Potential conflict at a non tower airport CTAF.

Attributes
ACN	174537
Time
Date	199104
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : okk
State Reference	IN
Altitude	msl bound lower : 1400 msl bound upper : 1400
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent : approach landing other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other descent : approach
Route In Use	approach : visual
Flight Plan	VFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 5500
ASRS Report	174537
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe inflight encounter : vfr in imc non adherence : published procedure non adherence : clearance non adherence : far other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At approximately PM00 local time, we were descending on the G/south of the ILS 23 at okk. At 300' above the DH (600' above airport), we spotted a green v-tail cross from left to right at our altitude circling for the airport. An evasive action was taken. Distance was approximately 1/2 mi. We continued our approach and landed west/O incident. The other aircraft continued circling west/O announcing intentions over the CTAF. When he realized that we were there, he departed the area in the clouds. Asking grissom approach if he had the other aircraft on radar, the reply was, 'no.' we were unable to talk to the other pilot about the incident. I called the FBO to see if they knew who he was. It sounded as if they were covering for him. This is probably a common thing for uncontrolled airports, so it's difficult to recommend a new procedure. The pilot was legal (1 mi visibility, clear of clouds) in uncontrolled airspace. I believe he was shooting the VOR 3L approach under VFR rules in IFR conditions, broke out and saw the runway, and after hearing and seeing us he thought he was in trouble and departed the airspace illegally.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT AT A NON TWR ARPT CTAF.

Narrative: AT APPROX PM00 LCL TIME, WE WERE DSNDING ON THE G/S OF THE ILS 23 AT OKK. AT 300' ABOVE THE DH (600' ABOVE ARPT), WE SPOTTED A GREEN V-TAIL CROSS FROM LEFT TO RIGHT AT OUR ALT CIRCLING FOR THE ARPT. AN EVASIVE ACTION WAS TAKEN. DISTANCE WAS APPROX 1/2 MI. WE CONTINUED OUR APCH AND LANDED W/O INCIDENT. THE OTHER ACFT CONTINUED CIRCLING W/O ANNOUNCING INTENTIONS OVER THE CTAF. WHEN HE REALIZED THAT WE WERE THERE, HE DEPARTED THE AREA IN THE CLOUDS. ASKING GRISSOM APCH IF HE HAD THE OTHER ACFT ON RADAR, THE REPLY WAS, 'NO.' WE WERE UNABLE TO TALK TO THE OTHER PLT ABOUT THE INCIDENT. I CALLED THE FBO TO SEE IF THEY KNEW WHO HE WAS. IT SOUNDED AS IF THEY WERE COVERING FOR HIM. THIS IS PROBABLY A COMMON THING FOR UNCTLED ARPTS, SO IT'S DIFFICULT TO RECOMMEND A NEW PROC. THE PLT WAS LEGAL (1 MI VISIBILITY, CLR OF CLOUDS) IN UNCTLED AIRSPACE. I BELIEVE HE WAS SHOOTING THE VOR 3L APCH UNDER VFR RULES IN IFR CONDITIONS, BROKE OUT AND SAW THE RWY, AND AFTER HEARING AND SEEING US HE THOUGHT HE WAS IN TROUBLE AND DEPARTED THE AIRSPACE ILLEGALLY.

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.