B737 first officer reported encountering wake turbulence from the preceding air carrier departing la...

Attributes
ACN	1432706
Time
Date	201703
Local Time Of Day	0601-1200
Place
Locale Reference	LAS.Airport
State Reference	NV
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	SID TRALR 7
Flight Plan	IFR
Aircraft 2
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	SID TRALR 7
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 181
Events
Anomaly	Conflict Airborne Conflict Deviation - Track / Heading All Types Inflight Event / Encounter Wake Vortex Encounter

Narrative:

We departed las climbing LNAV/VNAV on the tralr 7 departure behind another carrier's aircraft. We were in compliance with the SID speed and altitudes. We encountered wake turbulence at 8000 ft. We noticed then that we were just under five miles in trail with a rapid closure rate. We were visually closing faster than I was comfortable so I told the captain I was commencing a right turn off course for traffic avoidance and to advise departure control. Just after beginning the turn we received a TCAS RA and I disconnected the autopilot to comply. ATC told us to turn left but in our judgment that would have put us in jeopardy of collision with [the other] aircraft so I continued a right hand turn. After we; and ATC; regained separation; I reengaged the autopilot. We were then given vectors on course. After separation and resuming on course; ATC asked [the preceding flight] why they were at such a slow speed. They replied that they had slowed to make an altitude restriction. Also; no TCAS TA preceded the RA.

Original NASA ASRS Text

Title: B737 First Officer reported encountering wake turbulence from the preceding air carrier departing LAS when the preceding flight slowed to make a climb restriction.

Narrative: We departed LAS climbing LNAV/VNAV on the TRALR 7 Departure behind another carrier's aircraft. We were in compliance with the SID speed and altitudes. We encountered wake turbulence at 8000 ft. We noticed then that we were just under five miles in trail with a rapid closure rate. We were visually closing faster than I was comfortable so I told the Captain I was commencing a right turn off course for traffic avoidance and to advise Departure Control. Just after beginning the turn we received a TCAS RA and I disconnected the autopilot to comply. ATC told us to turn left but in our judgment that would have put us in jeopardy of collision with [the other] aircraft so I continued a right hand turn. After we; and ATC; regained separation; I reengaged the autopilot. We were then given vectors on course. After separation and resuming on course; ATC asked [the preceding flight] why they were at such a slow speed. They replied that they had slowed to make an altitude restriction. Also; no TCAS TA preceded the RA.

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.

B737 first officer reported encountering wake turbulence from the preceding air carrier departing las when the preceding flight slowed to make a climb restriction.