Corp aircraft on final has a potential conflict with another corp aircraft who is NORAC. TA not given by tower as traffic was unknown VFR traffic. Training in progress in both aircraft.

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Attributes
ACN	341265
Time
Date	199607
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mrb
State Reference	WV
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mrb artcc : zan
Operator	general aviation : corporate
Make Model Name	Gulfstream IV
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	HS 125 Series 700
Operating Under FAR Part	Part 91
Flight Phase	descent : approach landing : go around
Route In Use	approach : straight in
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : first officer observation : company check pilot oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 6000 flight time type : 200
ASRS Report	341265
Person 2
Affiliation	Other
Function	flight crew : captain instruction : trainee
Qualification	pilot : atp
Events
Anomaly	altitude deviation : crossing restriction not met conflict : airborne less severe non adherence : far non adherence : published procedure other anomaly other other anomaly other
Independent Detector	other flight crewa other other : unspecified
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 200 vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

VMC condition, VFR pattern to controled airport. C172 traffic was called out on 3 NM final as we are midfield on downwind. We are concentrating on C172 to assure good spacing and start our turn to base, lower gear and start before landing checklist. Tower clears us for touch-and-go and we start turn to final. I'm training new pilot who is flying left seat. I'm 'inside' completing checklist as he, trainee, turns final. Passenger in back asks if we had the other aircraft in sight. By then we had completed our turn onto final and the left seat pilot has the traffic turning and climbing on the left side. I asked tower where the traffic came from but they had no information on it and were not in communication with the aircraft. The aircraft had apparently shot a practice ILS without clearing with anyone and transited the airport area without clearance. In the future if I'm doing a checklist, I'll stop to clear final and assure the other pilot does also.

Original NASA ASRS Text

Title: CORP ACFT ON FINAL HAS A POTENTIAL CONFLICT WITH ANOTHER CORP ACFT WHO IS NORAC. TA NOT GIVEN BY TWR AS TFC WAS UNKNOWN VFR TFC. TRAINING IN PROGRESS IN BOTH ACFT.

Narrative: VMC CONDITION, VFR PATTERN TO CTLED ARPT. C172 TFC WAS CALLED OUT ON 3 NM FINAL AS WE ARE MIDFIELD ON DOWNWIND. WE ARE CONCENTRATING ON C172 TO ASSURE GOOD SPACING AND START OUR TURN TO BASE, LOWER GEAR AND START BEFORE LNDG CHKLIST. TWR CLRS US FOR TOUCH-AND-GO AND WE START TURN TO FINAL. I'M TRAINING NEW PLT WHO IS FLYING L SEAT. I'M 'INSIDE' COMPLETING CHKLIST AS HE, TRAINEE, TURNS FINAL. PAX IN BACK ASKS IF WE HAD THE OTHER ACFT IN SIGHT. BY THEN WE HAD COMPLETED OUR TURN ONTO FINAL AND THE L SEAT PLT HAS THE TFC TURNING AND CLBING ON THE L SIDE. I ASKED TWR WHERE THE TFC CAME FROM BUT THEY HAD NO INFO ON IT AND WERE NOT IN COM WITH THE ACFT. THE ACFT HAD APPARENTLY SHOT A PRACTICE ILS WITHOUT CLRING WITH ANYONE AND TRANSITED THE ARPT AREA WITHOUT CLRNC. IN THE FUTURE IF I'M DOING A CHKLIST, I'LL STOP TO CLR FINAL AND ASSURE THE OTHER PLT DOES ALSO.

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.