Reporter descended 200 ft to miss another airplane also on entry to downwind that apparently did not make any of the customary calls entering the pattern.

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Attributes
ACN	287245
Time
Date	199410
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dto
State Reference	TX
Altitude	agl bound lower : 100 agl bound upper : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	landing other
Flight Plan	VFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 250 flight time total : 1100 flight time type : 400
ASRS Report	287245
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : nmac other anomaly other other spatial deviation
Independent Detector	other other : unspecified cockpit
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was inbound to land at denton municipal airport (dto) from the west. I was headed to cross midfield to enter a left downwind to land runway 17. I monitored the local unicom frequency (122.7) to determine the amount and location of traffic in the area. At approximately 2 mi west of the field, I radioed my location and intentions. As I approached midfield, I heard an aircraft radio that he was 'final 17, denton, for touch and go.' I responded that I was midfield preparing to enter a left downwind for runway 17 at traffic pattern altitude. As I crossed midfield. I noticed an aircraft at my 12 O'clock position. To avoid any conflict. I immediately descended 200-300 ft while in a right turn to 180 degrees to position myself behind the aircraft I had seen. When I thought I had adequate clearance, I made a climbing left turn back to 360 degrees and traffic pattern altitude. I then continued in the pattern for a normal landing without further incident. The incident probably could have been avoided had the other aircraft been monitoring or notifying other aircraft of their intentions.

Original NASA ASRS Text

Title: RPTR DSNDED 200 FT TO MISS ANOTHER AIRPLANE ALSO ON ENTRY TO DOWNWIND THAT APPARENTLY DID NOT MAKE ANY OF THE CUSTOMARY CALLS ENTERING THE PATTERN.

Narrative: I WAS INBOUND TO LAND AT DENTON MUNICIPAL ARPT (DTO) FROM THE W. I WAS HEADED TO CROSS MIDFIELD TO ENTER A L DOWNWIND TO LAND RWY 17. I MONITORED THE LCL UNICOM FREQ (122.7) TO DETERMINE THE AMOUNT AND LOCATION OF TFC IN THE AREA. AT APPROX 2 MI W OF THE FIELD, I RADIOED MY LOCATION AND INTENTIONS. AS I APCHED MIDFIELD, I HEARD AN ACFT RADIO THAT HE WAS 'FINAL 17, DENTON, FOR TOUCH AND GO.' I RESPONDED THAT I WAS MIDFIELD PREPARING TO ENTER A L DOWNWIND FOR RWY 17 AT TFC PATTERN ALT. AS I CROSSED MIDFIELD. I NOTICED AN ACFT AT MY 12 O'CLOCK POS. TO AVOID ANY CONFLICT. I IMMEDIATELY DSNDED 200-300 FT WHILE IN A R TURN TO 180 DEGS TO POS MYSELF BEHIND THE ACFT I HAD SEEN. WHEN I THOUGHT I HAD ADEQUATE CLRNC, I MADE A CLBING L TURN BACK TO 360 DEGS AND TFC PATTERN ALT. I THEN CONTINUED IN THE PATTERN FOR A NORMAL LNDG WITHOUT FURTHER INCIDENT. THE INCIDENT PROBABLY COULD HAVE BEEN AVOIDED HAD THE OTHER ACFT BEEN MONITORING OR NOTIFYING OTHER ACFT OF THEIR INTENTIONS.

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.