Prc controller concerned with MO20's apparent lack of understanding when issued traffic pattern entr...

Attributes
ACN	461837
Time
Date	200002
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : prc.airport
State Reference	AZ
Altitude	msl single value : 5800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : prc.tower
Operator	general aviation : personal
Make Model Name	M-20 Scotsman
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Experience	controller military : 8 controller radar : 8
ASRS Report	461837
Person 2
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : airborne less severe non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action
Miss Distance	horizontal : 1500 vertical : 0
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Mooney X was instructed to make right traffic for runway 21R and report a 2 mi right 45 degree entry to downwind. Mooney replied he would do as instructed. The mooney showed up on a 45 degree entry to final and rolled out on opposite direction to downwind. I instructed the mooney to make a 180 degrees turn back to downwind. I then instructed the BE76 (aircraft Y) to turn to the left and widen out downwind so as not to conflict with the mooney. Then the BE76 continued and followed the mooney. The mooney pilot had not flown into prc in a while and he did not follow ATC instructions. Had he advised he was unsure of his position, I could have given an altitude restr or something to help deconflict this potential hazard. This was only corrected when I visually observed the mooney. With numerous aircraft in the local pattern, we must have good position reports. Prc is the busiest airport in the world without radar. Had we had a radar display or d-brite in this tower, this would have been avoided. No human performance considerations.

Original NASA ASRS Text

Title: PRC CTLR CONCERNED WITH MO20'S APPARENT LACK OF UNDERSTANDING WHEN ISSUED TFC PATTERN ENTRY INSTRUCTIONS.

Narrative: MOONEY X WAS INSTRUCTED TO MAKE R TFC FOR RWY 21R AND RPT A 2 MI R 45 DEG ENTRY TO DOWNWIND. MOONEY REPLIED HE WOULD DO AS INSTRUCTED. THE MOONEY SHOWED UP ON A 45 DEG ENTRY TO FINAL AND ROLLED OUT ON OPPOSITE DIRECTION TO DOWNWIND. I INSTRUCTED THE MOONEY TO MAKE A 180 DEGS TURN BACK TO DOWNWIND. I THEN INSTRUCTED THE BE76 (ACFT Y) TO TURN TO THE L AND WIDEN OUT DOWNWIND SO AS NOT TO CONFLICT WITH THE MOONEY. THEN THE BE76 CONTINUED AND FOLLOWED THE MOONEY. THE MOONEY PLT HAD NOT FLOWN INTO PRC IN A WHILE AND HE DID NOT FOLLOW ATC INSTRUCTIONS. HAD HE ADVISED HE WAS UNSURE OF HIS POS, I COULD HAVE GIVEN AN ALT RESTR OR SOMETHING TO HELP DECONFLICT THIS POTENTIAL HAZARD. THIS WAS ONLY CORRECTED WHEN I VISUALLY OBSERVED THE MOONEY. WITH NUMEROUS ACFT IN THE LCL PATTERN, WE MUST HAVE GOOD POS RPTS. PRC IS THE BUSIEST ARPT IN THE WORLD WITHOUT RADAR. HAD WE HAD A RADAR DISPLAY OR D-BRITE IN THIS TWR, THIS WOULD HAVE BEEN AVOIDED. NO HUMAN PERFORMANCE CONSIDERATIONS.

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.

Prc controller concerned with MO20's apparent lack of understanding when issued traffic pattern entry instructions.