C172 cuts out BE35 on IFR approach to prc.

Attributes
ACN	460944
Time
Date	200001
Day	Mon
Local Time Of Day	0601 To 1200
Place
State Reference	AZ
Altitude	msl single value : 8300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zab.artcc tower : prc.tower tower : hou.tower
Operator	general aviation : personal
Make Model Name	Bonanza 35
Operating Under FAR Part	Part 91
Route In Use	approach : instrument precision approach other enroute airway : v12.airway
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : prc.tower
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : instrument precision approach other
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Experience	controller non radar : 8.5 controller radar : 5.5
ASRS Report	460944
Person 2
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : instrument
Events
Anomaly	conflict : airborne critical non adherence : published procedure non adherence other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued advisory flight crew : took precautionary avoidance action
Miss Distance	horizontal : 1500 vertical : 0
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure ATC Human Performance Navigational Facility
Primary Problem	Flight Crew Human Performance

Narrative:

This was a classic situation that happened here at prc. The bonanza pilot later wrote to us to 'open a dialogue.' IFR bonanza X on a cross country chose prc as an intermediate destination. Unfamiliar with the area, he asked for the ILS approach. Due to workload considerations and equipment limitations, ZAB does not provide services for practice approachs or IFR arrs. Per normal SOP, the bonanza was cleared for the approach and changed to prc. On initial contact, traffic was exchanged between the 2 aircraft. The cessna Y reported the bonanza in sight and the assumption was made by the bonanza pilot that the cessna would execute the approach after the bonanza. Instead, the cessna preceded the bonanza on the drk 061 degree radial for the transition. As the bonanza became established on the radial, he observed the cessna. He was also aware that the 061 degree radial is also V12. He observed the cessna continue eastbound across the localizer so assumed he was on V12. He then went head down to transition to the localizer course. As he brought his head up for the scan, the cessna crossed right to left directly in front -- attempting to capture the localizer. The bonanza pilot felt that the instructor pilot or ZAB or prc should have helped. Without radar display, we can't help and ZAB can't, due to display constraints.

Original NASA ASRS Text

Title: C172 CUTS OUT BE35 ON IFR APCH TO PRC.

Narrative: THIS WAS A CLASSIC SIT THAT HAPPENED HERE AT PRC. THE BONANZA PLT LATER WROTE TO US TO 'OPEN A DIALOGUE.' IFR BONANZA X ON A XCOUNTRY CHOSE PRC AS AN INTERMEDIATE DEST. UNFAMILIAR WITH THE AREA, HE ASKED FOR THE ILS APCH. DUE TO WORKLOAD CONSIDERATIONS AND EQUIP LIMITATIONS, ZAB DOES NOT PROVIDE SVCS FOR PRACTICE APCHS OR IFR ARRS. PER NORMAL SOP, THE BONANZA WAS CLRED FOR THE APCH AND CHANGED TO PRC. ON INITIAL CONTACT, TFC WAS EXCHANGED BTWN THE 2 ACFT. THE CESSNA Y RPTED THE BONANZA IN SIGHT AND THE ASSUMPTION WAS MADE BY THE BONANZA PLT THAT THE CESSNA WOULD EXECUTE THE APCH AFTER THE BONANZA. INSTEAD, THE CESSNA PRECEDED THE BONANZA ON THE DRK 061 DEG RADIAL FOR THE TRANSITION. AS THE BONANZA BECAME ESTABLISHED ON THE RADIAL, HE OBSERVED THE CESSNA. HE WAS ALSO AWARE THAT THE 061 DEG RADIAL IS ALSO V12. HE OBSERVED THE CESSNA CONTINUE EBOUND ACROSS THE LOC SO ASSUMED HE WAS ON V12. HE THEN WENT HEAD DOWN TO TRANSITION TO THE LOC COURSE. AS HE BROUGHT HIS HEAD UP FOR THE SCAN, THE CESSNA CROSSED R TO L DIRECTLY IN FRONT -- ATTEMPTING TO CAPTURE THE LOC. THE BONANZA PLT FELT THAT THE INSTRUCTOR PLT OR ZAB OR PRC SHOULD HAVE HELPED. WITHOUT RADAR DISPLAY, WE CAN'T HELP AND ZAB CAN'T, DUE TO DISPLAY CONSTRAINTS.

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.