2025-09 · NASA ASRS report 2291062
B737 flight crew reported encountering wake turbulence soon after lift off; over-banking the aircraft's SOP limits and receiving a late call from ATC regarding conflicting traffic.
We were given clearance to take off Runway 1L and climb via the RADYR2 Departure. This departure requires a significant turn over the Las Vegas strip; to achieve a greater than 135 degree course change. We departed at night; and upon the initiation of our turn at approximately 500 AGL; we encountered significant but short-lived wake turbulence that rolled the aircraft momentarily to approximately 45 degree left bank. As I adjusted the controls to bring us back to a more appropriate and moderate bank angle; ATC notified us that there was helicopter traffic within 200-300 feet of us; over the strip. The FO (First Officer) did not have visual contact. At about the same time; we received a TCAS Traffic Advisory; further alerting us of the nearby helicopter. I glanced at the ND (Navigation Display); and identified that the contact for this traffic was 300' below us and climbing; and approximately 2 miles to our 2 o'clock and flying on a converging course with us. I increased my turn to continue turning away from this traffic; while simultaneously increasing pitch in order to accelerate our climb. This enabled us to clear the incoming course of the other aircraft; although the bank angle increased momentarily beyond 30 degrees. The FO stated 'bank angle' and almost immediately the aircraft announced the same. I reduced the turn to below 30 degrees and we were able to continue with no further incident.
While on initial takeoff from Runway 1R in Las Vegas on the RADYR 2 departure ATC notified [us] of helicopter traffic near our vicinity within 200-300 feet. This was immediately followed by an aircraft TA and confirmed visually on the display unit. During this time we had begun the initial turnout per the departure; a fairly large turn immediately after takeoff. Due to the proximity of the traffic and unable to pick up the traffic visually; the PF turned slightly quicker to ensure safe clearance from the traffic. The bank angle approached 30 degrees and as it slightly passed through 30 the PM announced 'bank angle' and the aircraft also announced 'bank angle'. The maximum bank angle was 35 degrees and the alert system briefly showed in 'amber'. The PF immediately reduced bank to 30 degrees and continued the departure. The traffic was never picked up visually and an RA was never commanded.Las Vegas departure off 1R on the RADYR 2 departure. Approximately 600 feet AGL left turn on departure from initial takeoff.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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