Narrative:

The flight began departing montgomery field municipal airport runway 28R departing westbound on a heading of approximately 270 with a beginning student pilot on a flight training lesson. Myf tower gave a frequency change approval approximately 2-3 NM west of the airport. I then changed to the air-to-air frequency of 122.75 that is the main frequency used in the san diego area for collision avoidance. At an altitude of what I believe to be at 2;000 ft; 5 NM west of montgomery; the tcad on a garmin G1000 showed an aircraft coming 3 NM from the northwest at 300 ft above my current elevation. I then took over the controls from the student and proceeded to continue scanning outside for traffic and monitoring the ground track of the other aircraft. I then decided to stop my climb out and prepared for a decent for the best evasive action due to the fact that my slow climb out speed of 80 KTS would not produce enough energy to avoid the collision threat in time during a right turn. After spotting the traffic at approximately 1 nm away on a head on course I proceeded to pull power to idle and began a 2;000 ft/min plus dive which evaded the aircraft at approximately 400 ft below the other aircraft.

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Original NASA ASRS Text

Title: C172 Instructor with student and a C182 pilot experience a NMAC at 2;500 FT west of MYF.

Narrative: The flight began departing Montgomery Field Municipal airport Runway 28R departing westbound on a heading of approximately 270 with a beginning student pilot on a flight training lesson. MYF Tower gave a frequency change approval approximately 2-3 NM west of the airport. I then changed to the air-to-air frequency of 122.75 that is the main frequency used in the San Diego area for collision avoidance. At an altitude of what I believe to be at 2;000 FT; 5 NM west of Montgomery; the TCAD on a Garmin G1000 showed an aircraft coming 3 NM from the northwest at 300 FT above my current elevation. I then took over the controls from the student and proceeded to continue scanning outside for traffic and monitoring the ground track of the other aircraft. I then decided to stop my climb out and prepared for a decent for the best evasive action due to the fact that my slow climb out speed of 80 KTS would not produce enough energy to avoid the collision threat in time during a right turn. After spotting the traffic at approximately 1 nm away on a head on course I proceeded to pull power to idle and began a 2;000 FT/min plus dive which evaded the aircraft at approximately 400 FT below the other aircraft.

Data retrieved from NASA's ASRS site as of April 2012 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.