Narrative:

Cessna 172 made CTAF 122.8 VHF radio call to enter runway 33 for takeoff. Cessna 172 paused on runway as student prepared to add takeoff power. A helicopter operating on the east ramp made a direct west takeoff call. Cessna 172 immediately queried helicopter who then answered that he would hold position for cessna. Cessna 172 added power for takeoff roll; at approximately 1;000-1;250 feet on takeoff roll instructor glanced down for instrument check and verify maximum power was set and flying speed attained. Student pilot began to rotate with instructor in backup position. Instructor noticed jet aircraft rapidly approaching in the opposite direction (runway 15) on its takeoff roll at just past rotation in a moderate angle of attack (aoa) takeoff. Cessna 172 instructor immediately pushed nose over for evasive action and added slight left angle of bank (aob) for lateral clearance. Estimated about 50 feet vertical as aircraft passed above and just right of the cessna. Cessna 172 called on CTAF 122.8 to aircraft to identify with negative response. Cessna 172 queried helicopter if the jet was working with his photo group and for call sign but was not successful in communicating with departing jet. Communications were never established with the jet on inyokern CTAF or on joshua approach. The jet was not on proper CTAF frequency; or was on frequency and did not make any radio calls. Runway end is not clearly visible during dusk conditions from the approach end.

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Original NASA ASRS Text

Title: C172 instructor pilot departing Runway 33 at IYK reports a NMAC with a departing jet on Runway 33. Evasive action is taken by the C172 instructor; at low altitude near midfield. CTAF procedures were in use and the reporter had communicated with a helicopter planning a departure but the jet pilot was apparently never on the CTAF.

Narrative: Cessna 172 made CTAF 122.8 VHF radio call to enter Runway 33 for takeoff. Cessna 172 paused on runway as student prepared to add takeoff power. A helicopter operating on the east ramp made a direct west takeoff call. Cessna 172 immediately queried helicopter who then answered that he would hold position for Cessna. Cessna 172 added power for takeoff roll; at approximately 1;000-1;250 feet on takeoff roll instructor glanced down for instrument check and verify maximum power was set and flying speed attained. Student pilot began to rotate with instructor in backup position. Instructor noticed jet aircraft rapidly approaching in the opposite direction (Runway 15) on its takeoff roll at just past rotation in a moderate Angle of Attack (AOA) takeoff. Cessna 172 instructor immediately pushed nose over for evasive action and added slight left Angle of Bank (AOB) for lateral clearance. Estimated about 50 feet vertical as aircraft passed above and just right of the Cessna. Cessna 172 called on CTAF 122.8 to aircraft to identify with negative response. Cessna 172 queried helicopter if the jet was working with his photo group and for call sign but was not successful in communicating with departing jet. Communications were never established with the jet on Inyokern CTAF or on Joshua Approach. The jet was not on proper CTAF frequency; or was on frequency and did not make any radio calls. Runway end is not clearly visible during dusk conditions from the approach end.

Data retrieved from NASA's ASRS site 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.