Narrative:

During a routine helicopter tour from ZZZ to the ZZZ1; a large military fixed-wing aircraft flew nearly directly under our helicopter from left to right. The other aircraft was not on the appropriate advisory frequency and was traveling at a high speed quite low to the ground. Visual contact with the aircraft was not made until the passenger in the right aft seat alerted me of the aircraft as it passed off our 4 O'clock position. Upon the near-miss situation; I communicated with the other helicopter tour operators in the area; and we warned each other that there was an off-frequency military aircraft operating fast and low to the ground moving northbound. Another tour pilot saw the military aircraft and switched over to approach control to inquire whether this military plane was on the approach control frequency; but he was reportedly not at the time. Upon finishing out the tour in the area; I switched over to approach control on the way back to ZZZ and asked them if the military aircraft was still operating in the area or whether it had passed through their airspace. The controller notified me that the military aircraft had transitioned through the airspace; and that he gave the pilot of that aircraft an earful for his transgression.on my end; this will serve as a reminder to be vigilant in constantly scanning for aircraft and rely on radio call position reports only as a back-up for traffic avoidance; especially in class G and class east airspace.

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Original NASA ASRS Text

Title: A helicopter pilot reported a near miss with a large military transport. The military plane was flying low; fast; and not communicating on any of the customary frequencies used in the area.

Narrative: During a routine helicopter tour from ZZZ to the ZZZ1; a large military fixed-wing aircraft flew nearly directly under our helicopter from left to right. The other aircraft was not on the appropriate advisory frequency and was traveling at a high speed quite low to the ground. Visual contact with the aircraft was not made until the passenger in the right aft seat alerted me of the aircraft as it passed off our 4 O'clock position. Upon the near-miss situation; I communicated with the other helicopter tour operators in the area; and we warned each other that there was an off-frequency military aircraft operating fast and low to the ground moving northbound. Another tour pilot saw the military aircraft and switched over to Approach Control to inquire whether this military plane was on the Approach Control frequency; but he was reportedly not at the time. Upon finishing out the tour in the area; I switched over to Approach Control on the way back to ZZZ and asked them if the military aircraft was still operating in the area or whether it had passed through their airspace. The controller notified me that the military aircraft had transitioned through the airspace; and that he gave the pilot of that aircraft an earful for his transgression.On my end; this will serve as a reminder to be vigilant in constantly scanning for aircraft and rely on radio call position reports only as a back-up for traffic avoidance; especially in Class G and Class E airspace.

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.