Narrative:

Aircraft #1 approached the goshen, in, airport on an IFR flight plan in VMC. On establishing visual contact with the airport, the IFR flight plan was cancelled with ATC and the aircraft proceeded to enter the traffic pattern, making position announcements on the CTAF. Another aircraft (a cessna 172), not involved in this incident, acknowledged establishing visual contact with aircraft #1 and vice versa. Aircraft #1, after ensuring adequate spacing from the cessna, turned base and subsequently final. At about 150-200 ft AGL and approximately 0.5 NM from the runway threshold, the pilot of aircraft #1 heard a loud engine noise from the right side of the airplane and looked in that direction, just in time to see an experimental aircraft pull away into a climbing right turn not more than 20 ft from aircraft #1 -- close enough to clearly see the rivets. Aircraft #1 landed, parked close to the C172 and in a conversation with the pilot of that airplane it was determined that neither of us had heard any position announcements from the pilot of aircraft #2. Presently the pilot of aircraft #2 landed, parked and walked over. The pilot of aircraft #1 remarked to him that he seemed to have 'come out of the blue' and that he should have made position announcements, at which point he stated that he was indeed doing so. The pilot of the cessna and that of aircraft #1 both stated that neither had heard any of his announcements, at which he reiterated that he had made all position announcements. At this point, the pilot of aircraft #1 remarked that he must have been using the wrong frequency. The pilot of aircraft #2 then said that he was making all announcements on a frequency of 123.0 MHZ. Both the other pilots stated that that was the wrong frequency and that he should have been using 123.05. He stated that it was the correct frequency and, from his aircraft, produced a state aeronautical chart, clearly marked 'not for navigation -- with 123.0 as the CTAF frequency.' the pilot of the cessna and that of aircraft #1 pointed that out to the pilot of aircraft #2, at which point he stood silent, with a rather sheepish look on his face.

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Original NASA ASRS Text

Title: PLT OF PA28 ENCOUNTERED AN NMAC WITH EXPERIMENTAL ACFT ON FINAL APCH TO GSH. PLT OF EXPERIMENTAL ACFT WAS USING INCORRECT CTAF FREQ FOR POS XMISSIONS.

Narrative: ACFT #1 APCHED THE GOSHEN, IN, ARPT ON AN IFR FLT PLAN IN VMC. ON ESTABLISHING VISUAL CONTACT WITH THE ARPT, THE IFR FLT PLAN WAS CANCELLED WITH ATC AND THE ACFT PROCEEDED TO ENTER THE TFC PATTERN, MAKING POS ANNOUNCEMENTS ON THE CTAF. ANOTHER ACFT (A CESSNA 172), NOT INVOLVED IN THIS INCIDENT, ACKNOWLEDGED ESTABLISHING VISUAL CONTACT WITH ACFT #1 AND VICE VERSA. ACFT #1, AFTER ENSURING ADEQUATE SPACING FROM THE CESSNA, TURNED BASE AND SUBSEQUENTLY FINAL. AT ABOUT 150-200 FT AGL AND APPROX 0.5 NM FROM THE RWY THRESHOLD, THE PLT OF ACFT #1 HEARD A LOUD ENG NOISE FROM THE R SIDE OF THE AIRPLANE AND LOOKED IN THAT DIRECTION, JUST IN TIME TO SEE AN EXPERIMENTAL ACFT PULL AWAY INTO A CLBING R TURN NOT MORE THAN 20 FT FROM ACFT #1 -- CLOSE ENOUGH TO CLRLY SEE THE RIVETS. ACFT #1 LANDED, PARKED CLOSE TO THE C172 AND IN A CONVERSATION WITH THE PLT OF THAT AIRPLANE IT WAS DETERMINED THAT NEITHER OF US HAD HEARD ANY POS ANNOUNCEMENTS FROM THE PLT OF ACFT #2. PRESENTLY THE PLT OF ACFT #2 LANDED, PARKED AND WALKED OVER. THE PLT OF ACFT #1 REMARKED TO HIM THAT HE SEEMED TO HAVE 'COME OUT OF THE BLUE' AND THAT HE SHOULD HAVE MADE POS ANNOUNCEMENTS, AT WHICH POINT HE STATED THAT HE WAS INDEED DOING SO. THE PLT OF THE CESSNA AND THAT OF ACFT #1 BOTH STATED THAT NEITHER HAD HEARD ANY OF HIS ANNOUNCEMENTS, AT WHICH HE REITERATED THAT HE HAD MADE ALL POS ANNOUNCEMENTS. AT THIS POINT, THE PLT OF ACFT #1 REMARKED THAT HE MUST HAVE BEEN USING THE WRONG FREQ. THE PLT OF ACFT #2 THEN SAID THAT HE WAS MAKING ALL ANNOUNCEMENTS ON A FREQ OF 123.0 MHZ. BOTH THE OTHER PLTS STATED THAT THAT WAS THE WRONG FREQ AND THAT HE SHOULD HAVE BEEN USING 123.05. HE STATED THAT IT WAS THE CORRECT FREQ AND, FROM HIS ACFT, PRODUCED A STATE AERONAUTICAL CHART, CLRLY MARKED 'NOT FOR NAV -- WITH 123.0 AS THE CTAF FREQ.' THE PLT OF THE CESSNA AND THAT OF ACFT #1 POINTED THAT OUT TO THE PLT OF ACFT #2, AT WHICH POINT HE STOOD SILENT, WITH A RATHER SHEEPISH LOOK ON HIS FACE.

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.