Close proximity 2 GA small aircraft training aircraft starting a DME arc approach to prc.

Attributes
ACN	153480
Time
Date	199008
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : drk airport : prc
State Reference	AZ
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : prc
Operator	general aviation : instructional
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	cruise other descent : approach
Route In Use	approach : visual
Flight Plan	None
Aircraft 2
Operator	general aviation : instructional
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	cruise other descent : approach
Route In Use	approach : visual
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 250 flight time total : 4125 flight time type : 600
ASRS Report	153480
Person 2
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 1450 flight time type : 210
ASRS Report	153814
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 50 vertical : 50
Supplementary
Primary Problem	Flight Crew Human Performance
Situations
ATC Facility	other physical facility

Narrative:

2 FBO small aircraft were executing the VOR runway 11 approach at the same time. Both aircraft were executing the approach in VFR conditions west/O IFR sep and west/O radar. Both aircraft wound up at the DME arc at the same time, resulting in a near miss (within 50' vertical sep). Tower did not advise aircraft position to either aircraft. Incident could have been prevented if tower had radar. Supplemental information from acn 153814: as we turned on 10 DME arc another aircraft reported on the arc. I immediately executed a climbing right turn and got off the arc. Could have been avoided if we had radar. Very busy airport with high intensity flight training!

Original NASA ASRS Text

Title: CLOSE PROX 2 GA SMA TRAINING ACFT STARTING A DME ARC APCH TO PRC.

Narrative: 2 FBO SMA WERE EXECUTING THE VOR RWY 11 APCH AT THE SAME TIME. BOTH ACFT WERE EXECUTING THE APCH IN VFR CONDITIONS W/O IFR SEP AND W/O RADAR. BOTH ACFT WOUND UP AT THE DME ARC AT THE SAME TIME, RESULTING IN A NEAR MISS (WITHIN 50' VERT SEP). TWR DID NOT ADVISE ACFT POS TO EITHER ACFT. INCIDENT COULD HAVE BEEN PREVENTED IF TWR HAD RADAR. SUPPLEMENTAL INFO FROM ACN 153814: AS WE TURNED ON 10 DME ARC ANOTHER ACFT RPTED ON THE ARC. I IMMEDIATELY EXECUTED A CLBING RIGHT TURN AND GOT OFF THE ARC. COULD HAVE BEEN AVOIDED IF WE HAD RADAR. VERY BUSY ARPT WITH HIGH INTENSITY FLT TRNING!

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.