<< >> NASA ASRS Report 1323633, January 2016

B737-800 flight crew reported being cleared for takeoff behind a B757 without wake turbulence separation. The tower is queried and states that the separation standards have been changed. The flight manual for the company involved does not reflect those changes.

Attributes
ACN	1323633
Time
Date	201601
Local Time Of Day	0601-1200
Place
Locale Reference	LAS.Airport
State Reference	NV
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types

Narrative:

Cleared for takeoff right behind B757 by las tower. Informed las tower we need wake turbulence separation behind 757 (per flight manual) and tower controller states 'there is no separation behind 757; if you wanted separation you should have told me before taking the runway'. We created our own separation for a very minimum four miles. Takeoff uneventful.

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Original NASA ASRS Text

Title: B737-800 flight crew reported being cleared for takeoff behind a B757 without wake turbulence separation. The Tower is queried and states that the separation standards have been changed. The Flight Manual for the company involved does not reflect those changes.

Narrative: Cleared for takeoff right behind B757 by LAS tower. Informed LAS tower we need wake turbulence separation behind 757 (per Flight Manual) and tower controller states 'there is no separation behind 757; if you wanted separation you should have told me before taking the runway'. We created our own separation for a very minimum four miles. Takeoff uneventful.

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.