Near midair collision between 2 small aircraft's in traffic pattern at prc.

Attributes
ACN	151548
Time
Date	199007
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : prc
State Reference	AZ
Altitude	msl bound lower : 800 msl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : prc
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	other
Flight Plan	None
Aircraft 2
Operator	general aviation : instructional
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
Experience	flight time last 90 days : 25 flight time total : 180 flight time type : 130
ASRS Report	151548
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was in a part 141 plane in right close traffic for runway 21. I heard another plane, small aircraft Y calling a 5 mi 45 entry to downwind. I looked but could not pick up until he called a 2 mi 45 degree. At that point I saw his position was not moving across a point on my windscreen. I rolled my wings then attempted a call to the tower to tell my position. As I became aware that the 45 degree traffic small aircraft Y did not see me I called his number and told my position over tower frequency. As before, I got stepped on by other calls, as I found out later. At this point, I descended 200' below traffic pattern altitude as he passed over the top of me. Then he became aware of me and widened out his downwind. Tower then asked him if he had me in sight. I talked to the other pilot on the ground and we agreed that if I had not descended we would have collided. This is the standard way to enter the pattern. We both feel that ATC might have advised us each that another plane was in the area.

Original NASA ASRS Text

Title: NMAC BETWEEN 2 SMA'S IN TRAFFIC PATTERN AT PRC.

Narrative: I WAS IN A PART 141 PLANE IN R CLOSE TFC FOR RWY 21. I HEARD ANOTHER PLANE, SMA Y CALLING A 5 MI 45 ENTRY TO DOWNWIND. I LOOKED BUT COULD NOT PICK UP UNTIL HE CALLED A 2 MI 45 DEG. AT THAT POINT I SAW HIS POS WAS NOT MOVING ACROSS A POINT ON MY WINDSCREEN. I ROLLED MY WINGS THEN ATTEMPTED A CALL TO THE TWR TO TELL MY POS. AS I BECAME AWARE THAT THE 45 DEG TFC SMA Y DID NOT SEE ME I CALLED HIS NUMBER AND TOLD MY POS OVER TWR FREQ. AS BEFORE, I GOT STEPPED ON BY OTHER CALLS, AS I FOUND OUT LATER. AT THIS POINT, I DSNDED 200' BELOW TFC PATTERN ALT AS HE PASSED OVER THE TOP OF ME. THEN HE BECAME AWARE OF ME AND WIDENED OUT HIS DOWNWIND. TWR THEN ASKED HIM IF HE HAD ME IN SIGHT. I TALKED TO THE OTHER PLT ON THE GND AND WE AGREED THAT IF I HAD NOT DSNDED WE WOULD HAVE COLLIDED. THIS IS THE STANDARD WAY TO ENTER THE PATTERN. WE BOTH FEEL THAT ATC MIGHT HAVE ADVISED US EACH THAT ANOTHER PLANE WAS IN THE AREA.

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.