 9 MI OUT OF LAS VOR ON A 120 DEG RADIAL LAS APCH WAS ABLE TO READ MY XPONDER. I WAS THEN GIVEN DIRECTIONS TO TURN R AND ENTER A BASE FOR RWY 25L AND CALL THE NUMBERS. AT APPROX 7 MI ON L BASE FOR RWY 25L, ANOTHER CTLR TOLD ME TO TURN TOWARD R AND CLB TO 4500 FT. WHILE WATCHING ON-COMING TFC, I WENT PAST 4500 FT TO 4900 FT. AGAIN THE CTLR SAID TO GO 4500 FT AND TURN L FOR LNDG ON RWY 19R. UPON LEAVING THE ACTIVE, GND CTL TOLD ME TO CALL APCH ON LAND LINE AND EXPLAIN MY ACTIONS. I BELIEVE THAT I HAD BEEN CLRED INTO CLASS B AIRSPACE. CONTRIBUTING FACTORS: VERY BUSY APCH FREQ AND TALKING TO NUMEROUS CTLRS. I TALKED TO 3 DIFFERENT CTLRS DURING THIS INCIDENT.

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.