Check pilot reported a near midair collision during takeoff from a non-towered airport.

Attributes
ACN	1530826
Time
Date	201803
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Baron 58/58TC
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Route In Use	None
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Route In Use	None
Flight Plan	None
Person 1
Function	Check Pilot Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 20000 Flight Crew Type 300
Events
Anomaly	Conflict NMAC Deviation - Procedural Published Material / Policy
Miss Distance	Horizontal 200 Vertical 50

Narrative:

I was conducting a multi-engine flight test. AWOS indicated wind was calm. Applicant decided to taxi to runway 06 for departure. Unknown to us aircraft Y with no radio taxied to runway 24 for departure. The ramp and taxiway to 24 were behind us as we taxied toward runway 06.after completing runup; the applicant made the normal CTAF announcements indicating we intended to depart runway 06. Neither the applicant nor I observed any traffic during takeoff or climb.we were later informed that aircraft Y was departing at the same time on runway 24 and that we almost collided over the runway. I do not know if aircraft Y saw us or took evasive action. Because of the slope of the runway; it would not have been possible for either plane to see the other until after takeoff. This could have been a very serious accident and could have been avoided if aircraft Y had been radio equipped.while a calm wind is good for flying; it was a set up for this close call.

Original NASA ASRS Text

Title: Check pilot reported a NMAC during takeoff from a non-towered airport.

Narrative: I was conducting a multi-engine flight test. AWOS indicated wind was calm. Applicant decided to taxi to runway 06 for departure. Unknown to us Aircraft Y with no radio taxied to runway 24 for departure. The ramp and taxiway to 24 were behind us as we taxied toward runway 06.After completing runup; the applicant made the normal CTAF announcements indicating we intended to depart runway 06. Neither the applicant nor I observed any traffic during takeoff or climb.We were later informed that Aircraft Y was departing at the same time on runway 24 and that we almost collided over the runway. I do not know if Aircraft Y saw us or took evasive action. Because of the slope of the runway; it would not have been possible for either plane to see the other until after takeoff. This could have been a very serious accident and could have been avoided if Aircraft Y had been radio equipped.While a calm wind is good for flying; it was a set up for this close call.

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.