Near midair collision.

Attributes
ACN	282400
Time
Date	199409
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sdl
State Reference	AZ
Altitude	msl bound lower : 2600 msl bound upper : 3000
Aircraft 1
Controlling Facilities	tower : sdl
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 80 flight time total : 10000 flight time type : 40
ASRS Report	282400
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	conflict : nmac non adherence : clearance
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented other
Consequence	Other
Miss Distance	vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Asked for permission to transit air traffic area, scottsdale, az, (class D airspace) sdl tower said ok and to report over airport. We flew over at 2600 ft not realizing sdl pattern was 2500 ft. Other aircraft reported. A near miss with us to tower -- we never saw other aircraft. Sdl tower said they had told us to maintain 3000 ft which we never heard. (I don't think they even communicated that to us). Guess we need to be more vigilant.

Original NASA ASRS Text

Title: NMAC.

Narrative: ASKED FOR PERMISSION TO TRANSIT ATA, SCOTTSDALE, AZ, (CLASS D AIRSPACE) SDL TWR SAID OK AND TO RPT OVER ARPT. WE FLEW OVER AT 2600 FT NOT REALIZING SDL PATTERN WAS 2500 FT. OTHER ACFT RPTED. A NEAR MISS WITH US TO TWR -- WE NEVER SAW OTHER ACFT. SDL TWR SAID THEY HAD TOLD US TO MAINTAIN 3000 FT WHICH WE NEVER HEARD. (I DON'T THINK THEY EVEN COMMUNICATED THAT TO US). GUESS WE NEED TO BE MORE VIGILANT.

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.