Narrative:

I was flying a C-182 with two others on an orientation ride. We announced our intentions to depart runway 5 to the northeast on CTAF. We took the runway and; as we accelerated to rotation speed; spotted a piper saratoga coming at us head-on; approximately 1;000 ft in front; and closing. We aborted our takeoff; moved from centerline to the right side of the runway; braked and stopped prior to the saratoga passing. Saratoga also saw us; and we had plenty of room to pass each other on the runway; both airplanes stopped or slowed significantly. I called him on CTAF and; after a few seconds; he answered and asked us if we heard his transmission before his takeoff. We did not. We inquired about CTAF and he stated he called on the unicom frequency; that the CTAF frequency was being utilized by anderson radio; and that the unicom should be used. He told us to check the facilities directory to find the correct frequency to use (referring to unicom). We subsequently departed and monitored 123.6; and he then switched over to 123.6. A contributing factor was that anderson radio was talking on 122.0 or 122.2 to other aircraft in the air; but was also broadcasting on 123.6. This took quite a bit of time out of the CTAF frequency and I believe this confused the saratoga pilot; causing him to utilize the unicom frequency to broadcast his takeoff intentions. We both saw each other prior to rotation and a near miss/collision was avoided. My two passengers were concerned; but not fearful; as we avoided an incident.

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Original NASA ASRS Text

Title: A C-182 and a Piper Saratoga; departing AND on the same uncontrolled runway but in opposite directions rejected their takeoffs to avoid a collision. They later determined one was transmitting intentions on the published CTAF frequency and the other on the published Unicom frequency.

Narrative: I was flying a C-182 with two others on an Orientation Ride. We announced our intentions to depart Runway 5 to the northeast on CTAF. We took the runway and; as we accelerated to rotation speed; spotted a Piper Saratoga coming at us head-on; approximately 1;000 FT in front; and closing. We aborted our takeoff; moved from centerline to the right side of the runway; braked and stopped prior to the Saratoga passing. Saratoga also saw us; and we had plenty of room to pass each other on the runway; both airplanes stopped or slowed significantly. I called him on CTAF and; after a few seconds; he answered and asked us if we heard his transmission before his takeoff. We did not. We inquired about CTAF and he stated he called on the Unicom frequency; that the CTAF frequency was being utilized by Anderson Radio; and that the Unicom should be used. He told us to check the facilities directory to find the correct frequency to use (referring to Unicom). We subsequently departed and monitored 123.6; and he then switched over to 123.6. A contributing factor was that Anderson Radio was talking on 122.0 or 122.2 to other aircraft in the air; but was also broadcasting on 123.6. This took quite a bit of time out of the CTAF frequency and I believe this confused the Saratoga pilot; causing him to utilize the Unicom frequency to broadcast his takeoff intentions. We both saw each other prior to rotation and a near miss/collision was avoided. My two passengers were concerned; but not fearful; as we avoided an incident.

Data retrieved from NASA's ASRS site as of July 2013 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.