C177 has an near midair collision with a light twin after an unauthorized penetration of iwa airspac...

Attributes
ACN	692959
Time
Date	200604
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iwa.airport
State Reference	AZ
Altitude	msl single value : 2800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : iwa.tower
Operator	general aviation : personal
Make Model Name	Cardinal 177/177RG
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : iwa.tower
Operator	general aviation : personal
Make Model Name	Small Aircraft Low Wing 2 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 17 flight time total : 245 flight time type : 160
ASRS Report	692959
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	aircraft equipment problem : critical conflict : nmac
Independent Detector	other controllerb other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 300 vertical : 200
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

I contacted chandler ATC when I was 15 mi east of them; which was about 3 mi southeast of williams gateway. I misread the sectional and flew into airspace controled by williams gateway. I crossed a couple mi off the end of runway 12 at 2800 ft; which was 200 ft higher than their pattern altitude. At the same time; a small twin engine aircraft passed underneath me. By that time; when I was well within williams gateway airspace; I had made contact with williams gateway ATC. I had been in radio contact with chandler ATC but they informed me to contact williams gateway. Just after I contacted them; I saw the small twin below me and to the right. That plane passed underneath me then turned right to the same heading I was on. I climbed to 3000 ft or so to stay well clear. While the incident was my fault; I think chandler ATC and williams gateway ATC should have been more attentive. Chandler should have informed me earlier to contact the correct facility while williams gateway should have directed the small twin away from me.

Original NASA ASRS Text

Title: C177 HAS AN NMAC WITH A LIGHT TWIN AFTER AN UNAUTH PENETRATION OF IWA AIRSPACE.

Narrative: I CONTACTED CHANDLER ATC WHEN I WAS 15 MI E OF THEM; WHICH WAS ABOUT 3 MI SE OF WILLIAMS GATEWAY. I MISREAD THE SECTIONAL AND FLEW INTO AIRSPACE CTLED BY WILLIAMS GATEWAY. I CROSSED A COUPLE MI OFF THE END OF RWY 12 AT 2800 FT; WHICH WAS 200 FT HIGHER THAN THEIR PATTERN ALT. AT THE SAME TIME; A SMALL TWIN ENG ACFT PASSED UNDERNEATH ME. BY THAT TIME; WHEN I WAS WELL WITHIN WILLIAMS GATEWAY AIRSPACE; I HAD MADE CONTACT WITH WILLIAMS GATEWAY ATC. I HAD BEEN IN RADIO CONTACT WITH CHANDLER ATC BUT THEY INFORMED ME TO CONTACT WILLIAMS GATEWAY. JUST AFTER I CONTACTED THEM; I SAW THE SMALL TWIN BELOW ME AND TO THE R. THAT PLANE PASSED UNDERNEATH ME THEN TURNED R TO THE SAME HDG I WAS ON. I CLBED TO 3000 FT OR SO TO STAY WELL CLR. WHILE THE INCIDENT WAS MY FAULT; I THINK CHANDLER ATC AND WILLIAMS GATEWAY ATC SHOULD HAVE BEEN MORE ATTENTIVE. CHANDLER SHOULD HAVE INFORMED ME EARLIER TO CONTACT THE CORRECT FACILITY WHILE WILLIAMS GATEWAY SHOULD HAVE DIRECTED THE SMALL TWIN AWAY FROM ME.

Data retrieved from NASA's ASRS site as of January 2009 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.

C177 has an near midair collision with a light twin after an unauthorized penetration of iwa airspace.