Near midair collision between an small aircraft twin aircraft inbound at the initial approach fix on VFR practice ILS approach and an IFR small aircraft sel aircraft turning inbound from the procedure turn.

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Attributes
ACN	267741
Time
Date	199404
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : gcc
State Reference	WY
Altitude	msl bound lower : 6400 msl bound upper : 6500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : gcc
Operator	general aviation : instructional
Make Model Name	PA-44 Seminole Turbo Seminole
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	VFR
Aircraft 2
Make Model Name	PA-28 Cherokee Arrow IV
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 75 flight time total : 5100 flight time type : 200
ASRS Report	267741
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : private
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Executing a practice ILS (straight-in) to gcc (runway 35), we were instructed to intercept and track inbound to the airport. The tower controller (no radar) advised me there may be a delay, but also advised us to continue inbound and that there was an IFR inbound at the time. We received no further TA's from the tower controller. We were at the published initial altitude for the straight-in procedure. We looked up just as the #2 aircraft (a southeast low wing) was crossing the approach course about 100 ft above us. Apparently the aircraft was intercepting the ILS from the published procedure turn. In this situation, it would be good for the tower controller in a non- radar environment to advise us to maintain a separate altitude (say 500 ft above or below the IFR inbound) until we both got firm position reports, or the controller had visual contact (or we got TA's which led both of us to visual contact with each concerned aircraft). Training materials might emphasize the importance of position reporting in a visual non-radar training IFR environment with controller assistance.

Original NASA ASRS Text

Title: NMAC BTWN AN SMA TWIN ACFT INBOUND AT THE INITIAL APCH FIX ON VFR PRACTICE ILS APCH AND AN IFR SMA SEL ACFT TURNING INBOUND FROM THE PROC TURN.

Narrative: EXECUTING A PRACTICE ILS (STRAIGHT-IN) TO GCC (RWY 35), WE WERE INSTRUCTED TO INTERCEPT AND TRACK INBOUND TO THE ARPT. THE TWR CTLR (NO RADAR) ADVISED ME THERE MAY BE A DELAY, BUT ALSO ADVISED US TO CONTINUE INBOUND AND THAT THERE WAS AN IFR INBOUND AT THE TIME. WE RECEIVED NO FURTHER TA'S FROM THE TWR CTLR. WE WERE AT THE PUBLISHED INITIAL ALT FOR THE STRAIGHT-IN PROC. WE LOOKED UP JUST AS THE #2 ACFT (A SE LOW WING) WAS XING THE APCH COURSE ABOUT 100 FT ABOVE US. APPARENTLY THE ACFT WAS INTERCEPTING THE ILS FROM THE PUBLISHED PROC TURN. IN THIS SIT, IT WOULD BE GOOD FOR THE TWR CTLR IN A NON- RADAR ENVIRONMENT TO ADVISE US TO MAINTAIN A SEPARATE ALT (SAY 500 FT ABOVE OR BELOW THE IFR INBOUND) UNTIL WE BOTH GOT FIRM POS RPTS, OR THE CTLR HAD VISUAL CONTACT (OR WE GOT TA'S WHICH LED BOTH OF US TO VISUAL CONTACT WITH EACH CONCERNED ACFT). TRAINING MATERIALS MIGHT EMPHASIZE THE IMPORTANCE OF POS RPTING IN A VISUAL NON-RADAR TRAINING IFR ENVIRONMENT WITH CTLR ASSISTANCE.

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.