Close proximity GA-small aircraft in traffic and GA-small aircraft making 45 degree entry.

Attributes
ACN	106243
Time
Date	198903
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : apa
State Reference	CO
Altitude	agl bound lower : 800 agl bound upper : 800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : apa
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	other
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 4 flight time total : 2000 flight time type : 1000
ASRS Report	106243
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac
Independent Detector	other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 50 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was on a left downwind for runway 17 and advised of an aircraft, small aircraft Y to my right. He was only 50' away, also downwind. I did not see the aircraft prior to being advised by the tower. He must have been making a 45 degree entry from the east and did not see me. The tower said they had a trainee on at the time and failed to advise me sooner.

Original NASA ASRS Text

Title: CLOSE PROX GA-SMA IN TRAFFIC AND GA-SMA MAKING 45 DEGREE ENTRY.

Narrative: I WAS ON A L DOWNWIND FOR RWY 17 AND ADVISED OF AN ACFT, SMA Y TO MY RIGHT. HE WAS ONLY 50' AWAY, ALSO DOWNWIND. I DID NOT SEE THE ACFT PRIOR TO BEING ADVISED BY THE TWR. HE MUST HAVE BEEN MAKING A 45 DEG ENTRY FROM THE E AND DID NOT SEE ME. THE TWR SAID THEY HAD A TRAINEE ON AT THE TIME AND FAILED TO ADVISE ME SOONER.

Data retrieved from NASA's ASRS site as of August 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.