Small Aircraft; Low Wing; 1 Eng; Fixed Gear
Flight Crew Commercial; Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor
Flight Crew Last 90 Days 25; Flight Crew Total 3300; Flight Crew Type 1650
Confusion; Situational Awareness; Communication Breakdown; Training / Qualification
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Became Reoriented
Human Factors; Procedure
Preparing to depart from Runway 01; I had checked the AWOS and had reset my local airport UNICOM frequency and had monitored the frequency taxiing to the departure runway. After run-up; I announced my intentions to depart [Runway] 01. At about 400 FT AGL and 3/4 way down the runway; I noted that there was a plane that had begun its takeoff run for Runway 19. I called the aircraft on the advisory frequency with out response and switched to Approach Control. It was at this time that I noticed that the frequency that I had selected was XXX.025 rather than XXX.05. I will NEVER make that mistake again!
A pilot taxied and departed Runway 1 using proper CTAF communications procedures but on the incorrect frequency and had a near miss with an aircraft landing on Runway 19.