Aircraft Settles on Runway After Cabin Window Opens During Climb (N18307)

What happened

Immediately after gear retraction during the initial climb phase of takeoff, the right center cabin window unexpectedly opened. The sudden increase in ambient noise diverted the pilot's attention away from flight instruments to his daughter, who was seated adjacent to the affected window. While attempting to secure the window, the pilot failed to maintain a positive climb rate. Consequently, the aircraft settled back onto the runway surface.

Findings

The primary factor contributing to the incident was the pilot's loss of situational awareness regarding altitude due to distraction caused by the open window and passenger reaction.